feat(debug): Generalize debug commands

This is making room for more debug commands to be added while making
them selective disclosure.

BREAKING CHANGES: Debug flags have been relocated
- `cobalt --list-syntax-themes` -> `cobalt debug highlight themes`
- `cobalt --list-syntaxes` -> `cobalt debug highlight syntaxes`

src/bin/cobalt/debug.rs

@@ -0,0 +1,36 @@
+use clap;
+use cobalt;
+
+use error::*;
+
+pub fn debug_command_args() -> clap::App<'static, 'static> {
+ clap::SubCommand::with_name("debug")
+ .about("Print site debug information")
+ .subcommand(clap::SubCommand::with_name("highlight")
+ .about("Print syntax-highlight information")
+ .subcommand(clap::SubCommand::with_name("themes"))
+ .subcommand(clap::SubCommand::with_name("syntaxes")))
+}
+
+pub fn debug_command(matches: &clap::ArgMatches) -> Result<()> {
+ match matches.subcommand() {
+ ("highlight", Some(matches)) => {
+ match matches.subcommand() {
+ ("themes", _) => {
+ for name in cobalt::list_syntax_themes() {
+ println!("{}", name);
+ }
+ }
+ ("syntaxes", _) => {
+ for name in cobalt::list_syntaxes() {
+ println!("{}", name);
+ }
+ }
+ _ => bail!(matches.usage()),
+ }
+ }
+ _ => bail!(matches.usage()),
+ }
+
+ Ok(())
+}

src/bin/cobalt/main.rs

@@ -73,13 +73,13 @@ extern crate log;
 mod args;
 mod build;
 mod error;
+mod debug;
 mod jekyll;
 mod migrate;
 mod new;
 mod serve;
 
-use clap::{App, SubCommand, AppSettings};
-use cobalt::{list_syntaxes, list_syntax_themes};
+use clap::{App, AppSettings};
 
 use error::*;
 
@@ -100,10 +100,9 @@ fn run() -> Result<()> {
  .subcommand(build::clean_command_args())
  .subcommand(serve::serve_command_args())
  .subcommand(build::import_command_args())
- .subcommand(SubCommand::with_name("list-syntax-themes").about("list available themes"))
- .subcommand(SubCommand::with_name("list-syntaxes").about("list supported syntaxes"))
  .subcommand(migrate::migrate_command_args())
- .subcommand(jekyll::convert_command_args());
+ .subcommand(jekyll::convert_command_args())
+ .subcommand(debug::debug_command_args());
 
  let global_matches = app_cli.get_matches();
 
@@ -123,18 +122,7 @@ fn run() -> Result<()> {
  "clean" => build::clean_command(matches),
  "serve" => serve::serve_command(matches),
  "import" => build::import_command(matches),
- "list-syntax-themes" => {
- for name in list_syntax_themes() {
- println!("{}", name);
- }
- Ok(())
- }
- "list-syntaxes" => {
- for name in list_syntaxes() {
- println!("{}", name);
- }
- Ok(())
- }
+ "debug" => debug::debug_command(matches),
  "migrate" => migrate::migrate_command(matches),
  "convert-jekyll" => jekyll::convert_command(matches),
  _ => {