fix(builder): Fully recurse when building

Besides addressing the panic from assuming things were built when they
weren't, this should fix some completion issues for some people.

Fixes #3669

clap_complete/tests/snapshots/sub_subcommands.bash

@@ -73,7 +73,7 @@ _my-app() {
             return 0
             ;;
         my__app__some_cmd__help)
-            opts="-h -V --help --version <SUBCOMMAND>..."
+            opts="<SUBCOMMAND>..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 3 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0

clap_complete/tests/snapshots/sub_subcommands.elvish

@@ -53,10 +53,6 @@ set edit:completion:arg-completer[my-app] = {|@words|
             cand --version 'Print version information'
         }
         &'my-app;some_cmd;help'= {
-            cand -h 'Print help information'
-            cand --help 'Print help information'
-            cand -V 'Print version information'
-            cand --version 'Print version information'
         }
         &'my-app;help'= {
         }

clap_complete/tests/snapshots/sub_subcommands.fish

@@ -14,5 +14,3 @@ complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and not __fish_seen
 complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and __fish_seen_subcommand_from sub_cmd" -l config -d 'the other case to test' -r -f -a "{Lest quotes aren/'t escaped.	}"
 complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and __fish_seen_subcommand_from sub_cmd" -s h -l help -d 'Print help information'
 complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and __fish_seen_subcommand_from sub_cmd" -s V -l version -d 'Print version information'
-complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and __fish_seen_subcommand_from help" -s h -l help -d 'Print help information'
-complete -c my-app -n "__fish_seen_subcommand_from some_cmd; and __fish_seen_subcommand_from help" -s V -l version -d 'Print version information'

clap_complete/tests/snapshots/sub_subcommands.ps1

@@ -60,10 +60,6 @@ Register-ArgumentCompleter -Native -CommandName 'my-app' -ScriptBlock {
             break
         }
         'my-app;some_cmd;help' {
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help information')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help information')
-            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version information')
-            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version information')
             break
         }
         'my-app;help' {

clap_complete/tests/snapshots/sub_subcommands.zsh

@@ -70,10 +70,6 @@ _arguments "${_arguments_options[@]}" /
 ;;
 (help)
 _arguments "${_arguments_options[@]}" /
-'-h[Print help information]' /
-'--help[Print help information]' /
-'-V[Print version information]' /
-'--version[Print version information]' /
 '*::subcommand -- The subcommand whose help message to display:' /
 && ret=0
 ;;

clap_complete_fig/tests/snapshots/sub_subcommands.fig.js

@@ -56,16 +56,6 @@ const completion: Fig.Spec = {
         {
           name: "help",
           description: "Print this message or the help of the given subcommand(s)",
-          options: [
-            {
-              name: ["-h", "--help"],
-              description: "Print help information",
-            },
-            {
-              name: ["-V", "--version"],
-              description: "Print version information",
-            },
-          ],
           args: {
             name: "subcommand",
             isOptional: true,

src/build/command.rs

@@ -4008,11 +4008,15 @@ impl<'help> App<'help> {
     /// Call this on the top-level [`Command`] when done building and before reading state for
     /// cases like completions, custom help output, etc.
     pub fn build(&mut self) {
+        self._build_recursive();
+        self._build_bin_names_internal();
+    }
+
+    pub(crate) fn _build_recursive(&mut self) {
         self._build_self();
         for subcmd in self.get_subcommands_mut() {
-            subcmd._build_self();
+            subcmd._build_recursive();
         }
-        self._build_bin_names_internal();
     }
 
     pub(crate) fn _build_self(&mut self) {

tests/builder/tests.rs

@@ -408,3 +408,19 @@ fn mut_arg_all() {
         cmd = cmd.mut_arg(arg_name, |arg| arg.hide_possible_values(true));
     }
 }
+
+#[test]
+fn issue_3669_command_build_recurses() {
+    let mut cmd = Command::new("ctest").subcommand(
+        Command::new("subcmd").subcommand(
+            Command::new("multi")
+                .about("tests subcommands")
+                .author("Kevin K. <kbknapp@gmail.com>")
+                .version("0.1")
+                .arg(clap::arg!(
+                    <FLAG>                    "tests flags"
+                )),
+        ),
+    );
+    cmd.build();
+}