correct commandline example

label listed updates in text output
ensure only one subprocess is running at a time
2023-09-23 11:39:15 +00:00 · 2023-07-21 14:02:12 +02:00 · 2023-07-21 12:52:51 +02:00 · 2023-07-20 20:49:36 +02:00 · 2023-07-20 17:49:03 +02:00 · 2023-07-20 09:57:56 +02:00
4 changed files with 320 additions and 117 deletions
--- a/README.md
+++ b/README.md
@ -8,10 +8,12 @@ A GUI for basic tasks of package management using apt:
 * Check for and list all available upgrades
 * Download and install all available upgrades

+![Screenshot](doc/screenshot.png "Screenshot: Updating the Package Cache")
+
 ## Dependencies

 ```shell
-apt install python3-gi
+sudo apt install python3-gi
 ```

 ## Installation
--- a/bin/simple-apt-update
+++ b/bin/simple-apt-update
@ -60,9 +60,8 @@ class UpdateWindow(Gtk.ApplicationWindow):
        self.buffer.set_text("")

    def scroll_to_bottom(self):
-        adj = self.scrolledwindow.get_vadjustment()
-        adj.set_value(adj.get_upper())
-        self.scrolledwindow.set_vadjustment(adj)
+        self.buffer.get_end_iter()
+        self.text_view.scroll_to_mark(self.text_mark_end, 0, False, 0, 0)

    def level_to_color(self, level):
        if level == "INFO":
@ -72,63 +71,104 @@ class UpdateWindow(Gtk.ApplicationWindow):
        else:
            return "grey"

-    def prepend_mesg(self, level, text):
-        self.prepend(text)
-        self.prepend_color(level + ": ", self.level_to_color(level))
-
    def append_mesg(self, level, text):
-        self.append_color(level + ": ", self.level_to_color(level))
+        self.append_color(
+            level + ": ",
+            self.level_to_color(level)
+        )
        self.append(text)

-    def prepend_markup(self, markup):
-        self.insert_markup(markup, self.buffer.get_start_iter())
-
    def append_markup(self, markup):
-        self.insert_markup(markup, self.buffer.get_end_iter())
+        self.insert_markup(
+            markup,
+            self.buffer.get_end_iter()
+        )

    def insert_markup(self, markup, iter):
        self.buffer.insert_markup(iter, markup, -1)

-    def prepend_color(self, text, color):
-        self.insert_color(text, color, self.buffer.get_start_iter())
-
    def append_color(self, text, color):
-        self.insert_color(text, color, self.buffer.get_end_iter())
+        self.insert_color(
+            text,
+            color,
+            self.buffer.get_end_iter()
+        )

    def insert_color(self, text, color, iter):
        self.buffer.insert_markup(
            iter,
-            "<span color=\"%s\">%s</span>" % (color, html.escape(text)),
+            "<span color=\"%s\">%s</span>" % (
+                color,
+                html.escape(text)),
            -1)

-    def prepend(self, text):
-        self.insert(text, self.buffer.get_start_iter())
-
    def append(self, text):
-        self.insert(text, self.buffer.get_end_iter())
+        self.insert(
+            text,
+            self.buffer.get_end_iter()
+        )
        self.scroll_to_bottom()

    def insert(self, text, iter):
        self.buffer.insert(iter, text + "\n")

-    def execute(self, args, ignore_stderr=False, output_msg=None,
-                empty_msg=None, env={}):
+    def run_thread(self, args, env, prefix=None):
+        if self.thread is None:
+            do_run = True
+        elif not self.thread.is_alive():
+            do_run = True
+        else:
+            do_run = False
+
+        if do_run:
+            self.thread = threading.Thread(
+                target=self.run,
+                args=(args, env, prefix,))
+
+            self.thread.start()
+
+            return False
+        else:
+            return True
+
+    def execute(
+        self,
+        args,
+        ignore_stderr=False,
+        output_msg=None,
+        empty_msg=None,
+        prefix=None,
+        env={},
+        clear=True
+    ):
        self.lock()
-        self.clear()
+
+        if clear:
+            self.clear()
+
        self.output_msg = output_msg
        self.empty_msg = empty_msg
        self.ignore_stderr = ignore_stderr
        self.stdout = ''
        self.stderr = ''
-        self.prepend_mesg(
+        self.append_mesg(
            "INFO",
            "Running command \"%s\" ..." % " ".join(args))
-        thread = threading.Thread(target=self.run, args=(args, env,))
-        thread.start()

-    def run(self, args, env={}):
+        GLib.timeout_add(
+            250,
+            self.run_thread,
+            args,
+            env,
+            prefix
+        )
+
+    def run(self, args, env={}, prefix=None):
        p = subprocess.Popen(
-            args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=False,
+            args,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            shell=False,
            env=dict(os.environ, **env))

        sel = selectors.DefaultSelector()
@ -142,7 +182,10 @@ class UpdateWindow(Gtk.ApplicationWindow):

                if data:
                    if key.fileobj is p.stdout:
-                        self.stdout_queue.put(data)
+                        if prefix is None:
+                            self.stdout_queue.put(data)
+                        else:
+                            self.stdout_queue.put(prefix + " " + data)
                    else:
                        self.stderr_queue.put(data)

@ -173,24 +216,32 @@ class UpdateWindow(Gtk.ApplicationWindow):
            env=env,
            empty_msg="No package upgrades were performed.")

-    def on_upgrade(self, *args):
-        self.upgrade()
-
-    def update(self):
+    def update(self, clear=True):
        args = ['/usr/bin/apt-get', '-y', 'update']
        env = {'DEBIAN_FRONTEND': 'noninteractive'}
-        self.execute(args, env=env)
+        self.execute(
+            args,
+            env=env,
+            clear=clear,
+            output_msg="The package cache was refreshed."
+        )

-    def on_update(self, *args):
-        self.update()
-
-    def list(self):
+    def list(self, clear=True):
        args = ['/usr/bin/apt', '-qq', 'list', '--upgradable']
        self.execute(
            args,
            ignore_stderr=True,
-            output_msg="Found the following package upgrades:",
-            empty_msg="Currently there are no available package upgrades.")
+            clear=clear,
+            prefix="UPDATE",
+            output_msg="Done listing available upgrades.",
+            empty_msg="No package upgrades found."
+        )
+
+    def on_update(self, *args):
+        self.update()
+
+    def on_upgrade(self, *args):
+        self.upgrade()

    def on_list(self, *args):
        self.list()
@ -198,28 +249,39 @@ class UpdateWindow(Gtk.ApplicationWindow):
    def on_quit(self, *args):
        self.application.quit()

+    def process_exit(self, exit_code, empty_msg=None, output_msg=None):
+        self.thread.join()
+
+        if exit_code != 0:
+            self.append_mesg(
+                "ERROR",
+                "Command exited with code %d" % exit_code
+            )
+        elif self.stdout == '' and self.empty_msg is not None:
+            self.append_mesg("INFO", self.empty_msg)
+        elif self.stdout != '' and self.output_msg is not None:
+            self.append_mesg("INFO", self.output_msg)
+
+        self.unlock()
+
    def update_buffer(self):
        try:
            text = self.stdout_queue.get(block=False)
+            match = re.fullmatch(r'(EXIT|UPDATE) (.*)', text)

-            self.stdout += text
-            self.append_mesg("STDOUT", text)
-
-            match = re.fullmatch(r'EXIT (\d+)', text)
-
-            if match is not None:
-                exit_code = int(match.group(1))
-
-                if exit_code != 0:
-                    self.append_mesg(
-                        "ERROR",
-                        "Command exited with code %d" % exit_code)
-                elif self.stdout == '' and self.empty_msg is not None:
-                    self.append_mesg("INFO", self.empty_msg)
-                elif self.stdout != '' and self.output_msg is not None:
-                    self.append_mesg("INFO", self.empty_msg)
-
-                self.unlock()
+            if match is None:
+                self.stdout += text
+                self.append_mesg("STDOUT", text)
+            elif match.group(1) == 'EXIT':
+                exit_code = int(match.group(2))
+                self.process_exit(exit_code)
+            elif match.group(1) == 'UPDATE':
+                text = match.group(2)
+                self.stdout += text
+                self.append_mesg("UPDATE", text)
+            else:
+                self.stdout += text
+                self.append_mesg("UPDATE", text)

        except queue.Empty:
            pass
@ -237,20 +299,31 @@ class UpdateWindow(Gtk.ApplicationWindow):
        return True

    def __init__(self, application):
-        super(UpdateWindow, self).__init__(
+        super(
+            UpdateWindow,
+            self
+        ).__init__(
            application=application,
-            title="Simple APT Update")
+            title="Simple APT Update"
+        )
+
        self.application = application
+        self.thread = None
        self.stdout_queue = queue.Queue()
        self.stderr_queue = queue.Queue()
-        GLib.timeout_add(100, self.update_buffer)
+
        self.init_ui()

+        GLib.timeout_add(100, self.update_buffer)
+
    def init_ui(self):
        self.set_border_width(10)
        self.set_default_size(630, 390)

-        hbox = Gtk.Box(spacing=6, orientation=Gtk.Orientation.VERTICAL)
+        hbox = Gtk.Box(
+            spacing=6,
+            orientation=Gtk.Orientation.VERTICAL
+        )
        self.add(hbox)

        grid = Gtk.Grid()
@ -269,9 +342,12 @@ class UpdateWindow(Gtk.ApplicationWindow):
        grid.attach(self.list_button, 1, 0, 1, 1)

        self.upgrade_button = Gtk.Button.new_from_icon_name(
-            "gtk-apply", Gtk.IconSize.BUTTON)
+            "gtk-apply",
+            Gtk.IconSize.BUTTON
+        )
        self.upgrade_button.set_tooltip_text(
-            "Download and install all available upgrades")
+            "Download and install all available upgrades"
+        )
        self.upgrade_button.connect("clicked", self.on_upgrade)
        grid.attach(self.upgrade_button, 2, 0, 1, 1)

@ -280,7 +356,9 @@ class UpdateWindow(Gtk.ApplicationWindow):
        grid.attach(self.spinner, 3, 0, 1, 1)

        self.quit_button = Gtk.Button.new_from_icon_name(
-            "exit", Gtk.IconSize.BUTTON)
+            "exit",
+            Gtk.IconSize.BUTTON
+        )
        self.quit_button.set_tooltip_text("Exit the program")
        self.quit_button.set_halign(Gtk.Align.END)
        self.quit_button.connect("clicked", self.on_quit)
@ -293,24 +371,32 @@ class UpdateWindow(Gtk.ApplicationWindow):
        self.scrolledwindow.set_max_content_height(300)
        self.buffer = Gtk.TextBuffer()

-        text_view = Gtk.TextView(buffer=self.buffer)
-        text_view.set_editable(False)
-        text_view.set_monospace(True)
-        text_view.set_cursor_visible(False)
+        self.text_view = Gtk.TextView(buffer=self.buffer)
+        self.text_view.set_editable(False)
+        self.text_view.set_monospace(True)
+        self.text_view.set_cursor_visible(False)

-        self.scrolledwindow.add(text_view)
+        text_buffer = self.text_view.get_buffer()
+        iter = text_buffer.get_end_iter()
+        self.text_mark_end = text_buffer.create_mark("", iter, False)
+
+        self.scrolledwindow.add(self.text_view)
        hbox.pack_start(self.scrolledwindow, True, True, 0)


 class SimpleAptUpdate(Gtk.Application):
    def __init__(self):
-        super().__init__(application_id='de.linuxfoo.SimpleAptUpdate',
-                         flags=Gio.ApplicationFlags.FLAGS_NONE)
-        self.connect('activate', self.on_activate)
-        signal.signal(signal.SIGINT, signal.SIG_DFL)
+        super(
+            SimpleAptUpdate,
+            self
+        ).__init__(
+            application_id='de.linuxfoo.SimpleAptUpdate',
+            flags=Gio.ApplicationFlags.FLAGS_NONE
+        )

-    def do_command_line(self, cmdline):
-        pass
+        self.connect('activate', self.on_activate)
+
+        signal.signal(signal.SIGINT, signal.SIG_DFL)

    def on_activate(self, application):
        self.window = UpdateWindow(application)
@ -318,7 +404,10 @@ class SimpleAptUpdate(Gtk.Application):
        action = Gio.SimpleAction.new("quit", None)
        action.connect("activate", self.window.on_quit)
        self.add_action(action)
-        self.set_accels_for_action('app.quit', ['<Primary>q', '<Primary>w'])
+        self.set_accels_for_action(
+            'app.quit',
+            ['<Primary>q', '<Primary>w']
+        )

        action = Gio.SimpleAction.new("update", None)
        action.connect("activate", self.window.on_update)
@ -337,6 +426,7 @@ class SimpleAptUpdate(Gtk.Application):

        self.window.present()
        self.window.show_all()
+        self.window.list(clear=False)


 ##
@ -350,3 +440,5 @@ def main():

 if __name__ == '__main__':
    main()
+
+# vim:fenc=utf-8:et:ts=4:sw=4
--- a/doc/screenshot.png
+++ b/doc/screenshot.png
--- a/res/icons/simple-apt-update.svg
+++ b/res/icons/simple-apt-update.svg
@ -1,40 +1,149 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!--part of the matt icon theme by sixsixfive released under CC0 (https://creativecommons.org/publicdomain/zero/1.0/) on openclipart-->
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 128 128">
- <defs id="0">
-  <linearGradient id="6">
-   <stop id="H" stop-opacity="0.306"/>
-   <stop offset="1" id="I" stop-opacity="0"/>
-  </linearGradient>
-  <linearGradient id="7">
-   <stop id="J" stop-opacity="0.754"/>
-   <stop offset="1" id="K" stop-opacity="0"/>
-  </linearGradient>
-  <linearGradient id="8">
-   <stop id="L" stop-color="#969696"/>
-   <stop offset="1" id="M" stop-color="#7b7b7b"/>
-  </linearGradient>
-  <linearGradient id="9">
-   <stop id="N" stop-color="#d6d6d6"/>
-   <stop offset="1" id="O" stop-color="#bcbcbc"/>
-  </linearGradient>
-  <linearGradient id="A">
-   <stop id="P" stop-color="#fff"/>
-   <stop id="Q" offset="0.099" stop-color="#fff" stop-opacity="0.28"/>
-   <stop offset="1" id="R" stop-color="#fff" stop-opacity="0"/>
-  </linearGradient>
-  <radialGradient xlink:href="#9" id="B" cx="72.06" cy="39.09" r="55.29" gradientTransform="matrix(1.0158202,-0.1265619,0.1233367,0.9899345,-5.960866,9.5726837)" gradientUnits="userSpaceOnUse"/>
-  <linearGradient xlink:href="#8" id="C" y1="5.062" x2="0" y2="122.29" gradientUnits="userSpaceOnUse"/>
-  <radialGradient xlink:href="#7" id="D" cx="64.47" cy="123.18" r="36.15" gradientTransform="matrix(1,0,0,0.1021597,0,110.59188)" gradientUnits="userSpaceOnUse"/>
-  <filter id="E" x="-0.057" width="1.114" y="-0.897" height="2.795">
-   <feGaussianBlur stdDeviation="1.63995" id="S"/>
-  </filter>
-  <radialGradient xlink:href="#6" id="F" cx="68.18" cy="125.16" r="55.29" gradientTransform="matrix(0.9999658,-8.2732372e-3,1.2111425e-2,1.4638781,-1.1101262,-42.162074)" gradientUnits="userSpaceOnUse"/>
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Author	SHA1	Message	Date
Tilman Kranz	84361afe5c	correct commandline example	2023-09-23 11:39:15 +00:00
Tilman Kranz	22a18a2069	label listed updates in text output	2023-07-21 14:02:12 +02:00
Tilman Kranz	943af1a316	ensure only one subprocess is running at a time	2023-07-21 12:52:51 +02:00
Tilman Kranz	94ebd86d35	optimized png for storage size	2023-07-20 20:49:36 +02:00
Tilman Kranz	4daa42e883	add screenshot	2023-07-20 17:49:03 +02:00
Tilman Kranz	106bd53a55	code formatting cleanup; vim modeline	2023-07-20 09:57:56 +02:00
Tilman Kranz	0caa892f25	improved output formatting	2023-07-20 08:02:45 +02:00
Tilman Kranz	5e8c57937f	new icon	2023-07-20 08:02:30 +02:00