feat: Support completion generating

Fixes: #20

src/cli/completion_command.rs

@@ -0,0 +1,37 @@
+// Lprs - A local CLI vault manager
+// Copyright (C) 2024  Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.
+
+use std::io;
+
+use clap::{Args, CommandFactory};
+
+use crate::{cli::Cli, vault::Vaults, LprsCommand, LprsResult};
+
+
+/// Generate shell auto completion
+#[derive(Debug, Args)]
+pub struct Completion {
+    /// Shell to generate completion for
+    shell: clap_complete::Shell,
+}
+
+
+impl LprsCommand for Completion {
+    fn run(self, _vault_manager: Vaults) -> LprsResult<()> {
+        clap_complete::generate(self.shell, &mut Cli::command(), "lprs", &mut io::stdout());
+        Ok(())
+    }
+}

src/cli/mod.rs

@@ -25,6 +25,8 @@ use crate::{impl_commands, utils, vault::Vaults, LprsCommand, LprsResult};
 pub mod add_command;
 /// Clean command, used to clean the vaults file (remove all vaults)
 pub mod clean_command;
+/// Generate shell completion
+pub mod completion_command;
 /// Edit command, used to edit the vault content
 pub mod edit_command;
 /// Export command, used to export the vaults
@@ -65,9 +67,11 @@ pub enum Commands {
     Export(export_command::Export),
     /// Import vaults
     Import(import_command::Import),
+    /// Generate shell completion
+    Completion(completion_command::Completion),
 }
 
-impl_commands!(Commands, Add Remove List Clean Edit Gen Get Export Import);
+impl_commands!(Commands, Add Remove List Clean Edit Gen Get Export Import Completion);
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -116,7 +120,10 @@ impl Cli {
 
         self.command.validate_args()?;
 
-        let vault_manager = if matches!(self.command, Commands::Clean(..) | Commands::Gen(..)) {
+        let vault_manager = if matches!(
+            self.command,
+            Commands::Clean(..) | Commands::Gen(..) | Commands::Completion(..)
+        ) {
             log::info!("Running command that don't need the vault manager");
             // Returns empty vault manager for those commands don't need it
             Vaults {