Migrated set-session-language from fuss-client

src/set-session-language.desktop

+[Desktop Entry]
+Type=Application
+Encoding=UTF-8
+Exec=set-session-language
+Name=Set Language for Next Session
+Terminal=False
+Categories=Settings;

src/set_session_language.py

+#!/usr/bin/env python3
+
+import os.path
+import subprocess
+import tkinter as tk
+
+from gettext import gettext as _
+
+
+class App(tk.Frame):
+    def __init__(self, master=None):
+        super().__init__(master)
+        self.master.title(_("Set session locale"))
+        self.chosen_locale = tk.StringVar(self)
+        self.find_locales()
+        self.pack()
+        self.create_widgets()
+
+    def find_locales(self):
+        res = locales = subprocess.run(
+            ['locale', '-a'],
+            stdout=subprocess.PIPE,
+            )
+
+        self.locales = []
+        for l in res.stdout.split(b'\n'):
+            if b'utf8' in l:
+                self.locales.append(l.decode())
+
+    def create_widgets(self):
+        self.text = tk.Label(
+            self,
+            text=_("Select the locale for your future sessions.")
+            )
+        self.text.pack(side="top")
+        self.chosen_locale.set(self.locales[0])
+        self.locale_menu = tk.OptionMenu(self, self.chosen_locale, *self.locales)
+        self.locale_menu.pack(side="top")
+
+        self.set_button = tk.Button(self)
+        self.set_button['text'] = "Set locale"
+        self.set_button['command'] = self.set_locale
+        self.set_button.pack(side="bottom")
+
+    def set_locale(self):
+        dmfname = os.path.expanduser('~/.dmrc')
+        lines = []
+        try:
+            with open(dmfname, 'r') as fp:
+                not_found = True
+                for l in fp.readlines():
+                    if l.startswith('Language'):
+                        lines.append(
+                            "Language={l}\n".format(l=self.chosen_locale.get())
+                            )
+                        not_found = False
+                    else:
+                        lines.append(l)
+                if not_found:
+                    lines.append(
+                        "Language={l}\n".format(l=self.chosen_locale.get())
+                        )
+        except FileNotFoundError:
+            lines = [
+                "[Desktop]\n",
+                "Language={l}\n".format(l=self.chosen_locale.get()),
+                ]
+
+        with open(dmfname, 'w') as wfp:
+            for l in lines:
+                wfp.write(l)
+
+        root.destroy()
+
+
+root = tk.Tk()
+app = App(master=root)
+app.mainloop()