Significant cleanup of CLI interface

- Switched to structopt, built off of clap
- Added `--log` and `--log-format` for `tracing-subscriber`
- Moved `int lex` to a more general `unpretty` a la Rust's -Zunpretty=
- Remove expr_parser in favour of a (soon to be completed) unpretty AST
  backend
- Add `codespan_reporting::files::Files` to `calypso_diagnostic`'s
  prelude
- Fix description in main Cargo.toml (woops how did I never notice I
  never changed that)
- Generally appease clippy
- Fix pre-commit hook as I accidentally made a fatal `cargo check` not
  exit with a non-zero code when it should

Author: ThePuzzlemaker

.etc/pre-commit

@@ -8,7 +8,7 @@ def main():
     res = subprocess.run(["cargo", "check", "--workspace", "--all-features", "--all-targets"])
     if res.returncode != 0:
         print("Failure while building code.\nCommit aborted.")
-        return
+        sys.exit(-1)
 
     print("Running `cargo test --workspace --all-features`...")
     res = subprocess.run(["cargo", "test", "--workspace", "--all-features"])

Cargo.lock

@@ -136,10 +136,10 @@ dependencies = [
  "calypso_filety",
  "calypso_parsing",
  "calypso_repl",
- "clap",
  "mimalloc",
  "once_cell",
  "saturnvm",
+ "structopt",
  "tracing-subscriber",
  "vergen",
 ]
@@ -282,7 +282,6 @@ dependencies = [
  "textwrap",
  "unicode-width",
  "vec_map",
- "yaml-rust",
 ]
 
 [[package]]
@@ -493,6 +492,15 @@ dependencies = [
  "ahash",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.18"
@@ -1171,6 +1179,30 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "structopt"
+version = "0.3.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69b041cdcb67226aca307e6e7be44c8806423d83e018bd662360a93dabce4d71"
+dependencies = [
+ "clap",
+ "lazy_static",
+ "structopt-derive",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7813934aecf5f51a54775e00068c237de98489463968231a51746bbbc03f9c10"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.73"
@@ -1493,9 +1525,3 @@ name = "wyz"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
-
-[[package]]
-name = "yaml-rust"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e66366e18dc58b46801afbf2ca7661a9f59cc8c5962c29892b6039b4f86fa992"

Cargo.toml

@@ -3,7 +3,7 @@ name = "calypso"
 version = "0.1.0"
 authors = ["ThePuzzlemaker <[email protected]>"]
 edition = "2018"
-description = "A (very work-in-progress) general-purpose interpreted language with built-in systems for cryptography, ciphers, and encodings, implemented with Rust."
+description = "Calypso is a mostly imperative language with some functional influences that is focused on flexibility and simplicity."
 readme = "README.md"
 homepage = "https://github.com/calypso-lang/calypso/"
 repository = "https://github.com/calypso-lang/calypso/"
@@ -13,7 +13,6 @@ categories = ["development-tools", "parser-implementations"]
 build = "build.rs"
 
 [dependencies]
-clap = { version = "2.33.3", features = ["yaml"] }
 mimalloc = { version = "0.1.26", optional = true }
 calypso_parsing = { path = "libs/calypso_parsing", version = "0.1.0" }
 calypso_diagnostic = { path = "libs/calypso_diagnostic", version = "0.1.0" }
@@ -24,6 +23,7 @@ tracing-subscriber = { version = "0.2.19", features = ["parking_lot"] }
 once_cell = "1.8.0"
 calypso_common = { path = "libs/calypso_common", version = "0.1.0" }
 calypso_filety = { path = "libs/calypso_filety", version = "2.0.0" }
+structopt = "0.3.22"
 
 [features]
 default = ["mimalloc", "mimalloc/secure"]

libs/calypso_diagnostic/src/lib.rs

@@ -17,4 +17,5 @@ pub mod prelude {
     pub use super::diagnostic::{self, EnsembleBuilder, LabelStyle};
     pub use super::err;
     pub use super::error::DiagnosticError;
+    pub use super::reporting::files::Files;
 }

libs/calypso_diagnostic/src/messages/E0001.md

@@ -24,7 +24,3 @@ itertools = "0.10.1"
 
 [build-dependencies]
 lalrpop = "0.19.5"
-
-[[example]]
-name = "expr_parser"
-path = "examples/expr_parser.rs"