about summary refs log tree commit diff
path: root/tools/cheddar
diff options
context:
space:
mode:
Diffstat (limited to 'tools/cheddar')
-rw-r--r--tools/cheddar/.gitignore1
-rw-r--r--tools/cheddar/.skip-subtree0
-rw-r--r--tools/cheddar/Cargo.lock1207
-rw-r--r--tools/cheddar/Cargo.toml18
-rw-r--r--tools/cheddar/README.md21
-rw-r--r--tools/cheddar/build.rs50
-rw-r--r--tools/cheddar/default.nix12
-rw-r--r--tools/cheddar/src/bin/cheddar.rs135
-rw-r--r--tools/cheddar/src/lib.rs337
-rw-r--r--tools/cheddar/src/tests.rs97
10 files changed, 1878 insertions, 0 deletions
diff --git a/tools/cheddar/.gitignore b/tools/cheddar/.gitignore
new file mode 100644
index 000000000000..2f7896d1d136
--- /dev/null
+++ b/tools/cheddar/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/tools/cheddar/.skip-subtree b/tools/cheddar/.skip-subtree
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/tools/cheddar/.skip-subtree
diff --git a/tools/cheddar/Cargo.lock b/tools/cheddar/Cargo.lock
new file mode 100644
index 000000000000..0635209a1d0a
--- /dev/null
+++ b/tools/cheddar/Cargo.lock
@@ -0,0 +1,1207 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "adler32"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
+[[package]]
+name = "ascii"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbf56136a5198c7b01a49e3afcbef6cf84597273d298f54432926024107b0109"
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
+[[package]]
+name = "bincode"
+version = "1.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1f45e9417d87227c7a56d22e471c6206462cba514c7590c09aff4cf6d1ddcad"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "blake2b_simd"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afa748e348ad3be8263be728124b24a24f268266f6f5d58af9d75f6a40b5c587"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "constant_time_eq",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
+dependencies = [
+ "block-padding",
+ "byte-tools",
+ "byteorder",
+ "generic-array",
+]
+
+[[package]]
+name = "block-padding"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
+dependencies = [
+ "byte-tools",
+]
+
+[[package]]
+name = "brotli-sys"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4445dea95f4c2b41cde57cc9fee236ae4dbae88d8fcbdb4750fc1bb5d86aaecd"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "brotli2"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0cb036c3eade309815c15ddbacec5b22c4d1f3983a774ab2eac2e3e9ea85568e"
+dependencies = [
+ "brotli-sys",
+ "libc",
+]
+
+[[package]]
+name = "buf_redux"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b953a6887648bb07a535631f2bc00fbdb2a2216f135552cb3f534ed136b9c07f"
+dependencies = [
+ "memchr",
+ "safemem",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "cc"
+version = "1.0.71"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79c2681d6594606957bbb8631c4b90a7fcaaa72cdb714743a437b156d6a7eedd"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "cheddar"
+version = "0.2.0"
+dependencies = [
+ "clap",
+ "comrak",
+ "lazy_static",
+ "regex",
+ "rouille",
+ "serde",
+ "serde_json",
+ "syntect",
+]
+
+[[package]]
+name = "chrono"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "time 0.1.43",
+ "winapi",
+]
+
+[[package]]
+name = "chunked_transfer"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"
+
+[[package]]
+name = "clap"
+version = "2.33.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
+[[package]]
+name = "comrak"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b423acba50d5016684beaf643f9991e622633a4c858be6885653071c2da2b0c6"
+dependencies = [
+ "clap",
+ "entities",
+ "lazy_static",
+ "pest",
+ "pest_derive",
+ "regex",
+ "shell-words",
+ "twoway 0.2.2",
+ "typed-arena",
+ "unicode_categories",
+ "xdg",
+]
+
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+
+[[package]]
+name = "crc32fast"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81156fece84ab6a9f2afdb109ce3ae577e42b1228441eded99bd77f627953b1a"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d82cfc11ce7f2c3faef78d8a684447b40d503d9681acebed6cb728d45940c4db"
+dependencies = [
+ "cfg-if",
+ "lazy_static",
+]
+
+[[package]]
+name = "deflate"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f95bf05dffba6e6cce8dfbb30def788154949ccd9aed761b472119c21e01c70"
+dependencies = [
+ "adler32",
+ "gzip-header",
+]
+
+[[package]]
+name = "digest"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "dirs"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fd78930633bd1c6e35c4b42b1df7b0cbc6bc191146e512bb3bedf243fcc3901"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
+[[package]]
+name = "entities"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5320ae4c3782150d900b79807611a59a99fc9a1d61d686faafc24b93fc8d7ca"
+
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
+
+[[package]]
+name = "filetime"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "975ccf83d8d9d0d84682850a38c8169027be83368805971cc4f238c2b245bc98"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall 0.2.10",
+ "winapi",
+]
+
+[[package]]
+name = "flate2"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e6988e897c1c9c485f43b47a529cef42fde0547f9d8d41a7062518f1d8fc53f"
+dependencies = [
+ "cfg-if",
+ "crc32fast",
+ "libc",
+ "miniz_oxide",
+]
+
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
+dependencies = [
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
+name = "generic-array"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffdf9f34f1447443d37393cc6c2b8313aebddcd96906caf34e54c68d8e57d7bd"
+dependencies = [
+ "typenum",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi 0.10.2+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "gzip-header"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0131feb3d3bb2a5a238d8a4d09f6353b7ebfdc52e77bccbf4ea6eaa751dde639"
+dependencies = [
+ "crc32fast",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "httparse"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acd94fdbe1d4ff688b67b04eee2e17bd50995534a61539e45adfefb45e5e5503"
+
+[[package]]
+name = "idna"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
+[[package]]
+name = "indexmap"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc633605454125dec4b66843673f01c7df2b89479b32e0ed634e43a91cff62a5"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
+[[package]]
+name = "itoa"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b71991ff56294aa922b450139ee08b3bfc70982c6b2c7562771375cf73542dd4"
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "lazycell"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
+
+[[package]]
+name = "libc"
+version = "0.2.103"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd8f7255a17a627354f321ef0055d63b898c6fb27eff628af4d1b66b7331edf6"
+
+[[package]]
+name = "line-wrap"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f30344350a2a51da54c1d53be93fade8a237e545dbcc4bdbe635413f2117cab9"
+dependencies = [
+ "safemem",
+]
+
+[[package]]
+name = "linked-hash-map"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
+
+[[package]]
+name = "log"
+version = "0.4.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "maplit"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
+
+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
+[[package]]
+name = "memchr"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
+[[package]]
+name = "mime"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
+
+[[package]]
+name = "mime_guess"
+version = "2.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2684d4c2e97d99848d30b324b00c8fcc7e5c897b7cbb5819b09e7c90e8baf212"
+dependencies = [
+ "mime",
+ "unicase",
+]
+
+[[package]]
+name = "miniz_oxide"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
+dependencies = [
+ "adler",
+ "autocfg",
+]
+
+[[package]]
+name = "multipart"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00dec633863867f29cb39df64a397cdf4a6354708ddd7759f70c7fb51c5f9182"
+dependencies = [
+ "buf_redux",
+ "httparse",
+ "log",
+ "mime",
+ "mime_guess",
+ "quick-error",
+ "rand",
+ "safemem",
+ "tempfile",
+ "twoway 0.1.8",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "num_cpus"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
+dependencies = [
+ "hermit-abi",
+ "libc",
+]
+
+[[package]]
+name = "onig"
+version = "6.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b17403cf40f61e3ee059e3e90b7fc0a2953297168d4379b160f80d18fed848a4"
+dependencies = [
+ "bitflags",
+ "lazy_static",
+ "libc",
+ "onig_sys",
+]
+
+[[package]]
+name = "onig_sys"
+version = "69.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5dd3eee045c84695b53b20255bb7317063df090b68e18bfac0abb6c39cf7f33e"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
+
+[[package]]
+name = "opaque-debug"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
+
+[[package]]
+name = "percent-encoding"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
+
+[[package]]
+name = "pest"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
+dependencies = [
+ "ucd-trie",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "833d1ae558dc601e9a60366421196a8d94bc0ac980476d0b67e1d0988d72b2d0"
+dependencies = [
+ "pest",
+ "pest_generator",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99b8db626e31e5b81787b9783425769681b347011cc59471e33ea46d2ea0cf55"
+dependencies = [
+ "pest",
+ "pest_meta",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54be6e404f5317079812fc8f9f5279de376d8856929e21c184ecf6bbd692a11d"
+dependencies = [
+ "maplit",
+ "pest",
+ "sha-1",
+]
+
+[[package]]
+name = "pkg-config"
+version = "0.3.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c9b1041b4387893b91ee6746cddfc28516aff326a3519fb2adf820932c5e6cb"
+
+[[package]]
+name = "plist"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a38d026d73eeaf2ade76309d0c65db5a35ecf649e3cec428db316243ea9d6711"
+dependencies = [
+ "base64",
+ "chrono",
+ "indexmap",
+ "line-wrap",
+ "serde",
+ "xml-rs",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9f5105d4fdaab20335ca9565e106a5d9b82b6219b5ba735731124ac6711d23d"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quick-error"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
+
+[[package]]
+name = "quote"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
+dependencies = [
+ "getrandom 0.2.3",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "redox_syscall"
+version = "0.1.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
+
+[[package]]
+name = "redox_syscall"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8383f39639269cde97d255a32bdb68c047337295414940c68bdd30c2e13203ff"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "redox_users"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de0737333e7a9502c789a36d7c7fa6092a49895d4faa31ca5df163857ded2e9d"
+dependencies = [
+ "getrandom 0.1.16",
+ "redox_syscall 0.1.57",
+ "rust-argon2",
+]
+
+[[package]]
+name = "regex"
+version = "1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
+[[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "rouille"
+version = "3.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfc1bcf3b32bd9ef568402e750404c369ff172a6a34597c858f8ccf5f3bed013"
+dependencies = [
+ "base64",
+ "brotli2",
+ "chrono",
+ "deflate",
+ "filetime",
+ "multipart",
+ "num_cpus",
+ "percent-encoding",
+ "rand",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "sha1",
+ "threadpool",
+ "time 0.3.3",
+ "tiny_http",
+ "url",
+]
+
+[[package]]
+name = "rust-argon2"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b18820d944b33caa75a71378964ac46f58517c92b6ae5f762636247c09e78fb"
+dependencies = [
+ "base64",
+ "blake2b_simd",
+ "constant_time_eq",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
+
+[[package]]
+name = "safemem"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
+
+[[package]]
+name = "same-file"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "serde"
+version = "1.0.130"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f12d06de37cf59146fbdecab66aa99f9fe4f78722e3607577a5375d66bd0c913"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.130"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7bc1a1ab1961464eae040d96713baa5a724a8152c1222492465b54322ec508b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f690853975602e1bfe1ccbf50504d67174e3bcf340f23b5ea9992e0587a52d8"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "sha-1"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7d94d0bede923b3cea61f3f1ff57ff8cdfd77b400fb8f9998949e0cf04163df"
+dependencies = [
+ "block-buffer",
+ "digest",
+ "fake-simd",
+ "opaque-debug",
+]
+
+[[package]]
+name = "sha1"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
+
+[[package]]
+name = "shell-words"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6fa3938c99da4914afedd13bf3d79bcb6c277d1b2c398d23257a304d9e1b074"
+
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
+[[package]]
+name = "syn"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d010a1623fbd906d51d650a9916aaefc05ffa0e4053ff7fe601167f3e715d194"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "syntect"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b20815bbe80ee0be06e6957450a841185fcf690fe0178f14d77a05ce2caa031"
+dependencies = [
+ "bincode",
+ "bitflags",
+ "flate2",
+ "fnv",
+ "lazy_static",
+ "lazycell",
+ "onig",
+ "plist",
+ "regex-syntax",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "walkdir",
+ "yaml-rust",
+]
+
+[[package]]
+name = "tempfile"
+version = "3.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dac1c663cfc93810f88aed9b8941d48cabf856a1b111c29a40439018d870eb22"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "rand",
+ "redox_syscall 0.2.10",
+ "remove_dir_all",
+ "winapi",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
+
+[[package]]
+name = "threadpool"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d050e60b33d41c19108b32cea32164033a9013fe3b46cbd4457559bfbf77afaa"
+dependencies = [
+ "num_cpus",
+]
+
+[[package]]
+name = "time"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "time"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cde1cf55178e0293453ba2cca0d5f8392a922e52aa958aee9c28ed02becc6d03"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "tiny_http"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ce51b50006056f590c9b7c3808c3bd70f0d1101666629713866c227d6e58d39"
+dependencies = [
+ "ascii",
+ "chrono",
+ "chunked_transfer",
+ "log",
+ "url",
+]
+
+[[package]]
+name = "tinyvec"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f83b2a3d4d9091d0abd7eba4dc2710b1718583bd4d8992e2190720ea38f391f7"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
+[[package]]
+name = "twoway"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59b11b2b5241ba34be09c3cc85a36e56e48f9888862e19cedf23336d35316ed1"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "twoway"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c57ffb460d7c24cd6eda43694110189030a3d1dfe418416d9468fd1c1d290b47"
+dependencies = [
+ "memchr",
+ "unchecked-index",
+]
+
+[[package]]
+name = "typed-arena"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9b2228007eba4120145f785df0f6c92ea538f5a3635a612ecf4e334c8c1446d"
+
+[[package]]
+name = "typenum"
+version = "1.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b63708a265f51345575b27fe43f9500ad611579e764c79edbc2037b1121959ec"
+
+[[package]]
+name = "ucd-trie"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
+
+[[package]]
+name = "unchecked-index"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eeba86d422ce181a719445e51872fa30f1f7413b62becb52e95ec91aa262d85c"
+
+[[package]]
+name = "unicase"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
+[[package]]
+name = "unicode-bidi"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a01404663e3db436ed2746d9fefef640d868edae3cceb81c3b8d5732fda678f"
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d54590932941a9e9266f0832deed84ebe1bf2e4c9e4a3554d393d18f5e854bf9"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
+
+[[package]]
+name = "unicode_categories"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39ec24b3121d976906ece63c9daad25b85969647682eee313cb5779fdd69e14e"
+
+[[package]]
+name = "url"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507c383b2d33b5fc35d1861e77e6b383d158b2da5e14fe51b83dfedf6fd578c"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
+[[package]]
+name = "version_check"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
+
+[[package]]
+name = "walkdir"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
+dependencies = [
+ "same-file",
+ "winapi",
+ "winapi-util",
+]
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "wasi"
+version = "0.10.2+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "xdg"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de4cfc7dc9727713f386aadce9496f1ed64ea368d9f1f813a54d0f98f8741286"
+dependencies = [
+ "dirs",
+]
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
diff --git a/tools/cheddar/Cargo.toml b/tools/cheddar/Cargo.toml
new file mode 100644
index 000000000000..6cc8163c730a
--- /dev/null
+++ b/tools/cheddar/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "cheddar"
+version = "0.2.0"
+authors = ["Vincent Ambo <mail@tazj.in>"]
+edition = "2018"
+
+[dependencies]
+clap = "2.33"
+comrak = "0.10"
+lazy_static = "1.4"
+rouille = "3.0"
+syntect = "4.5.0"
+serde_json = "1.0"
+regex = "1.4"
+
+[dependencies.serde]
+version = "1.0"
+features = [ "derive" ]
diff --git a/tools/cheddar/README.md b/tools/cheddar/README.md
new file mode 100644
index 000000000000..706f3b62d552
--- /dev/null
+++ b/tools/cheddar/README.md
@@ -0,0 +1,21 @@
+cheddar
+=======
+
+Cheddar is a tiny Rust tool that uses [syntect][] to render source code to
+syntax-highlighted HTML.
+
+It's invocation is compatible with `cgit` filters, i.e. data is read from
+`stdin` and the filename is taken from `argv`:
+
+```shell
+cat README.md | cheddar README.md > README.html
+
+```
+
+In fact, if you are looking at this file on git.tazj.in chances are that it was
+rendered by cheddar.
+
+The name was chosen because I was eyeing a pack of cheddar-flavoured crisps
+while thinking about name selection.
+
+[syntect]: https://github.com/trishume/syntect
diff --git a/tools/cheddar/build.rs b/tools/cheddar/build.rs
new file mode 100644
index 000000000000..b63b2e337851
--- /dev/null
+++ b/tools/cheddar/build.rs
@@ -0,0 +1,50 @@
+//! Build script that can be used outside of Nix builds to inject the
+//! BAT_SYNTAXES variable when building in development mode.
+//!
+//! Note that this script assumes that cheddar is in a checkout of the
+//! TVL depot.
+
+use std::process::Command;
+
+static BAT_SYNTAXES: &str = "BAT_SYNTAXES";
+static ERROR_MESSAGE: &str = r#"Failed to build syntax set.
+
+When building during development, cheddar expects to be in a checkout
+of the TVL depot. This is required to automatically build the syntax
+highlighting files that are needed at compile time.
+
+As cheddar can not automatically detect the location of the syntax
+files, you must set the `BAT_SYNTAXES` environment variable to the
+right path.
+
+The expected syntax files are at //third_party/bat_syntaxes in the
+depot."#;
+
+fn main() {
+    // Do nothing if the variable is already set (e.g. via Nix)
+    if let Ok(_) = std::env::var(BAT_SYNTAXES) {
+        return;
+    }
+
+    // Otherwise ask Nix to build it and inject the result.
+    let output = Command::new("nix-build")
+        .arg("-A").arg("third_party.bat_syntaxes")
+        // ... assuming cheddar is at //tools/cheddar ...
+        .arg("../..")
+        .output()
+        .expect(ERROR_MESSAGE);
+
+    if !output.status.success() {
+        eprintln!("{}\nNix output: {}", ERROR_MESSAGE, String::from_utf8_lossy(&output.stderr));
+        return;
+    }
+
+    let out_path = String::from_utf8(output.stdout)
+        .expect("Nix returned invalid output after building syntax set");
+
+    // Return an instruction to Cargo that will set the environment
+    // variable during rustc calls.
+    //
+    // https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-envvarvalue
+    println!("cargo:rustc-env={}={}", BAT_SYNTAXES, out_path.trim());
+}
diff --git a/tools/cheddar/default.nix b/tools/cheddar/default.nix
new file mode 100644
index 000000000000..c8d7ba5ffef2
--- /dev/null
+++ b/tools/cheddar/default.nix
@@ -0,0 +1,12 @@
+{ depot, pkgs, ... }:
+
+depot.third_party.naersk.buildPackage {
+  src = ./.;
+  doDoc = false;
+
+  override = x: {
+    # Use our custom bat syntax set, which is everything from upstream,
+    # plus additional languages we care about.
+    BAT_SYNTAXES = "${depot.third_party.bat_syntaxes}";
+  };
+}
diff --git a/tools/cheddar/src/bin/cheddar.rs b/tools/cheddar/src/bin/cheddar.rs
new file mode 100644
index 000000000000..58ef32a1b432
--- /dev/null
+++ b/tools/cheddar/src/bin/cheddar.rs
@@ -0,0 +1,135 @@
+//! This file defines the binary for cheddar, which can be interacted
+//! with in two different ways:
+//!
+//! 1. As a CLI tool that acts as a cgit filter.
+//! 2. As a long-running HTTP server that handles rendering requests
+//!    (matching the SourceGraph protocol).
+use clap::{App, Arg};
+use rouille::Response;
+use rouille::{router, try_or_400};
+use serde::Deserialize;
+use serde_json::json;
+use std::collections::HashMap;
+use std::io;
+
+use cheddar::{THEMES, format_code, format_markdown};
+
+// Server endpoint for rendering the syntax of source code. This
+// replaces the 'syntect_server' component of Sourcegraph.
+fn code_endpoint(request: &rouille::Request) -> rouille::Response {
+    #[derive(Deserialize)]
+    struct SourcegraphQuery {
+        filepath: String,
+        theme: String,
+        code: String,
+    }
+
+    let query: SourcegraphQuery = try_or_400!(rouille::input::json_input(request));
+    let mut buf: Vec<u8> = Vec::new();
+
+    // We don't use syntect with the sourcegraph themes bundled
+    // currently, so let's fall back to something that is kind of
+    // similar (tm).
+    let theme = &THEMES.themes[match query.theme.as_str() {
+        "Sourcegraph (light)" => "Solarized (light)",
+        _ => "Solarized (dark)",
+    }];
+
+    format_code(theme, &mut query.code.as_bytes(), &mut buf, &query.filepath);
+
+    Response::json(&json!({
+        "is_plaintext": false,
+        "data": String::from_utf8_lossy(&buf)
+    }))
+}
+
+// Server endpoint for rendering a Markdown file.
+fn markdown_endpoint(request: &rouille::Request) -> rouille::Response {
+    let mut texts: HashMap<String, String> = try_or_400!(rouille::input::json_input(request));
+
+    for text in texts.values_mut() {
+        let mut buf: Vec<u8> = Vec::new();
+        format_markdown(&mut text.as_bytes(), &mut buf);
+        *text = String::from_utf8_lossy(&buf).to_string();
+    }
+
+    Response::json(&texts)
+}
+
+fn highlighting_server(listen: &str) {
+    println!("Starting syntax highlighting server on '{}'", listen);
+
+    rouille::start_server(listen, move |request| {
+        router!(request,
+                // Markdown rendering route
+                (POST) (/markdown) => {
+                    markdown_endpoint(request)
+                },
+
+                // Code rendering route
+                (POST) (/) => {
+                    code_endpoint(request)
+                },
+
+                _ => {
+                    rouille::Response::empty_404()
+                },
+        )
+    });
+}
+
+fn main() {
+    // Parse the command-line flags passed to cheddar to determine
+    // whether it is running in about-filter mode (`--about-filter`)
+    // and what file extension has been supplied.
+    let matches = App::new("cheddar")
+        .about("TVL's syntax highlighter")
+        .arg(
+            Arg::with_name("about-filter")
+                .help("Run as a cgit about-filter (renders Markdown)")
+                .long("about-filter")
+                .takes_value(false),
+        )
+        .arg(
+            Arg::with_name("sourcegraph-server")
+                .help("Run as a Sourcegraph compatible web-server")
+                .long("sourcegraph-server")
+                .takes_value(false),
+        )
+        .arg(
+            Arg::with_name("listen")
+                .help("Address to listen on")
+                .long("listen")
+                .takes_value(true),
+        )
+        .arg(Arg::with_name("filename").help("File to render").index(1))
+        .get_matches();
+
+    if matches.is_present("sourcegraph-server") {
+        highlighting_server(
+            matches
+                .value_of("listen")
+                .expect("Listening address is required for server mode"),
+        );
+        return;
+    }
+
+    let filename = matches.value_of("filename").expect("filename is required");
+
+    let stdin = io::stdin();
+    let mut in_handle = stdin.lock();
+
+    let stdout = io::stdout();
+    let mut out_handle = stdout.lock();
+
+    if matches.is_present("about-filter") && filename.ends_with(".md") {
+        format_markdown(&mut in_handle, &mut out_handle);
+    } else {
+        format_code(
+            &THEMES.themes["InspiredGitHub"],
+            &mut in_handle,
+            &mut out_handle,
+            filename,
+        );
+    }
+}
diff --git a/tools/cheddar/src/lib.rs b/tools/cheddar/src/lib.rs
new file mode 100644
index 000000000000..e5d7aad1e62c
--- /dev/null
+++ b/tools/cheddar/src/lib.rs
@@ -0,0 +1,337 @@
+//! This file implements the rendering logic of cheddar with public
+//! functions for syntax-highlighting code and for turning Markdown
+//! into HTML with TVL extensions.
+use comrak::arena_tree::Node;
+use comrak::nodes::{Ast, AstNode, NodeCodeBlock, NodeHtmlBlock, NodeValue};
+use comrak::{format_html, parse_document, Arena, ComrakOptions};
+use lazy_static::lazy_static;
+use regex::Regex;
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::env;
+use std::ffi::OsStr;
+use std::io;
+use std::io::BufRead;
+use std::io::Write;
+use std::path::Path;
+use syntect::dumps::from_binary;
+use syntect::easy::HighlightLines;
+use syntect::highlighting::{Theme, ThemeSet};
+use syntect::parsing::{SyntaxReference, SyntaxSet};
+use syntect::util::LinesWithEndings;
+
+use syntect::html::{
+    append_highlighted_html_for_styled_line, start_highlighted_html_snippet, IncludeBackground,
+};
+
+#[cfg(test)]
+mod tests;
+
+lazy_static! {
+    // Load syntaxes lazily. Initialisation might not be required in
+    // the case of Markdown rendering (if there's no code blocks
+    // within the document).
+    //
+    // Note that the syntax set is included from the path pointed to
+    // by the BAT_SYNTAXES environment variable at compile time. This
+    // variable is populated by Nix and points to TVL's syntax set.
+    static ref SYNTAXES: SyntaxSet = from_binary(include_bytes!(env!("BAT_SYNTAXES")));
+    pub static ref THEMES: ThemeSet = ThemeSet::load_defaults();
+
+    // Configure Comrak's Markdown rendering with all the bells &
+    // whistles!
+    static ref MD_OPTS: ComrakOptions = {
+        let mut options = ComrakOptions::default();
+
+        // Enable non-standard Markdown features:
+        options.extension.strikethrough = true;
+        options.extension.tagfilter = true;
+        options.extension.table = true;
+        options.extension.autolink = true;
+        options.extension.tasklist = true;
+        options.extension.header_ids = Some(String::new()); // yyeeesss!
+        options.extension.footnotes = true;
+        options.extension.description_lists = true;
+        options.extension.front_matter_delimiter = Some("---".to_owned());
+
+        // Required for tagfilter
+        options.render.unsafe_ = true;
+
+        options
+    };
+
+    // Configures a map of specific filenames to languages, for cases
+    // where the detection by extension or other heuristics fails.
+    static ref FILENAME_OVERRIDES: HashMap<&'static str, &'static str> = {
+        let mut map = HashMap::new();
+        // rules.pl is the canonical name of the submit rule file in
+        // Gerrit, which is written in Prolog.
+        map.insert("rules.pl", "Prolog");
+        map
+    };
+
+    // Default shortlink set used in cheddar (i.e. TVL's shortlinks)
+    static ref TVL_LINKS: Vec<Shortlink> = vec![
+        // TVL shortlinks for bugs and changelists (e.g. b/123,
+        // cl/123). Coincidentally these have the same format, which
+        // makes the initial implementation easy.
+        Shortlink {
+            pattern: Regex::new(r#"\b(?P<type>b|cl)/(?P<dest>\d+)\b"#).unwrap(),
+            replacement: "[$type/$dest](https://$type.tvl.fyi/$dest)",
+        }
+    ];
+}
+
+/// Structure that describes a single shortlink that should be
+/// automatically highlighted. Highlighting is performed as a string
+/// replacement over input Markdown.
+pub struct Shortlink {
+    /// Short link pattern to recognise. Make sure to anchor these
+    /// correctly.
+    pub pattern: Regex,
+
+    /// Replacement string, as per the documentation of
+    /// [`Regex::replace`].
+    pub replacement: &'static str,
+}
+
+// HTML fragment used when rendering inline blocks in Markdown documents.
+// Emulates the GitHub style (subtle background hue and padding).
+const BLOCK_PRE: &str = "<pre style=\"background-color:#f6f8fa;padding:16px;\">\n";
+
+fn should_continue(res: &io::Result<usize>) -> bool {
+    match *res {
+        Ok(n) => n > 0,
+        Err(_) => false,
+    }
+}
+
+// This function is taken from the Comrak documentation.
+fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F)
+where
+    F: Fn(&'a AstNode<'a>),
+{
+    f(node);
+    for c in node.children() {
+        iter_nodes(c, f);
+    }
+}
+
+// Many of the syntaxes in the syntax list have random capitalisations, which
+// means that name matching for the block info of a code block in HTML fails.
+//
+// Instead, try finding a syntax match by comparing case insensitively (for
+// ASCII characters, anyways).
+fn find_syntax_case_insensitive(info: &str) -> Option<&'static SyntaxReference> {
+    // TODO(tazjin): memoize this lookup
+    SYNTAXES
+        .syntaxes()
+        .iter()
+        .rev()
+        .find(|&s| info.eq_ignore_ascii_case(&s.name))
+}
+
+// Replaces code-block inside of a Markdown AST with HTML blocks rendered by
+// syntect. This enables static (i.e. no JavaScript) syntax highlighting, even
+// of complex languages.
+fn highlight_code_block(code_block: &NodeCodeBlock) -> NodeValue {
+    let theme = &THEMES.themes["InspiredGitHub"];
+    let info = String::from_utf8_lossy(&code_block.info);
+
+    let syntax = find_syntax_case_insensitive(&info)
+        .or_else(|| SYNTAXES.find_syntax_by_extension(&info))
+        .unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
+
+    let code = String::from_utf8_lossy(&code_block.literal);
+
+    let rendered = {
+        // Write the block preamble manually to get exactly the
+        // desired layout:
+        let mut hl = HighlightLines::new(syntax, theme);
+        let mut buf = BLOCK_PRE.to_string();
+
+        for line in LinesWithEndings::from(&code) {
+            let regions = hl.highlight(line, &SYNTAXES);
+            append_highlighted_html_for_styled_line(&regions[..], IncludeBackground::No, &mut buf);
+        }
+
+        buf.push_str("</pre>");
+        buf
+    };
+
+    let mut block = NodeHtmlBlock::default();
+    block.literal = rendered.into_bytes();
+
+    NodeValue::HtmlBlock(block)
+}
+
+// Supported callout elements (which each have their own distinct rendering):
+enum Callout {
+    Todo,
+    Warning,
+    Question,
+    Tip,
+}
+
+// Determine whether the first child of the supplied node contains a text that
+// should cause a callout section to be rendered.
+fn has_callout<'a>(node: &Node<'a, RefCell<Ast>>) -> Option<Callout> {
+    match node.first_child().map(|c| c.data.borrow()) {
+        Some(child) => match &child.value {
+            NodeValue::Text(text) => {
+                if text.starts_with(b"TODO") {
+                    return Some(Callout::Todo);
+                } else if text.starts_with(b"WARNING") {
+                    return Some(Callout::Warning);
+                } else if text.starts_with(b"QUESTION") {
+                    return Some(Callout::Question);
+                } else if text.starts_with(b"TIP") {
+                    return Some(Callout::Tip);
+                }
+
+                None
+            }
+            _ => None,
+        },
+        _ => None,
+    }
+}
+
+// Replace instances of known shortlinks in the input document with
+// Markdown syntax for a highlighted link.
+fn linkify_shortlinks(mut text: String, shortlinks: &[Shortlink]) -> String {
+    for link in shortlinks {
+        text = link
+            .pattern
+            .replace_all(&text, link.replacement)
+            .to_string();
+    }
+
+    return text;
+}
+
+fn format_callout_paragraph(callout: Callout) -> NodeValue {
+    let class = match callout {
+        Callout::Todo => "cheddar-todo",
+        Callout::Warning => "cheddar-warning",
+        Callout::Question => "cheddar-question",
+        Callout::Tip => "cheddar-tip",
+    };
+
+    let mut block = NodeHtmlBlock::default();
+    block.literal = format!("<p class=\"cheddar-callout {}\">", class).into_bytes();
+    NodeValue::HtmlBlock(block)
+}
+
+pub fn format_markdown_with_shortlinks<R: BufRead, W: Write>(
+    reader: &mut R,
+    writer: &mut W,
+    shortlinks: &[Shortlink],
+) {
+    let document = {
+        let mut buffer = String::new();
+        reader
+            .read_to_string(&mut buffer)
+            .expect("reading should work");
+        buffer
+    };
+
+    let arena = Arena::new();
+    let root = parse_document(&arena, &linkify_shortlinks(document, shortlinks), &MD_OPTS);
+
+    // This node must exist with a lifetime greater than that of the parsed AST
+    // in case that callouts are encountered (otherwise insertion into the tree
+    // is not possible).
+    let mut p_close_value = NodeHtmlBlock::default();
+    p_close_value.literal = b"</p>".to_vec();
+
+    let p_close_node = Ast::new(NodeValue::HtmlBlock(p_close_value));
+    let p_close = Node::new(RefCell::new(p_close_node));
+
+    // Special features of Cheddar are implemented by traversing the
+    // arena and reacting on nodes that we might want to modify.
+    iter_nodes(root, &|node| {
+        let mut ast = node.data.borrow_mut();
+        let new = match &ast.value {
+            // Syntax highlighting is implemented by replacing the
+            // code block node with literal HTML.
+            NodeValue::CodeBlock(code) => Some(highlight_code_block(code)),
+
+            NodeValue::Paragraph => {
+                if let Some(callout) = has_callout(node) {
+                    node.insert_after(&p_close);
+                    Some(format_callout_paragraph(callout))
+                } else {
+                    None
+                }
+            }
+            _ => None,
+        };
+
+        if let Some(new_value) = new {
+            ast.value = new_value
+        }
+    });
+
+    format_html(root, &MD_OPTS, writer).expect("Markdown rendering failed");
+}
+
+pub fn format_markdown<R: BufRead, W: Write>(reader: &mut R, writer: &mut W) {
+    format_markdown_with_shortlinks(reader, writer, &TVL_LINKS)
+}
+
+fn find_syntax_for_file(filename: &str) -> &'static SyntaxReference {
+    (*FILENAME_OVERRIDES)
+        .get(filename)
+        .and_then(|name| SYNTAXES.find_syntax_by_name(name))
+        .or_else(|| {
+            Path::new(filename)
+                .extension()
+                .and_then(OsStr::to_str)
+                .and_then(|s| SYNTAXES.find_syntax_by_extension(s))
+        })
+        .unwrap_or_else(|| SYNTAXES.find_syntax_plain_text())
+}
+
+pub fn format_code<R: BufRead, W: Write>(
+    theme: &Theme,
+    reader: &mut R,
+    writer: &mut W,
+    filename: &str,
+) {
+    let mut linebuf = String::new();
+
+    // Get the first line, we might need it for syntax identification.
+    let mut read_result = reader.read_line(&mut linebuf);
+    let syntax = find_syntax_for_file(filename);
+
+    let mut hl = HighlightLines::new(syntax, theme);
+    let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
+
+    // Rather than using the `lines` iterator, read each line manually
+    // and maintain buffer state.
+    //
+    // This is done because the syntax highlighter requires trailing
+    // newlines to be efficient, and those are stripped in the lines
+    // iterator.
+    while should_continue(&read_result) {
+        let regions = hl.highlight(&linebuf, &SYNTAXES);
+
+        append_highlighted_html_for_styled_line(
+            &regions[..],
+            IncludeBackground::IfDifferent(bg),
+            &mut outbuf,
+        );
+
+        // immediately output the current state to avoid keeping
+        // things in memory
+        write!(writer, "{}", outbuf).expect("write should not fail");
+
+        // merry go round again
+        linebuf.clear();
+        outbuf.clear();
+        read_result = reader.read_line(&mut linebuf);
+    }
+
+    writeln!(writer, "</pre>").expect("write should not fail");
+}
diff --git a/tools/cheddar/src/tests.rs b/tools/cheddar/src/tests.rs
new file mode 100644
index 000000000000..5b7b1cc52a95
--- /dev/null
+++ b/tools/cheddar/src/tests.rs
@@ -0,0 +1,97 @@
+use super::*;
+use std::io::BufReader;
+
+// Markdown rendering expectation, ignoring leading and trailing
+// whitespace in the input and output.
+fn expect_markdown(input: &str, expected: &str) {
+    let mut input_buf = BufReader::new(input.trim().as_bytes());
+    let mut out_buf: Vec<u8> = vec![];
+    format_markdown(&mut input_buf, &mut out_buf);
+
+    let out_string = String::from_utf8(out_buf).expect("output should be UTF8");
+    assert_eq!(out_string.trim(), expected.trim());
+}
+
+#[test]
+fn renders_simple_markdown() {
+    expect_markdown("hello", "<p>hello</p>\n");
+}
+
+#[test]
+fn renders_callouts() {
+    expect_markdown(
+        "TODO some task.",
+        r#"<p class="cheddar-callout cheddar-todo">
+TODO some task.
+</p>
+"#,
+    );
+
+    expect_markdown(
+        "WARNING: be careful",
+        r#"<p class="cheddar-callout cheddar-warning">
+WARNING: be careful
+</p>
+"#,
+    );
+
+    expect_markdown(
+        "TIP: note the thing",
+        r#"<p class="cheddar-callout cheddar-tip">
+TIP: note the thing
+</p>
+"#,
+    );
+}
+
+#[test]
+fn renders_code_snippets() {
+    expect_markdown(
+        r#"
+Code:
+```nix
+toString 42
+```
+"#,
+        r#"
+<p>Code:</p>
+<pre style="background-color:#f6f8fa;padding:16px;">
+<span style="color:#62a35c;">toString </span><span style="color:#0086b3;">42
+</span></pre>
+"#,
+    );
+}
+
+#[test]
+fn highlights_bug_link() {
+    expect_markdown(
+        "Please look at b/123.",
+        "<p>Please look at <a href=\"https://b.tvl.fyi/123\">b/123</a>.</p>",
+    );
+}
+
+#[test]
+fn highlights_cl_link() {
+    expect_markdown(
+        "Please look at cl/420.",
+        "<p>Please look at <a href=\"https://cl.tvl.fyi/420\">cl/420</a>.</p>",
+    );
+}
+
+#[test]
+fn highlights_multiple_shortlinks() {
+    expect_markdown(
+        "Please look at cl/420, b/123.",
+        "<p>Please look at <a href=\"https://cl.tvl.fyi/420\">cl/420</a>, <a href=\"https://b.tvl.fyi/123\">b/123</a>.</p>",
+    );
+
+    expect_markdown(
+        "b/213/cl/213 are different things",
+        "<p><a href=\"https://b.tvl.fyi/213\">b/213</a>/<a href=\"https://cl.tvl.fyi/213\">cl/213</a> are different things</p>",
+    );
+}
+
+#[test]
+fn ignores_invalid_shortlinks() {
+    expect_markdown("b/abc is not a real bug", "<p>b/abc is not a real bug</p>");
+}