From 2f89d64837b74ed4d3f84f9a547024fdf864ba14 Mon Sep 17 00:00:00 2001
From: Guillaume Chereau <guillaume@noctua-software.com>
Date: Tue, 9 Jan 2024 23:10:23 +0800
Subject: [PATCH] Allow to change and save the language

---
 src/gui/settings.c | 26 +++++++++++++++++++++++++-
 src/i18n.c         | 43 ++++++++++++++++++++++++++++++++++++++++---
 src/i18n.h         |  9 +++++++++
 3 files changed, 74 insertions(+), 4 deletions(-)

diff --git a/src/gui/settings.c b/src/gui/settings.c
index f4bcae79d..011322745 100644
--- a/src/gui/settings.c
+++ b/src/gui/settings.c
@@ -42,8 +42,24 @@ int gui_settings_popup(void *data)
     int i, nb, current;
     theme_t *themes = theme_get_list();
     int ret = 0;
+    const tr_lang_t *language;
+    const tr_lang_t *languages;
+
+    if (gui_section_begin("Language", GUI_SECTION_COLLAPSABLE)) {
+        language = tr_get_language();
+        if (gui_combo_begin("##lang", language->name)) {
+            languages = tr_get_supported_languages();
+            for (i = 0; languages[i].id; i++) {
+                if (gui_combo_item(languages[i].name,
+                            &languages[i] == language)) {
+                    tr_set_language(languages[i].id);
+                }
+            }
+            gui_combo_end();
+        }
+    } gui_section_end();
 
-    if (gui_section_begin("Theme", GUI_SECTION_COLLAPSABLE_CLOSED)) {
+    if (gui_section_begin("Theme", GUI_SECTION_COLLAPSABLE)) {
         DL_COUNT(themes, theme, nb);
         names = (const char**)calloc(nb, sizeof(*names));
         i = 0;
@@ -88,6 +104,9 @@ static int settings_ini_handler(void *user, const char *section,
         if (strcmp(name, "theme") == 0) {
             theme_set(value);
         }
+        if (strcmp(name, "language") == 0) {
+            tr_set_language(value);
+        }
     }
     if (strcmp(section, "shortcuts") == 0) {
         if ((a = action_get_by_name(name))) {
@@ -118,7 +137,11 @@ void settings_save(void)
 {
     char path[1024];
     FILE *file;
+    const tr_lang_t *lang;
+
+    lang = tr_get_language();
     snprintf(path, sizeof(path), "%s/settings.ini", sys_get_user_dir());
+    LOG_I("Save settings to %s", path);
     sys_make_dir(path);
     file = fopen(path, "w");
     if (!file) {
@@ -127,6 +150,7 @@ void settings_save(void)
     }
     fprintf(file, "[ui]\n");
     fprintf(file, "theme=%s\n", theme_get()->name);
+    fprintf(file, "language=%s\n", lang->id);
 
     fprintf(file, "[shortcuts]\n");
     actions_iter(shortcut_save_callback, file);
diff --git a/src/i18n.c b/src/i18n.c
index 65d0b441f..b2793d22c 100644
--- a/src/i18n.c
+++ b/src/i18n.c
@@ -20,20 +20,57 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <string.h>
+
+static const tr_lang_t LANGUAGES[] = {
+    {"en", "English"},
+    {"fr", "Français"},
+    {}
+};
 
 typedef struct {
-    const char *en;
-    const char *fr;
+    union {
+        struct {
+            const char *en;
+            const char *fr;
+        };
+        const char *values[2];
+    };
 } string_t;
 
 static const string_t STRINGS[];
 
+static int current_lang_idx = 0;
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
 const char *tr(int id)
 {
     // Only return the English for now.
     if (!STRINGS[id].en) fprintf(stderr, "Str %d not defined.\n", id);
     assert(STRINGS[id].en);
-    return STRINGS[id].en;
+    return STRINGS[id].values[current_lang_idx];
+}
+
+void tr_set_language(const char *id)
+{
+    int i;
+    for (i = 0; i < ARRAY_SIZE(LANGUAGES); i++) {
+        if (strcmp(LANGUAGES[i].id, id) == 0) {
+            current_lang_idx = i;
+            break;
+        }
+    }
+}
+
+const tr_lang_t *tr_get_language(void)
+{
+    return &LANGUAGES[current_lang_idx];
+}
+
+const tr_lang_t *tr_get_supported_languages(void)
+{
+    return LANGUAGES;
 }
 
 static const string_t STRINGS[] = {
diff --git a/src/i18n.h b/src/i18n.h
index bfabebfac..8321df622 100644
--- a/src/i18n.h
+++ b/src/i18n.h
@@ -140,3 +140,12 @@ enum {
 const char *tr(int str);
 
 #define _(x) tr(STR_##x)
+
+typedef struct {
+    const char *id;
+    const char *name;
+} tr_lang_t;
+
+void tr_set_language(const char *id);
+const tr_lang_t *tr_get_language(void);
+const tr_lang_t *tr_get_supported_languages(void);