Hook up -C/--config-file option

All it does is parsing, but it's a start

cli/src/args.rs

@@ -23,6 +23,7 @@ impl Clap3Compat for Arg<'_, '_> {}
 
 const OPTSET_FILTERING: &str = "Filtering options:";
 const OPTSET_COMMAND: &str = "Command options:";
+const OPTSET_CONFIG: &str = "Config file options:";
 const OPTSET_DEBUGGING: &str = "Debugging options:";
 const OPTSET_OUTPUT: &str = "Output options:";
 const OPTSET_BEHAVIOUR: &str = "Behaviour options:";
@@ -32,6 +33,12 @@ pub fn get_args(tagged_filterer: bool) -> Result<ArgMatches<'static>> {
 		.version(crate_version!())
 		.about("Execute commands when watched files change")
 		.after_help("Use @argfile as first argument to load arguments from the file `argfile` (one argument per line) which will be inserted in place of the @argfile (further arguments on the CLI will override or add onto those in the file).")
+		.arg(Arg::with_name("config-file")
+			.help_heading(Some(OPTSET_CONFIG))
+			.help("Config file(s) to use")
+			.multiple(true)
+			.short("C")
+			.long("config"))
 		.arg(Arg::with_name("command")
 			.help_heading(Some(OPTSET_COMMAND))
 			.help("Command to execute")

cli/src/config/file.rs

@@ -199,10 +199,7 @@ mod tests {
 			config.commands[0].run.as_ref().unwrap().shell,
 			Shell::default()
 		);
-		assert_eq!(
-			config.commands[0].run.as_ref().unwrap().shell,
-			Shell::None
-		);
+		assert_eq!(config.commands[0].run.as_ref().unwrap().shell, Shell::None);
 	}
 
 	#[test]

cli/src/main.rs

@@ -1,6 +1,8 @@
 use std::env::var;
 
-use miette::{IntoDiagnostic, Result};
+use miette::{IntoDiagnostic, Result, WrapErr};
+use tokio::fs::read_to_string;
+use tracing::debug;
 use watchexec::{event::Event, Watchexec};
 
 mod args;
@@ -47,6 +49,21 @@ async fn main() -> Result<()> {
 		}
 	}
 
+	let mut configs = Vec::with_capacity(
+		args.occurrences_of("config-file")
+			.try_into()
+			.into_diagnostic()
+			.wrap_err("Too many config files")?,
+	);
+	// TODO: look for global/project config file
+	for path in args.values_of("config-file").unwrap_or_default() {
+		let content = read_to_string(path).await.into_diagnostic()?;
+		configs.push(config::File::parse(&content)?);
+	}
+	debug!(?configs, "loaded config files");
+	// TODO: merge configs
+	// TODO: use configs
+
 	let init = config::init(&args)?;
 	let mut runtime = config::runtime(&args)?;
 	runtime.filterer(if tagged_filterer {

cli/tests/snapshots/help__help_unix.snap

@@ -12,6 +12,7 @@ USAGE:
 
 FLAGS:
     -c, --clear                Clear screen before executing command
+    -C, --config               Config file(s) to use
     -h, --help                 Prints help information
         --no-default-ignore    Skip auto-ignoring of commonly ignored globs
         --no-environment       Do not set WATCHEXEC_*_PATH environment variables for the command

cli/tests/snapshots/help__help_windows.snap

@@ -11,6 +11,7 @@ USAGE:
 
 FLAGS:
     -c, --clear                Clear screen before executing command
+    -C, --config               Config file(s) to use
     -h, --help                 Prints help information
         --no-default-ignore    Skip auto-ignoring of commonly ignored globs
         --no-environment       Do not set WATCHEXEC_*_PATH environment variables for the command