feat(completions): Add shell completions files (#128)

* Add shell completions and output files to `assets/completions`

* Rename files and struct name

* Update tests to take into account new changes

1 files changed, 24 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 00000000..58430643
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,24 @@
+use std::fs;
+use structopt::clap::Shell;
+
+include!("src/cli.rs");
+
+const BIN_NAME: &str = "mosaic";
+
+fn main() {
+    let mut clap_app = CliArgs::clap();
+    println!("cargo:rerun-if-changed=src/app.rs");
+    let mut out_dir = std::env::var_os("CARGO_MANIFEST_DIR")
+        .unwrap()
+        .to_os_string();
+    out_dir.push("/assets/completions");
+
+    println!(
+        "Completion files will to added to this location: {:?}",
+        out_dir
+    );
+    fs::create_dir_all(&out_dir).unwrap();
+    clap_app.gen_completions(BIN_NAME, Shell::Bash, &out_dir);
+    clap_app.gen_completions(BIN_NAME, Shell::Zsh, &out_dir);
+    clap_app.gen_completions(BIN_NAME, Shell::Fish, &out_dir);
+}