Use git describe version (fix #191)

Cargo.toml

@@ -57,6 +57,7 @@ winres = "0.1"
 
 [build-dependencies]
 phf_codegen = "0.7"
+build-version = "0.1.1"
 
 [dependencies.pango]
 features = ["v1_38"]

build.rs

@@ -1,4 +1,5 @@
 extern crate phf_codegen;
+extern crate build_version;
 
 #[cfg(windows)]
 extern crate winres;
@@ -9,6 +10,8 @@ use std::io::{BufWriter, Write};
 use std::path::Path;
 
 fn main() {
+    build_version::write_version_file().expect("Failed to write version.rs file");
+
     if cfg!(target_os = "windows") {
         println!("cargo:rustc-link-search=native=C:\\msys64\\mingw64\\lib");
 

src/main.rs

@@ -78,11 +78,13 @@ use ui::Ui;
 use clap::{App, Arg, ArgMatches};
 use shell::ShellOptions;
 
+include!(concat!(env!("OUT_DIR"), "/version.rs"));
+
 fn main() {
     env_logger::init();
 
     let matches = App::new("NeovimGtk")
-        .version(env!("CARGO_PKG_VERSION"))
+        .version(GIT_BUILD_VERSION.unwrap_or(env!("CARGO_PKG_VERSION")))
         .author(env!("CARGO_PKG_AUTHORS"))
         .about(misc::about_comments().as_str())
         .arg(Arg::with_name("no-fork")

src/ui.rs

@@ -434,7 +434,7 @@ fn on_help_about(window: &gtk::ApplicationWindow) {
     let about = AboutDialog::new();
     about.set_transient_for(window);
     about.set_program_name("NeovimGtk");
-    about.set_version(env!("CARGO_PKG_VERSION"));
+    about.set_version(::GIT_BUILD_VERSION.unwrap_or(env!("CARGO_PKG_VERSION")));
     about.set_logo_icon_name("org.daa.NeovimGtk");
     about.set_authors(&[env!("CARGO_PKG_AUTHORS")]);
     about.set_comments(misc::about_comments().as_str());