feat: add shell completions

Cargo.toml

@@ -19,6 +19,7 @@ members = [
 async-trait = "0.1"
 repos-github = { path = "common/repos-github" }
 clap = { version = "4.4", features = ["derive"] }
+clap_complete = "4.4"
 serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.9"
 serde_json = "1.0"

README.md

@@ -66,6 +66,38 @@ cargo build --release
 sudo cp target/release/repos /usr/local/bin/
 ```
 
+### Shell Completions
+
+`repos` can generate shell completions for zsh, bash, fish, PowerShell, and elvish.
+
+#### Zsh
+
+```bash
+# Generate completions
+repos completions zsh > ~/.zsh/completions/_repos
+
+# Or for Oh My Zsh
+mkdir -p ~/.oh-my-zsh/custom/plugins/repos-completions
+repos completions zsh > ~/.oh-my-zsh/custom/plugins/repos-completions/_repos
+
+# Add to your .zshrc
+fpath=(~/.zsh/completions $fpath)
+autoload -Uz compinit && compinit
+```
+
+#### Bash
+
+```bash
+repos completions bash > ~/.repos-completion.bash
+echo 'source ~/.repos-completion.bash' >> ~/.bashrc
+```
+
+#### Fish
+
+```bash
+repos completions fish > ~/.config/fish/completions/repos.fish
+```
+
 ## Quick Start
 
 The easiest way to get started is to let `repos` generate a configuration file

src/main.rs

@@ -1,8 +1,9 @@
 use anyhow::Result;
-use clap::{Parser, Subcommand};
+use clap::{CommandFactory, Parser, Subcommand};
+use clap_complete::{Shell, generate};
 use repos::commands::validators;
 use repos::{commands::*, config::Config, constants, plugins};
-use std::{env, path::PathBuf};
+use std::{env, io, path::PathBuf};
 
 #[derive(Parser)]
 #[command(name = "repos")]
@@ -193,6 +194,13 @@ enum Commands {
         supplement: bool,
     },
 
+    /// Generate shell completions
+    Completions {
+        /// Shell to generate completions for
+        #[arg(value_enum)]
+        shell: Shell,
+    },
+
     /// External plugin command
     #[command(external_subcommand)]
     External(Vec<String>),
@@ -221,6 +229,11 @@ async fn main() -> Result<()> {
 
     // Handle commands
     match cli.command {
+        Some(Commands::Completions { shell }) => {
+            let mut cmd = Cli::command();
+            generate(shell, &mut cmd, "repos", &mut io::stdout());
+            return Ok(());
+        }
         Some(Commands::External(args)) => {
             if args.is_empty() {
                 anyhow::bail!("External command provided but no arguments given");
@@ -502,6 +515,10 @@ async fn execute_builtin_command(command: Commands) -> Result<()> {
             .execute(&context)
             .await?;
         }
+        Commands::Completions { .. } => {
+            // Handled in main(), this should not be reached
+            unreachable!("Completions command should be handled in main()")
+        }
     }
 
     Ok(())