add --fetch-grammars and --build-grammars CLI flags

helix-term/src/args.rs

@@ -9,6 +9,8 @@ pub struct Args {
     pub health: bool,
     pub health_arg: Option<String>,
     pub load_tutor: bool,
+    pub fetch_grammars: bool,
+    pub build_grammars: bool,
     pub verbosity: u64,
     pub files: Vec<(PathBuf, Position)>,
     pub edit_config: bool,
@@ -32,6 +34,8 @@ impl Args {
                     args.health = true;
                     args.health_arg = argv.next_if(|opt| !opt.starts_with('-'));
                 }
+                "--fetch-grammars" => args.fetch_grammars = true,
+                "--build-grammars" => args.build_grammars = true,
                 arg if arg.starts_with("--") => {
                     anyhow::bail!("unexpected double dash argument: {}", arg)
                 }

helix-term/src/main.rs

@@ -64,6 +64,8 @@ FLAGS:
     --tutor           Loads the tutorial
     --health [LANG]   Checks for potential errors in editor setup
                       If given, checks for config errors in language LANG
+    --fetch-grammars  Fetches tree-sitter grammars listed in languages.toml
+    --build-grammars  Builds tree-sitter grammars fetched with --fetch-grammars
     -v                Increases logging verbosity each use for up to 3 times
                       (default file: {})
     -V, --version     Prints version information