imp(Completions): allows multiple completions to be built by namespac…

…ing with bin name

Completions are now written `<bin>_<shell>.<ext>` vice the old, `<shell>.<ext>`

src/app/mod.rs

@@ -1015,7 +1015,7 @@ impl<'a, 'b> App<'a, 'b> {
     /// ```
     /// Now, once we combile there will be a `bash.sh` file in the directory. Assuming we compiled
     /// with debug mode, it would be somewhere similar to
-    /// `<project>/target/debug/build/myapp-<hash>/out/bash.sh`
+    /// `<project>/target/debug/build/myapp-<hash>/out/myapp_bash.sh`
     pub fn gen_completions<T: Into<OsString>, S: Into<String>>(&mut self, bin_name: S, for_shell: Shell, out_dir: T) {
         self.p.meta.bin_name = Some(bin_name.into());
         self.p.gen_completions(for_shell, out_dir.into());

src/completions.rs

@@ -39,7 +39,7 @@ impl<'a, 'b> ComplGen<'a, 'b> {
         use std::error::Error;
         let out_dir = PathBuf::from(&self.out_dir);
 
-        let mut file = match File::create(out_dir.join("bash.sh")) {
+        let mut file = match File::create(out_dir.join(format!("{}_bash.sh", &*self.p.meta.bin_name.as_ref().unwrap()))) {
             Err(why) => panic!("couldn't create bash completion file: {}",
                 why.description()),
             Ok(file) => file,