Allow for nested subcommands with ZSH generation.

clap_generate/src/generators/shells/zsh.rs

@@ -119,7 +119,8 @@ _{bin_name_underscore}_commands() {{
 }}",
             bin_name_underscore = bin_name.replace(" ", "__"),
             bin_name = bin_name,
-            subcommands_and_args = subcommands_of(parser_of(p, bin_name))
+            subcommands_and_args =
+                subcommands_of(parser_of(p, bin_name).expect(INTERNAL_ERROR_MSG))
         ));
     }
 
@@ -217,14 +218,20 @@ fn get_subcommands_of(p: &App) -> String {
     let mut subcmds = vec![];
 
     for &(ref name, ref bin_name) in &sc_names {
+        debug!(
+            "get_subcommands_of:iter: p={}, name={}, bin_name={}",
+            p.get_name(),
+            name,
+            bin_name,
+        );
         let mut v = vec![format!("({})", name)];
-        let subcommand_args = get_args_of(parser_of(p, &*bin_name));
+        let subcommand_args = get_args_of(parser_of(p, &*bin_name).expect(INTERNAL_ERROR_MSG));
 
         if !subcommand_args.is_empty() {
             v.push(subcommand_args);
         }
 
-        let subcommands = get_subcommands_of(parser_of(p, &*bin_name));
+        let subcommands = get_subcommands_of(parser_of(p, &*bin_name).expect(INTERNAL_ERROR_MSG));
 
         if !subcommands.is_empty() {
             v.push(subcommands);
@@ -252,15 +259,24 @@ esac",
     )
 }
 
-fn parser_of<'help, 'app>(p: &'app App<'help>, mut sc: &str) -> &'app App<'help> {
-    debug!("parser_of: sc={}", sc);
+// Get the App for a given subcommand tree.
+//
+// Given the bin_name "a b c" and the App for "a" this returns the "c" App.
+// Given the bin_name "a b c" and the App for "b" this returns the "c" App.
+fn parser_of<'help, 'app>(p: &'app App<'help>, bin_name: &str) -> Option<&'app App<'help>> {
+    debug!("parser_of: p={}, bin_name={}", p.get_name(), bin_name);
 
-    if sc == p.get_bin_name().unwrap_or(&String::new()) {
-        return p;
+    if bin_name == p.get_bin_name().unwrap_or(&String::new()) {
+        return Some(p);
     }
 
-    sc = sc.split(' ').last().unwrap();
-    p.find_subcommand(sc).expect(INTERNAL_ERROR_MSG)
+    for sc in p.get_subcommands() {
+        if let Some(ret) = parser_of(sc, bin_name) {
+            return Some(ret);
+        }
+    }
+
+    None
 }
 
 // Writes out the args section, which ends up being the flags, opts and positionals, and a jump to

clap_generate/tests/completions.rs

@@ -712,6 +712,108 @@ _my_app_commands() {
 
 _my_app "$@""#;
 
+static ZSH_NESTED_SUBCOMMANDS: &str = r#"#compdef my_app
+
+autoload -U is-at-least
+
+_my_app() {
+    typeset -A opt_args
+    typeset -a _arguments_options
+    local ret=1
+
+    if is-at-least 5.2; then
+        _arguments_options=(-s -S -C)
+    else
+        _arguments_options=(-s -C)
+    fi
+
+    local context curcontext="$curcontext" state line
+    _arguments "${_arguments_options[@]}" \
+'-h[Prints help information]' \
+'--help[Prints help information]' \
+'-V[Prints version information]' \
+'--version[Prints version information]' \
+":: :_my_app_commands" \
+"*::: :->first" \
+&& ret=0
+    case $state in
+    (first)
+        words=($line[1] "${words[@]}")
+        (( CURRENT += 1 ))
+        curcontext="${curcontext%:*:*}:my_app-command-$line[1]:"
+        case $line[1] in
+            (second)
+_arguments "${_arguments_options[@]}" \
+'-h[Prints help information]' \
+'--help[Prints help information]' \
+'-V[Prints version information]' \
+'--version[Prints version information]' \
+":: :_my_app__second_commands" \
+"*::: :->second" \
+&& ret=0
+case $state in
+    (second)
+        words=($line[1] "${words[@]}")
+        (( CURRENT += 1 ))
+        curcontext="${curcontext%:*:*}:my_app-second-command-$line[1]:"
+        case $line[1] in
+            (third)
+_arguments "${_arguments_options[@]}" \
+'-h[Prints help information]' \
+'--help[Prints help information]' \
+'-V[Prints version information]' \
+'--version[Prints version information]' \
+&& ret=0
+;;
+        esac
+    ;;
+esac
+;;
+(help)
+_arguments "${_arguments_options[@]}" \
+'-h[Prints help information]' \
+'--help[Prints help information]' \
+'-V[Prints version information]' \
+'--version[Prints version information]' \
+&& ret=0
+;;
+        esac
+    ;;
+esac
+}
+
+(( $+functions[_my_app_commands] )) ||
+_my_app_commands() {
+    local commands; commands=(
+        "second:" \
+"help:Prints this message or the help of the given subcommand(s)" \
+    )
+    _describe -t commands 'my_app commands' commands "$@"
+}
+(( $+functions[_my_app__help_commands] )) ||
+_my_app__help_commands() {
+    local commands; commands=(
+        
+    )
+    _describe -t commands 'my_app help commands' commands "$@"
+}
+(( $+functions[_my_app__second_commands] )) ||
+_my_app__second_commands() {
+    local commands; commands=(
+        "third:" \
+    )
+    _describe -t commands 'my_app second commands' commands "$@"
+}
+(( $+functions[_my_app__second__third_commands] )) ||
+_my_app__second__third_commands() {
+    local commands; commands=(
+        
+    )
+    _describe -t commands 'my_app second third commands' commands "$@"
+}
+
+_my_app "$@""#;
+
 fn build_app() -> App<'static> {
     build_app_with_name("myapp")
 }
@@ -777,6 +879,10 @@ fn build_app_special_help() -> App<'static> {
         )
 }
 
+fn build_app_nested_subcommands() -> App<'static> {
+    App::new("first").subcommand(App::new("second").subcommand(App::new("third")))
+}
+
 pub fn common<G: Generator>(app: &mut App, name: &str, fixture: &str) {
     let mut buf = vec![];
     generate::<G, _>(app, name, &mut buf);
@@ -856,3 +962,9 @@ fn zsh_with_special_help() {
     let mut app = build_app_special_help();
     common::<Zsh>(&mut app, "my_app", ZSH_SPECIAL_HELP);
 }
+
+#[test]
+fn zsh_with_nested_subcommands() {
+    let mut app = build_app_nested_subcommands();
+    common::<Zsh>(&mut app, "my_app", ZSH_NESTED_SUBCOMMANDS);
+}

src/build/app/mod.rs

@@ -263,6 +263,8 @@ impl<'help> App<'help> {
     }
 
     /// Find subcommand such that its name or one of aliases equals `name`.
+    ///
+    /// This does not recurse through subcommands of subcommands.
     #[inline]
     pub fn find_subcommand<T>(&self, name: &T) -> Option<&App<'help>>
     where