Allow --version and --help to be used even when missing a maskfile

Cargo.toml

@@ -17,6 +17,7 @@ path = "src/lib.rs"
 
 [dependencies]
 clap = "2.33.0"                                                         # https://github.com/clap-rs/clap
+colored = "1.8.0"                                                       # https://github.com/mackwic/colored
 pulldown-cmark = { version = "0.5", default-features = false }          # https://github.com/raphlinus/pulldown-cmark
 
 [dev-dependencies]

src/loader.rs

@@ -8,7 +8,7 @@ use std::path::Path;
 pub fn read_maskfile(maskfile: &Path) -> Result<String, String> {
     let file = File::open(maskfile);
     if file.is_err() {
-        return Err("Expected a maskfile.md to exist in the current directory.".to_string());
+        return Err("failed to open maskfile.md".to_string());
     }
 
     let mut file = file.unwrap();
@@ -47,7 +47,7 @@ mod read_maskfile {
 
         let err = maskfile.unwrap_err();
 
-        let expected_err = "Expected a maskfile.md to exist in the current directory.";
+        let expected_err = "failed to open maskfile.md";
         assert_eq!(err, expected_err, "error message was wrong");
     }
 }

src/main.rs

@@ -4,51 +4,73 @@ use std::path::Path;
 use clap::{
     crate_authors, crate_description, crate_name, crate_version, App, Arg, ArgMatches, SubCommand,
 };
+use colored::*;
 
 use mask::command::Command;
 
 fn main() {
-    let args: Vec<String> = env::args().collect();
-
-    let maybe_maskfile = args.get(1);
-    let maybe_path = args.get(2);
-
-    let maskfile_path = match (maybe_maskfile, maybe_path) {
-        (Some(a), Some(path)) if a == "--maskfile" => Path::new(path),
-        _ => Path::new("./maskfile.md"),
-    };
+    let cli_app = App::new(crate_name!())
+        .version(crate_version!())
+        .author(crate_authors!())
+        .about(crate_description!())
+        .arg(custom_maskfile_path_arg());
 
-    let maskfile = mask::loader::read_maskfile(maskfile_path);
+    let maskfile = find_maskfile();
     if maskfile.is_err() {
-        return eprintln!("ERROR: {}", maskfile.unwrap_err());
+        println!("{} no maskfile.md found", "WARNING:".yellow());
+        // If the maskfile can't be found, at least parse for --version or --help
+        cli_app.get_matches();
+        return;
     }
 
     let root_command = mask::parser::build_command_structure(maskfile.unwrap());
-
-    let cli_app = App::new(crate_name!())
-        .version(crate_version!())
-        .author(crate_authors!())
-        .about(crate_description!());
-
     let matches = build_subcommands(cli_app, &root_command.subcommands).get_matches();
-
     let chosen_cmd = find_command(&matches, &root_command.subcommands);
-
     if chosen_cmd.is_none() {
-        // TODO: echo --help for root command
-        println!("Missing SUBCOMMAND");
-        return;
+        // Exit with an error
+        eprintln!("{} missing subcommand", "ERROR:".red());
+        std::process::exit(1);
     }
 
     match mask::executor::execute_command(chosen_cmd.unwrap()) {
         Ok(status) => match status.code() {
             Some(code) => std::process::exit(code),
             None => return,
         },
-        Err(err) => eprintln!("ERROR: {}", err),
+        Err(err) => eprintln!("{} {}", "ERROR:".red(), err),
     }
 }
 
+fn find_maskfile() -> Result<String, String> {
+    let args: Vec<String> = env::args().collect();
+
+    let maybe_maskfile = args.get(1);
+    let maybe_path = args.get(2);
+
+    // Check for a custom --maskfile arg
+    let maskfile_path = match (maybe_maskfile, maybe_path) {
+        (Some(a), Some(path)) if a == "--maskfile" => Path::new(path),
+        _ => Path::new("./maskfile.md"),
+    };
+
+    let maskfile = mask::loader::read_maskfile(maskfile_path);
+
+    maskfile
+}
+
+fn custom_maskfile_path_arg<'a, 'b>() -> Arg<'a, 'b> {
+    // This is needed to prevent clap from complaining about the custom flag check
+    // within find_maskfile(). It should be removed once clap 3.x is released.
+    // See https://github.com/clap-rs/clap/issues/748
+    let custom_maskfile_path = Arg::with_name("maskfile")
+        .help("Path to a different maskfile you want to use")
+        .long("maskfile")
+        .takes_value(true)
+        .multiple(false);
+
+    custom_maskfile_path
+}
+
 fn build_subcommands<'a, 'b>(
     mut cli_app: App<'a, 'b>,
     subcommands: &'a Vec<Command>,
@@ -78,16 +100,7 @@ fn build_subcommands<'a, 'b>(
         cli_app = cli_app.subcommand(subcmd);
     }
 
-    // This is needed to prevent clap from complaining. It should be removed once
-    // clap 3.x is released. See https://github.com/clap-rs/clap/issues/748
-    let custom_maskfile_path = Arg::with_name("maskfile")
-        .help("Path to a different maskfile you want to use")
-        .short("m")
-        .long("maskfile")
-        .takes_value(true)
-        .multiple(false);
-
-    cli_app.arg(custom_maskfile_path)
+    cli_app
 }
 
 fn find_command<'a>(matches: &ArgMatches, subcommands: &Vec<Command>) -> Option<Command> {