Fix locale switching + Make the gettext Tera function work

po/en.po

@@ -3,14 +3,14 @@ msgstr ""
 "Project-Id-Version: plume\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2018-06-15 16:33-0700\n"
-"PO-Revision-Date: 2018-06-15 16:35+0100\n"
-"Last-Translator: baptiste <baptiste@gelez.xyz>\n"
-"Language-Team: English\n"
-"Language: en_US\n"
+"PO-Revision-Date: 2018-06-15 16:33-0700\n"
+"Last-Translator: Automatically generated\n"
+"Language-Team: none\n"
+"Language: en\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 
-msgid "Welcome on %s"
-msgstr "Welcome on %s"
+msgid "Welcome on {{ instance_name }}"
+msgstr "Welcome on {{ instance_name }}"

po/fr.po

@@ -12,5 +12,5 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
 
-msgid "Welcome on %s"
-msgstr ""
+msgid "Welcome on {{ instance_name }}"
+msgstr "Bienvenue sur {{ instance_name }}"

po/plume.pot

@@ -12,5 +12,5 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;\n"
 
-msgid "Welcome on %s"
+msgid "Welcome on {{ instance_name }}"
 msgstr ""

src/i18n.rs

@@ -2,6 +2,7 @@ use gettextrs::*;
 use rocket::{Data, Request, Rocket, fairing::{Fairing, Info, Kind}};
 use serde_json;
 use std::collections::HashMap;
+use std::env;
 use std::fs;
 use std::path::PathBuf;
 use tera::{Tera, Error as TeraError};
@@ -29,7 +30,7 @@ impl Fairing for I18n {
     }
 
     fn on_attach(&self, rocket: Rocket) -> Result<Rocket, Rocket> {
-        bindtextdomain(self.domain, fs::canonicalize(&PathBuf::from("./translations")).unwrap().to_str().unwrap());
+        bindtextdomain(self.domain, fs::canonicalize(&PathBuf::from("./translations/")).unwrap().to_str().unwrap());
         textdomain(self.domain);
         Ok(rocket)
     }
@@ -42,14 +43,21 @@ impl Fairing for I18n {
             .split(",")
             .nth(0)
             .unwrap_or("en");
-        setlocale(LocaleCategory::LcAll, format!("{}.UTF-8", lang.replace("-", "_")));
+        
+        // We can't use setlocale(LocaleCategory::LcAll, lang), because it only accepts system-wide installed
+        // locales (and most of the time there are only a few of them).
+        // But, when we set the LANGUAGE environment variable, and an empty string as a second parameter to
+        // setlocale, gettext will be smart enough to find a matching locale in the locally installed ones.
+        env::set_var("LANGUAGE", lang);
+        setlocale(LocaleCategory::LcAll, "");
     }
 }
 
 fn tera_gettext(ctx: HashMap<String, serde_json::Value>) -> Result<serde_json::Value, TeraError> {
-    Ok(serde_json::Value::String(String::from("")))
+    let trans = gettext(ctx.get("t").unwrap().as_str().unwrap());
+    Ok(serde_json::Value::String(Tera::one_off(trans.as_ref(), &ctx, false).unwrap_or(String::from(""))))
 }
 
 pub fn tera(t: &mut Tera) {
-    t.register_global_function("gettext", Box::new(tera_gettext))
+    t.register_global_function("_", Box::new(tera_gettext))
 }

templates/instance/index.html.tera

@@ -6,7 +6,7 @@
 {% endblock title %}
 
 {% block content %}
-    <h1>Welcome on {{ instance.name }}</h1>
+    <h1>{{ _(t="Welcome on {{ instance_name }}", instance_name=instance.name) }}</h1>
 
     <h2>Latest articles</h2>
     <div class="cards">