i18n: bindtextdomain not hardcoded

I've added the locales path to the globals so we can now in the compile
time what directory is the translation to use in bindtextdomain

Closes World/fractal#89

README.md

@@ -34,6 +34,23 @@ ninja -C _build
 sudo ninja -C _build install
 ```
 
+### Translations
+
+If you want to add a new language you should update the file
+`fractal-gtk/po/LINUGAS` and add the new lang to the list.
+
+To generate .pot files you should run:
+
+```
+ninja -C _build fractal-pot
+```
+
+To generate .po files you should run:
+
+```
+ninja -C _build fractal-update-po
+```
+
 ### Password Storage
 
 Fractal uses Secret Service to store the password so you should have

fractal-gtk/build.rs

 use std::process::Command;
+use std::env;
+use std::fs::File;
+use std::path::Path;
+use std::io::Write;
 
 fn main() {
     // Compile Gresource
@@ -7,4 +11,17 @@ fn main() {
         .current_dir("res")
         .status()
         .unwrap();
+
+    // Generating build globals
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let localedir = env::var("FRACTAL_LOCALEDIR").unwrap();
+    let dest_path = Path::new(&out_dir).join("build_globals.rs");
+    let mut f = File::create(&dest_path).unwrap();
+
+    let globals = format!("
+pub static LOCALEDIR: &'static str = \"{}\";
+",
+        localedir);
+
+    f.write_all(&globals.into_bytes()[..]).unwrap();
 }

fractal-gtk/po/LINGUAS

 # please keep this list sorted alphabetically
 #
 fr
+es

fractal-gtk/src/app/mod.rs

@@ -83,7 +83,7 @@ impl App {
 
             // Set up the textdomain for gettext
             setlocale(LocaleCategory::LcAll, "");
-            bindtextdomain("fractal", "./fractal-gtk/po");
+            bindtextdomain("fractal", globals::LOCALEDIR);
             textdomain("fractal");
 
 

fractal-gtk/src/globals.rs

@@ -5,3 +5,5 @@ pub static USERLIST_ICON_SIZE: i32 = 30;
 pub static MINUTES_TO_SPLIT_MSGS: i64 = 30;
 pub static APP_ID: &'static str = "org.gnome.Fractal";
 
+
+include!(concat!(env!("OUT_DIR"), "/build_globals.rs"));

meson.build

@@ -12,6 +12,7 @@ fractal_version_micro = version_array[2].to_int()
 
 fractal_prefix = get_option('prefix')
 fractal_bindir = join_paths(fractal_prefix, get_option('bindir'))
+fractal_localedir = join_paths(fractal_prefix, get_option('localedir'))
 
 datadir = get_option('datadir')
 icondir = join_paths(datadir, 'icons')
@@ -37,7 +38,7 @@ cargo_release = custom_target('cargo-build',
                         output: ['fractal'],
                         install: true,
                         install_dir: fractal_bindir,
-                        command: [cargo_script, '@CURRENT_SOURCE_DIR@', '@OUTPUT@'])
+                        command: [cargo_script, '@CURRENT_SOURCE_DIR@', '@OUTPUT@', fractal_localedir])
 
 run_target('release', command: ['scripts/release.sh',
                                 meson.project_name() + '-' + fractal_version

scripts/cargo.sh

 #!/bin/sh
 
-export CARGO_HOME=$1/target/cargo-home
+export FRACTAL_LOCALEDIR="$3"
 
 if [[ $DEBUG = true ]]
 then