Separate CLI + auto-generate completion at build time

5 files changed, 96 insertions, 57 deletions

diff --git a/Cargo.toml b/Cargo.toml
index e60c8dd..337fb06 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,10 @@ authors = ["Minijackson <minijackson@riseup.net>"]
 
 [build-dependencies]
 lalrpop = "0.15.2"
+clap = "*"
+clap-verbosity-flag = "0.2"
+clap-log-flag = "0.1"
+structopt = "0.2"
 
 [dependencies]
 dbus = "0.6.2"
diff --git a/build.rs b/build.rs
index 23c7d3f..b797f9a 100644
--- a/build.rs
+++ b/build.rs
@@ -1,5 +1,28 @@
 extern crate lalrpop;
 
+#[macro_use]
+extern crate clap;
+extern crate clap_log_flag;
+extern crate clap_verbosity_flag;
+#[macro_use]
+extern crate structopt;
+
+use structopt::StructOpt;
+
+use clap::Shell;
+
+use std::env;
+
+#[path = "src/cli.rs"]
+mod cli;
+
 fn main() {
     lalrpop::process_root().unwrap();
+
+    let outdir = env::var_os("OUT_DIR").expect("OUT_DIR environment variable not defined");
+
+    let mut app = cli::Cli::clap();
+    app.gen_completions("set_eq", Shell::Bash, &outdir);
+    app.gen_completions("set_eq", Shell::Fish, &outdir);
+    app.gen_completions("set_eq", Shell::Zsh, &outdir);
 }
diff --git a/derivation.nix b/derivation.nix
index 329ef3b..b895bb8 100644
--- a/derivation.nix
+++ b/derivation.nix
@@ -9,6 +9,13 @@ rustPlatform.buildRustPackage rec {
   src = ./.;
   cargoSha256 = "0lknxqr1pfbj6z981rw5ppkklknryyafl5f552aaw4iqhq94slq4";
 
+  preFixup = ''
+    mkdir -p "$out/share/"{bash-completion/completions,fish/vendor_completions.d,zsh/site-functions}
+    cp target/release/build/set_eq-*/out/set_eq.bash "$out/share/bash-completion/completions/"
+    cp target/release/build/set_eq-*/out/set_eq.fish "$out/share/fish/vendor_completions.d/"
+    cp target/release/build/set_eq-*/out/_set_eq     "$out/share/zsh/site-functions/"
+  '';
+
   meta = with stdenv.lib; {
     description = "A command-line tool to manipulate PulseAudio's equalizer";
     homepage = https://github.com/minijackson/set_eq;
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..f24b222
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,59 @@
+use clap_verbosity_flag;
+use clap_log_flag;
+use structopt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(raw(setting = "structopt::clap::AppSettings::ColoredHelp"))]
+/// Hello World! How are you doing?
+pub struct Cli {
+    #[structopt(flatten)]
+    pub verbose: clap_verbosity_flag::Verbosity,
+    #[structopt(flatten)]
+    pub log: clap_log_flag::Log,
+    #[structopt(short = "s")]
+    /// Use the given sink.
+    ///
+    /// By default it will use the last equalized sink it finds
+    pub sink: Option<String>,
+    #[structopt(subcommand)]
+    pub cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+pub enum Command {
+    #[structopt(name = "load",)]
+    /// Load and switch to a given equalizer configuration
+    Load(LoadCli),
+    #[structopt(name = "reset")]
+    /// Switch to a neutral equalizer
+    Reset(ResetCli),
+}
+
+#[derive(StructOpt, Debug)]
+pub struct LoadCli {
+    #[structopt(default_value = "-")]
+    /// The file from which to load the equalizer configuration
+    ///
+    /// If "-" is given, read the configuration from the command-line.
+    pub file: String,
+    #[structopt(
+        short = "f",
+        raw(
+            possible_values = "&EqualizerConfFormat::variants()",
+            case_insensitive = "true"
+        ),
+        default_value = "EqualizerAPO"
+    )]
+    /// The file format of the equalizer configuration
+    pub format: EqualizerConfFormat,
+}
+
+arg_enum! {
+    #[derive(Debug)]
+    pub enum EqualizerConfFormat {
+        EqualizerAPO
+    }
+}
+
+#[derive(StructOpt, Debug)]
+pub struct ResetCli {}
diff --git a/src/main.rs b/src/main.rs
index 360117c..85d2443 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,75 +14,21 @@ extern crate structopt;
 
 extern crate lalrpop_util;
 
+mod cli;
 mod dbus_api;
 mod parsing;
 mod utils;
 
 use utils::*;
-
 use dbus_api::sink::OrgPulseAudioExtEqualizing1Equalizer;
+use cli::*;
+
 use failure::Error;
 use structopt::StructOpt;
 
 use std::fs::File;
 use std::io;
 
-#[derive(StructOpt, Debug)]
-#[structopt(raw(setting = "structopt::clap::AppSettings::ColoredHelp"))]
-/// Hello World! How are you doing?
-struct Cli {
-    #[structopt(flatten)]
-    verbose: clap_verbosity_flag::Verbosity,
-    #[structopt(flatten)]
-    log: clap_log_flag::Log,
-    #[structopt(short = "s")]
-    /// Use the given sink.
-    ///
-    /// By default it will use the last equalized sink it finds
-    sink: Option<String>,
-    #[structopt(subcommand)]
-    cmd: Command,
-}
-
-#[derive(StructOpt, Debug)]
-enum Command {
-    #[structopt(name = "load",)]
-    /// Load and switch to a given equalizer configuration
-    Load(LoadCli),
-    #[structopt(name = "reset")]
-    /// Switch to a neutral equalizer
-    Reset(ResetCli),
-}
-
-#[derive(StructOpt, Debug)]
-struct LoadCli {
-    #[structopt(default_value = "-")]
-    /// The file from which to load the equalizer configuration
-    ///
-    /// If "-" is given, read the configuration from the command-line.
-    file: String,
-    #[structopt(
-        short = "f",
-        raw(
-            possible_values = "&EqualizerConfFormat::variants()",
-            case_insensitive = "true"
-        ),
-        default_value = "EqualizerAPO"
-    )]
-    /// The file format of the equalizer configuration
-    format: EqualizerConfFormat,
-}
-
-arg_enum! {
-    #[derive(Debug)]
-    enum EqualizerConfFormat {
-        EqualizerAPO
-    }
-}
-
-#[derive(StructOpt, Debug)]
-struct ResetCli {}
-
 #[derive(Debug)]
 pub struct Filter {
     preamp: f64,