feat: add command to generate completion (#33)

src/cli.rs

@@ -18,12 +18,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-use clap::{Command, CommandFactory, Parser, Subcommand};
-
-#[allow(dead_code)]
-fn build_cli() -> Command {
-    Cli::command()
-}
+use clap::{Parser, Subcommand};
+use clap_complete::Shell;
 
 #[derive(Parser)]
 #[command(author, version, about)]
@@ -35,6 +31,12 @@ pub struct Cli {
 
 #[derive(Subcommand)]
 pub enum SubCommand {
+    #[command(
+        name = "completion",
+        about = "Erzeuge und gebe Command-Completion aus",
+        hide = true
+    )]
+    Completion { shell: Shell },
     #[command(
         name = "sha256sum",
         about = "Berechne SHA256 Prüfsumme für die angegebene Datei"

src/commands.rs

@@ -18,6 +18,18 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+use crate::checks::{check_file, print_checks, CheckNotice};
+use crate::cli::{Cli, SubCommand};
+use crate::file_io::{FileError, FileReader, InputFile};
+use crate::model::onkostar_editor::OnkostarEditor;
+use crate::profile::Profile;
+use clap::CommandFactory;
+use clap_complete::generate;
+use console::style;
+use dialoguer::Confirm;
+use quick_xml::se::Serializer;
+use serde::Serialize;
+use sha256::digest;
 use std::error::Error;
 use std::fs;
 use std::fs::OpenOptions;
@@ -25,18 +37,6 @@ use std::io::Write;
 use std::ops::Add;
 use std::path::{Path, PathBuf};
 
-use console::style;
-use dialoguer::Confirm;
-use quick_xml::se::Serializer;
-use serde::Serialize;
-use sha256::digest;
-
-use crate::checks::{check_file, print_checks, CheckNotice};
-use crate::cli::SubCommand;
-use crate::file_io::{FileError, FileReader, InputFile};
-use crate::model::onkostar_editor::OnkostarEditor;
-use crate::profile::Profile;
-
 fn write_outputfile(filename: String, content: &String) -> Result<(), FileError> {
     OpenOptions::new()
         .read(false)
@@ -52,6 +52,15 @@ fn write_outputfile(filename: String, content: &String) -> Result<(), FileError>
 
 pub fn handle(command: SubCommand) -> Result<(), Box<dyn Error>> {
     match command {
+        SubCommand::Completion { shell } => {
+            let command = &mut Cli::command();
+            generate(
+                shell,
+                command,
+                command.get_name().to_string(),
+                &mut std::io::stdout(),
+            );
+        }
         SubCommand::List {
             inputfile,
             sorted,