refactor(tvix/eval): use Clap for arg+env parsing r/4911

Refactor the environment variable and argument parsing for the tvix repl
to use Clap instead of doing things ad-hoc, and thread through options
obtained from environment variables via explicit arguments rather than
obtaining them from the environment as they're needed. This makes adding
more flags more sustainable, and also makes the binary fully
self-documenting, including supported env vars, via `--help`.

Change-Id: Ib1f6a0cd20056e8c9196760ff755fa5729667760
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6653
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

1 files changed, 106 insertions, 2 deletions

diff --git a/tvix/eval/Cargo.lock b/tvix/eval/Cargo.lock
index 2804e7f1298f..71c6525b0a41 100644
--- a/tvix/eval/Cargo.lock
+++ b/tvix/eval/Cargo.lock
@@ -74,11 +74,50 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
 dependencies = [
  "bitflags",
- "textwrap",
+ "textwrap 0.11.0",
  "unicode-width",
 ]
 
 [[package]]
+name = "clap"
+version = "3.2.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86447ad904c7fb335a790c9d7fe3d0d971dc523b8ccd1561a520de9a85302750"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_derive",
+ "clap_lex",
+ "indexmap",
+ "once_cell",
+ "strsim",
+ "termcolor",
+ "textwrap 0.15.1",
+]
+
+[[package]]
+name = "clap_derive"
+version = "3.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea0c8bce528c4be4da13ea6fead8965e95b6073585a2f05204bd8f4119f82a65"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2 1.0.43",
+ "quote 1.0.21",
+ "syn 1.0.99",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
+dependencies = [
+ "os_str_bytes",
+]
+
+[[package]]
 name = "clipboard-win"
 version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -120,7 +159,7 @@ checksum = "b01d6de93b2b6c65e17c634a26653a29d107b3c98c607c765bf38d041531cd8f"
 dependencies = [
  "atty",
  "cast",
- "clap",
+ "clap 2.34.0",
  "criterion-plot",
  "csv",
  "itertools",
@@ -371,6 +410,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
 [[package]]
+name = "heck"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
+
+[[package]]
 name = "hermit-abi"
 version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -380,6 +425,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "indexmap"
+version = "1.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+]
+
+[[package]]
 name = "instant"
 version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -518,6 +573,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
 
 [[package]]
+name = "os_str_bytes"
+version = "6.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ff7415e9ae3fff1225851df9e0d9e4e5479f947619774677a63572e55e80eff"
+
+[[package]]
 name = "output_vt100"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -579,6 +640,30 @@ dependencies = [
 ]
 
 [[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2 1.0.43",
+ "quote 1.0.21",
+ "syn 1.0.99",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2 1.0.43",
+ "quote 1.0.21",
+ "version_check",
+]
+
+[[package]]
 name = "proc-macro2"
 version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -943,6 +1028,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e08d8363704e6c71fc928674353e6b7c23dcea9d82d7012c8faf2a3a025f8d0"
 
 [[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
 name = "structmeta"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1069,6 +1160,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "textwrap"
+version = "0.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "949517c0cf1bf4ee812e2e07e08ab448e3ae0d23472aee8a06c985f0c8815b16"
+
+[[package]]
 name = "thiserror"
 version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1102,6 +1199,7 @@ dependencies = [
 name = "tvix-eval"
 version = "0.1.0"
 dependencies = [
+ "clap 3.2.22",
  "codemap",
  "codemap-diagnostic",
  "criterion",
@@ -1151,6 +1249,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "936e4b492acfd135421d8dca4b1aa80a7bfc26e702ef3af710e0752684df5372"
 
 [[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
 name = "walkdir"
 version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"