Add --variables subcommand that prints variable names

.github/workflows/main.yaml

@@ -61,10 +61,7 @@ jobs:
     - name: Completion Scripts
       if: matrix.os != 'windows-latest'
       run: |
-        for script in completions/*; do
-          shell=${script##*.}
-          cargo run -- --completions $shell > $script
-        done
+        ./bin/generate-completions
         git diff --no-ext-diff --quiet --exit-code
     - name: Package
       id: package

bin/generate-completions

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+for script in completions/*; do
+  shell=${script##*.}
+  cargo run -- --completions $shell > $script
+done

completions/just.bash

@@ -20,7 +20,7 @@ _just() {
 
     case "${cmd}" in
         just)
-            opts=" -q -v -e -l -h -V -f -d -s  --dry-run --highlight --no-highlight --quiet --clear-shell-args --verbose --dump --edit --evaluate --init --list --summary --help --version --color --justfile --set --shell --shell-arg --working-directory --completions --show  <ARGUMENTS>... "
+            opts=" -q -v -e -l -h -V -f -d -s  --dry-run --highlight --no-highlight --quiet --clear-shell-args --verbose --dump --edit --evaluate --init --list --summary --variables --help --version --color --justfile --set --shell --shell-arg --working-directory --completions --show  <ARGUMENTS>... "
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0

completions/just.elvish

@@ -42,6 +42,7 @@ edit:completion:arg-completer[just] = [@words]{
             cand -l 'List available recipes and their arguments'
             cand --list 'List available recipes and their arguments'
             cand --summary 'List names of available recipes'
+            cand --variables 'List names of variables'
             cand -h 'Print help information'
             cand --help 'Print help information'
             cand -V 'Print version information'

completions/just.fish

@@ -18,5 +18,6 @@ complete -c just -n "__fish_use_subcommand" -l evaluate -d 'Print evaluated vari
 complete -c just -n "__fish_use_subcommand" -l init -d 'Initialize new justfile in project root'
 complete -c just -n "__fish_use_subcommand" -s l -l list -d 'List available recipes and their arguments'
 complete -c just -n "__fish_use_subcommand" -l summary -d 'List names of available recipes'
+complete -c just -n "__fish_use_subcommand" -l variables -d 'List names of variables'
 complete -c just -n "__fish_use_subcommand" -s h -l help -d 'Print help information'
 complete -c just -n "__fish_use_subcommand" -s V -l version -d 'Print version information'

completions/just.powershell

@@ -47,6 +47,7 @@ Register-ArgumentCompleter -Native -CommandName 'just' -ScriptBlock {
             [CompletionResult]::new('-l', 'l', [CompletionResultType]::ParameterName, 'List available recipes and their arguments')
             [CompletionResult]::new('--list', 'list', [CompletionResultType]::ParameterName, 'List available recipes and their arguments')
             [CompletionResult]::new('--summary', 'summary', [CompletionResultType]::ParameterName, 'List names of available recipes')
+            [CompletionResult]::new('--variables', 'variables', [CompletionResultType]::ParameterName, 'List names of variables')
             [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')

completions/just.zsh

@@ -42,6 +42,7 @@ _just() {
 '-l[List available recipes and their arguments]' \
 '--list[List available recipes and their arguments]' \
 '--summary[List names of available recipes]' \
+'--variables[List names of variables]' \
 '-h[Print help information]' \
 '--help[Print help information]' \
 '-V[Print version information]' \

justfile

@@ -157,6 +157,9 @@ watch-readme:
 	just render-readme
 	fswatch -ro README.adoc | xargs -n1 -I{} just render-readme
 
+generate-completions:
+	./bin/generate-completions
+
 # run all polyglot recipes
 polyglot: _python _js _perl _sh _ruby
 # (recipes that start with `_` are hidden from --list)

src/config.rs

@@ -23,17 +23,38 @@ pub(crate) struct Config {
 }
 
 mod cmd {
+  pub(crate) const COMPLETIONS: &str = "COMPLETIONS";
   pub(crate) const DUMP: &str = "DUMP";
   pub(crate) const EDIT: &str = "EDIT";
   pub(crate) const EVALUATE: &str = "EVALUATE";
   pub(crate) const INIT: &str = "INIT";
   pub(crate) const LIST: &str = "LIST";
   pub(crate) const SHOW: &str = "SHOW";
   pub(crate) const SUMMARY: &str = "SUMMARY";
-  pub(crate) const COMPLETIONS: &str = "COMPLETIONS";
-
-  pub(crate) const ALL: &[&str] = &[COMPLETIONS, DUMP, EDIT, INIT, EVALUATE, LIST, SHOW, SUMMARY];
-  pub(crate) const ARGLESS: &[&str] = &[COMPLETIONS, DUMP, EDIT, INIT, LIST, SHOW, SUMMARY];
+  pub(crate) const VARIABLES: &str = "VARIABLES";
+
+  pub(crate) const ALL: &[&str] = &[
+    COMPLETIONS,
+    DUMP,
+    EDIT,
+    INIT,
+    EVALUATE,
+    LIST,
+    SHOW,
+    SUMMARY,
+    VARIABLES,
+  ];
+
+  pub(crate) const ARGLESS: &[&str] = &[
+    COMPLETIONS,
+    DUMP,
+    EDIT,
+    INIT,
+    LIST,
+    SHOW,
+    SUMMARY,
+    VARIABLES,
+  ];
 }
 
 mod arg {
@@ -206,6 +227,11 @@ impl Config {
           .long("summary")
           .help("List names of available recipes"),
       )
+      .arg(
+        Arg::with_name(cmd::VARIABLES)
+          .long("variables")
+          .help("List names of variables"),
+      )
       .group(ArgGroup::with_name("SUBCOMMAND").args(cmd::ALL));
 
     if cfg!(feature = "help4help2man") {
@@ -345,6 +371,8 @@ impl Config {
         });
       }
       Subcommand::Evaluate { overrides }
+    } else if matches.is_present(cmd::VARIABLES) {
+      Subcommand::Variables
     } else {
       Subcommand::Run {
         arguments: positional.arguments,
@@ -419,13 +447,14 @@ impl Config {
     match &self.subcommand {
       Dump => Self::dump(justfile),
       Evaluate { overrides } => self.run(justfile, &search, overrides, &Vec::new()),
+      List => self.list(justfile),
       Run {
         arguments,
         overrides,
       } => self.run(justfile, &search, overrides, arguments),
-      List => self.list(justfile),
       Show { ref name } => Self::show(&name, justfile),
       Summary => Self::summary(justfile),
+      Variables => Self::variables(justfile),
       Completions { .. } | Edit | Init => unreachable!(),
     }
   }
@@ -635,6 +664,17 @@ impl Config {
     }
     Ok(())
   }
+
+  fn variables(justfile: Justfile) -> Result<(), i32> {
+    for (i, (_, assignment)) in justfile.assignments.iter().enumerate() {
+      if i > 0 {
+        print!(" ");
+      }
+      print!("{}", assignment.name)
+    }
+    println!();
+    Ok(())
+  }
 }
 
 #[cfg(test)]
@@ -668,6 +708,7 @@ FLAGS:
         --no-highlight        Don't highlight echoed recipe lines in bold
     -q, --quiet               Suppress all output
         --summary             List names of available recipes
+        --variables           List names of variables
     -v, --verbose             Use verbose output
 
 OPTIONS:

src/subcommand.rs

@@ -20,4 +20,5 @@ pub(crate) enum Subcommand {
     name: String,
   },
   Summary,
+  Variables,
 }

tests/integration.rs

@@ -2459,3 +2459,15 @@ test! {
   status: EXIT_SUCCESS,
   shell: false,
 }
+
+test! {
+  name: variables,
+  justfile: "
+    z := 'a'
+    a := 'z'
+  ",
+  args: ("--variables"),
+  stdout: "a z\n",
+  stderr: "",
+  shell: false,
+}