Complete recipes in bash completion script (#685)

Modifies the bash completion script to complete both recipes and flags.
`just <TAB>` will complete recipes, and `just -<TAB>` will complete
flags and options.

completions/just.bash

@@ -21,9 +21,15 @@ _just() {
     case "${cmd}" in
         just)
             opts=" -q -u -v -e -l -h -V -f -d -s  --dry-run --highlight --no-dotenv --no-highlight --quiet --clear-shell-args --unsorted --verbose --choose --dump --edit --evaluate --init --list --summary --variables --help --version --chooser --color --justfile --set --shell --shell-arg --working-directory --completions --show  <ARGUMENTS>... "
-            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
+                if [[ ${cur} == -* ]] ; then
                     COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                     return 0
+                elif [[ ${COMP_CWORD} -eq 1 ]]; then
+                    local recipes=$(just --summary --color never 2> /dev/null)
+                    if [[ $? -eq 0 ]]; then
+                        COMPREPLY=( $(compgen -W "${recipes}" -- "${cur}") )
+                        return 0
+                    fi
                 fi
             case "${prev}" in
                 

src/common.rs

@@ -18,14 +18,6 @@ pub(crate) use std::{
   usize, vec,
 };
 
-// modules used in tests
-#[cfg(test)]
-pub(crate) use crate::testing;
-
-// structs and enums used in tests
-#[cfg(test)]
-pub(crate) use crate::{node::Node, tree::Tree};
-
 // dependencies
 pub(crate) use derivative::Derivative;
 pub(crate) use edit_distance::edit_distance;
@@ -73,3 +65,11 @@ pub(crate) type CompilationResult<'a, T> = Result<T, CompilationError<'a>>;
 pub(crate) type ConfigResult<T> = Result<T, ConfigError>;
 pub(crate) type RunResult<'a, T> = Result<T, RuntimeError<'a>>;
 pub(crate) type SearchResult<T> = Result<T, SearchError>;
+
+// modules used in tests
+#[cfg(test)]
+pub(crate) use crate::testing;
+
+// structs and enums used in tests
+#[cfg(test)]
+pub(crate) use crate::{node::Node, tree::Tree};

src/subcommand.rs

@@ -113,8 +113,27 @@ _just "$@""#,
   ),
 ];
 
+const BASH_COMPLETION_REPLACEMENTS: &[(&str, &str)] = &[(
+  r#"            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
+                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
+                return 0
+            fi"#,
+  r#"                if [[ ${cur} == -* ]] ; then
+                    COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
+                    return 0
+                elif [[ ${COMP_CWORD} -eq 1 ]]; then
+                    local recipes=$(just --summary --color never 2> /dev/null)
+                    if [[ $? -eq 0 ]]; then
+                        COMPREPLY=( $(compgen -W "${recipes}" -- "${cur}") )
+                        return 0
+                    fi
+                fi"#,
+)];
+
 impl Subcommand {
   pub(crate) fn completions(shell: &str) -> Result<(), i32> {
+    use clap::Shell;
+
     fn replace(haystack: &mut String, needle: &str, replacement: &str) -> Result<(), i32> {
       if let Some(index) = haystack.find(needle) {
         haystack.replace_range(index..index + needle.len(), replacement);
@@ -129,7 +148,7 @@ impl Subcommand {
     }
 
     let shell = shell
-      .parse::<clap::Shell>()
+      .parse::<Shell>()
       .expect("Invalid value for clap::Shell");
 
     let buffer = Vec::new();
@@ -138,14 +157,19 @@ impl Subcommand {
     let buffer = cursor.into_inner();
     let mut script = String::from_utf8(buffer).expect("Clap completion not UTF-8");
 
-    if let clap::Shell::Zsh = shell {
+    match shell {
+      Shell::Bash =>
+        for (needle, replacement) in BASH_COMPLETION_REPLACEMENTS {
+          replace(&mut script, needle, replacement)?;
+        },
+      Shell::Fish => {
+        script.insert_str(0, FISH_RECIPE_COMPLETIONS);
+      },
+      Shell::Zsh =>
         for (needle, replacement) in ZSH_COMPLETION_REPLACEMENTS {
           replace(&mut script, needle, replacement)?;
-      }
-    }
-
-    if let clap::Shell::Fish = shell {
-      script.insert_str(0, FISH_RECIPE_COMPLETIONS);
+        },
+      _ => {},
     }
 
     println!("{}", script.trim());