feat(cheddar): Add Sourcegraph-compatible highlighting server r/1044

Sourcegraph uses a component called syntect_server to syntax-highlight
source files.

Since we already have custom syntaxes, overrides and configuration we
might as well use them with Sourcegraph!

This implements the syntect_server "protocol" (it's just a single
endpoint) so that we can swap out the syntect_server component with
cheddar.

Note: There's a few clippy lints here, but they're being solved in a
followup commit because I wanted to take care of all of them at
once (not just the ones introduced in this change).

Change-Id: Ib518a2fa1b9fee299fe599482403599583cac479
Reviewed-on: https://cl.tvl.fyi/c/depot/+/509
Reviewed-by: lukegb <lukegb@tvl.fyi>

3 files changed, 765 insertions, 51 deletions

diff --git a/tools/cheddar/Cargo.lock b/tools/cheddar/Cargo.lock
index ab1225cc6bea..4264e7c34dfd 100644
--- a/tools/cheddar/Cargo.lock
+++ b/tools/cheddar/Cargo.lock
@@ -22,6 +22,21 @@ dependencies = [
 ]
 
 [[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "ascii"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -33,11 +48,30 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "autocfg"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "base64"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "base64"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "base64"
 version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
@@ -47,7 +81,7 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.112 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.113 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -56,6 +90,16 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "blake2b_simd"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "block-buffer"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -75,6 +119,33 @@ dependencies = [
 ]
 
 [[package]]
+name = "brotli-sys"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "brotli2"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "brotli-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "buf_redux"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "byte-tools"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -101,6 +172,9 @@ dependencies = [
  "clap 2.33.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "comrak 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rouille 3.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.113 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)",
  "syntect 4.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -111,9 +185,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "chunked_transfer"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "clap"
 version = "2.33.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -128,6 +208,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "cloudabi"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "comrak"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -144,6 +232,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "crc32fast"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -152,6 +245,26 @@ dependencies = [
 ]
 
 [[package]]
+name = "crossbeam-utils"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "deflate"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gzip-header 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "digest"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -160,6 +273,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "dirs"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_users 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "entities"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -170,6 +293,17 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "filetime"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "flate2"
 version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -186,6 +320,11 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "generic-array"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -194,6 +333,24 @@ dependencies = [
 ]
 
 [[package]]
+name = "getrandom"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gzip-header"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "hermit-abi"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -202,6 +359,21 @@ dependencies = [
 ]
 
 [[package]]
+name = "httparse"
+version = "1.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "idna"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "indexmap"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -243,16 +415,56 @@ version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "log"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "log"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "maplit"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "matches"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "memchr"
 version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "mime"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "mime_guess"
+version = "1.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "mime 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_codegen 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "miniz_oxide"
 version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -261,6 +473,23 @@ dependencies = [
 ]
 
 [[package]]
+name = "multipart"
+version = "0.15.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "buf_redux 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime_guess 1.8.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "twoway 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "num-integer"
 version = "0.1.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -278,6 +507,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "num_cpus"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hermit-abi 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "onig"
 version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -303,6 +541,11 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "percent-encoding"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "pest"
 version = "2.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -342,6 +585,41 @@ dependencies = [
 ]
 
 [[package]]
+name = "phf"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_generator 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "pkg-config"
 version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -355,7 +633,7 @@ dependencies = [
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "line-wrap 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.112 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.113 (registry+https://github.com/rust-lang/crates.io-index)",
  "xml-rs 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -368,6 +646,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "quick-error"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "quote"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -376,6 +659,149 @@ dependencies = [
 ]
 
 [[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rand_hc"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_jitter"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_os"
+version = "0.1.3"
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@@ -392,6 +818,49 @@ version = "0.6.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -411,12 +880,15 @@ dependencies = [
 
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-version = "1.0.112"
+version = "1.0.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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 [[package]]
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@@ -431,7 +903,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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- "serde 1.0.112 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.113 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@@ -446,6 +918,16 @@ dependencies = [
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 [[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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+
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@@ -474,14 +956,33 @@ dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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@@ -498,6 +999,48 @@ dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -527,6 +1070,30 @@ version = "0.2.2"
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 [[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+
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@@ -542,11 +1109,26 @@ version = "0.1.1"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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 [[package]]
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diff --git a/tools/cheddar/Cargo.toml b/tools/cheddar/Cargo.toml
index b7d9a775861d..66830e67d6f5 100644
--- a/tools/cheddar/Cargo.toml
+++ b/tools/cheddar/Cargo.toml
@@ -5,7 +5,13 @@ authors = ["Vincent Ambo <mail@tazj.in>"]
 edition = "2018"
 
 [dependencies]
+clap = "2.33"
 comrak = "0.7"
 lazy_static = "1.4"
+rouille = "3.0"
 syntect = "4.2.0"
-clap = "2.33"
+serde_json = "1.0"
+
+[dependencies.serde]
+version = "1.0"
+features = [ "derive" ]
diff --git a/tools/cheddar/src/main.rs b/tools/cheddar/src/main.rs
index dbb25c767bd4..b6229aa3f754 100644
--- a/tools/cheddar/src/main.rs
+++ b/tools/cheddar/src/main.rs
@@ -3,6 +3,9 @@ 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 rouille::try_or_400;
+use rouille::Response;
+use serde::Deserialize;
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::env;
@@ -13,9 +16,10 @@ use std::io::Write;
 use std::path::Path;
 use syntect::dumps::from_binary;
 use syntect::easy::HighlightLines;
-use syntect::highlighting::ThemeSet;
+use syntect::highlighting::{Theme, ThemeSet};
 use syntect::parsing::{SyntaxReference, SyntaxSet};
 use syntect::util::LinesWithEndings;
+use serde_json::json;
 
 use syntect::html::{
     append_highlighted_html_for_styled_line, start_highlighted_html_snippet, IncludeBackground,
@@ -58,19 +62,6 @@ lazy_static! {
 // Emulates the GitHub style (subtle background hue and padding).
 const BLOCK_PRE: &str = "<pre style=\"background-color:#f6f8fa;padding:16px;\">\n";
 
-#[derive(Debug, Default)]
-struct Args {
-    /// Should Cheddar run as an about filter? (i.e. give special
-    /// rendering treatment to Markdown documents)
-    about_filter: bool,
-
-    /// What file extension has been supplied (if any)?
-    extension: Option<String>,
-
-    /// Which language to override the detection to (if any)?
-    lang_override: Option<&'static str>,
-}
-
 fn should_continue(res: &io::Result<usize>) -> bool {
     match *res {
         Ok(n) => n > 0,
@@ -237,24 +228,30 @@ fn format_markdown<R: BufRead, W: Write>(reader: &mut R, writer: &mut W) {
     format_html(root, &MD_OPTS, writer).expect("Markdown rendering failed");
 }
 
-fn format_code<R: BufRead, W: Write>(reader: &mut R, writer: &mut W, args: &Args) {
+fn find_syntax_for_file(filename: &str) -> &'static SyntaxReference {
+    return (*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());
+}
+
+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);
-
-    // Set up the highlighter
-    let theme = &THEMES.themes["InspiredGitHub"];
-
-    let syntax = args
-        .lang_override
-        .and_then(|l| SYNTAXES.find_syntax_by_name(l))
-        .or_else(|| match args.extension {
-            Some(ref ext) => SYNTAXES.find_syntax_by_extension(ext),
-            None => None,
-        })
-        .or_else(|| SYNTAXES.find_syntax_by_first_line(&linebuf))
-        .unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
+    let syntax = find_syntax_for_file(filename);
 
     let mut hl = HighlightLines::new(syntax, theme);
     let (mut outbuf, bg) = start_highlighted_html_snippet(theme);
@@ -287,6 +284,46 @@ fn format_code<R: BufRead, W: Write>(reader: &mut R, writer: &mut W, args: &Args
     writeln!(writer, "</pre>").expect("write should not fail");
 }
 
+// Starts a Sourcegraph-compatible syntax highlighting server. This
+// replaces the 'syntect_server' component of Sourcegraph.
+fn highlighting_server(listen: &str) {
+    println!("Starting syntax highlighting server on '{}'", listen);
+    #[derive(Deserialize)]
+    struct SourcegraphQuery {
+        filepath: String,
+        theme: String,
+        code: String,
+    }
+
+    // Sourcegraph only uses a single endpoint, so we don't attempt to
+    // deal with routing here for now.
+    rouille::start_server(listen, move |request| {
+        let query: SourcegraphQuery = try_or_400!(rouille::input::json_input(request));
+        println!("Handling highlighting request for '{}'", query.filepath);
+        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)
+        }))
+    });
+}
+
 fn main() {
     // Parse the command-line flags passed to cheddar to determine
     // whether it is running in about-filter mode (`--about-filter`)
@@ -299,21 +336,31 @@ fn main() {
                 .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();
 
-    let mut args = Args::default();
-    args.about_filter = matches.is_present("about-filter");
-
-    let filename = matches.value_of("filename").expect("filename is required");
-    if let Some(lang) = (*FILENAME_OVERRIDES).get(filename) {
-        args.lang_override = Some(lang);
+    if matches.is_present("sourcegraph-server") {
+        highlighting_server(
+            matches
+                .value_of("listen")
+                .expect("Listening address is required for server mode"),
+        );
+        return;
     }
 
-    args.extension = Path::new(&filename)
-        .extension()
-        .and_then(OsStr::to_str)
-        .map(|s| s.to_string());
+    let filename = matches.value_of("filename").expect("filename is required");
 
     let stdin = io::stdin();
     let mut in_handle = stdin.lock();
@@ -321,8 +368,14 @@ fn main() {
     let stdout = io::stdout();
     let mut out_handle = stdout.lock();
 
-    match args.extension.as_ref().map(String::as_str) {
-        Some("md") if args.about_filter => format_markdown(&mut in_handle, &mut out_handle),
-        _ => format_code(&mut in_handle, &mut out_handle, &args),
+    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,
+        );
     }
 }