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authorWu Xiaotian <[email protected]>2019-07-03 15:14:35 +0800
committerraveit65 <[email protected]>2019-07-08 14:45:56 +0200
commitda78059c5598bdf66828edd1081d3c1ca0f4805b (patch)
treecb020d7de0cf87f014340757a3aea07f252e5bdb
parentb1006a885a586233e2cc682f4c86d569d7398306 (diff)
downloadmate-applets-da78059c5598bdf66828edd1081d3c1ca0f4805b.tar.bz2
mate-applets-da78059c5598bdf66828edd1081d3c1ca0f4805b.tar.xz
command: use MaCommand object
-rw-r--r--command/Makefile.am2
-rw-r--r--command/command.c282
-rw-r--r--command/ma-command.c417
-rw-r--r--command/ma-command.h43
4 files changed, 610 insertions, 134 deletions
diff --git a/command/Makefile.am b/command/Makefile.am
index 76fe2497..2a9115d9 100644
--- a/command/Makefile.am
+++ b/command/Makefile.am
@@ -8,7 +8,7 @@ AM_CPPFLAGS = \
APPLET_LOCATION = $(libexecdir)/command-applet
libexec_PROGRAMS = command-applet
-command_applet_SOURCES = command.c
+command_applet_SOURCES = command.c ma-command.c ma-command.h
command_applet_LDADD = $(MATE_APPLETS4_LIBS) $(MATEDESKTOP_LIBS)
command_applet_CFLAGS = $(WARN_CFLAGS)
diff --git a/command/command.c b/command/command.c
index 2cd3c00c..f62f2325 100644
--- a/command/command.c
+++ b/command/command.c
@@ -32,6 +32,7 @@
#include <mate-panel-applet.h>
#include <mate-panel-applet-gsettings.h>
+#include "ma-command.h"
/* Applet constants */
#define APPLET_ICON "utilities-terminal"
@@ -54,14 +55,15 @@ typedef struct
MatePanelApplet *applet;
GSettings *settings;
- GPid child_pid;
- gchar *buffer;
GtkLabel *label;
GtkImage *image;
GtkBox *box;
+ MaCommand *command;
+ GCancellable *cancellable;
+ gboolean running;
- gchar *command;
+ gchar *cmdline;
gint interval;
gint width;
@@ -71,6 +73,11 @@ typedef struct
static void command_about_callback (GtkAction *action, CommandApplet *command_applet);
static void command_settings_callback (GtkAction *action, CommandApplet *command_applet);
static gboolean command_execute (CommandApplet *command_applet);
+static gboolean command_text_changed (GtkWidget *widget, GdkEvent *event, gpointer user_data);
+static void interval_value_changed (GtkSpinButton *spin_button, gpointer user_data);
+static void width_value_changed (GtkSpinButton *spin_button, gpointer user_data);
+static void command_async_ready_callback (GObject *source_object, GAsyncResult *res, gpointer user_data);
+static gboolean timeout_callback (CommandApplet *command_applet);
static const GtkActionEntry applet_menu_actions [] = {
{ "Preferences", "document-properties", N_("_Preferences"), NULL, NULL, G_CALLBACK (command_settings_callback) },
@@ -91,22 +98,15 @@ command_applet_destroy (MatePanelApplet *applet_widget, CommandApplet *command_a
command_applet->timeout_id = 0;
}
- if (command_applet->command != NULL)
- {
- g_free (command_applet->command);
- command_applet->command = NULL;
- }
-
- if (command_applet->child_pid != 0)
+ if (command_applet->cmdline != NULL)
{
- g_spawn_close_pid (command_applet->child_pid);
- command_applet->child_pid = 0;
+ g_free (command_applet->cmdline);
+ command_applet->cmdline = NULL;
}
- if (command_applet->buffer != NULL)
+ if (command_applet->command != NULL)
{
- g_free (command_applet->buffer);
- command_applet->buffer = NULL;
+ g_object_unref (command_applet->command);
}
g_object_unref (command_applet->settings);
@@ -127,7 +127,56 @@ command_about_callback (GtkAction *action, CommandApplet *command_applet)
"comments", _("Shows the output of a command"),
"translator-credits", _("translator-credits"),
"logo-icon-name", APPLET_ICON,
- NULL );
+ NULL );
+}
+
+static gboolean
+command_text_changed (GtkWidget *widget, GdkEvent *event, gpointer user_data)
+{
+ const gchar *text;
+ CommandApplet *command_applet;
+
+ command_applet = (CommandApplet*) user_data;
+ text = gtk_entry_get_text (GTK_ENTRY(widget));
+ if (g_strcmp0(command_applet->cmdline, text) == 0) {
+ return TRUE;
+ }
+
+ if (strlen (text) == 0) {
+ gtk_label_set_text (command_applet->label, ERROR_OUTPUT);
+ return TRUE;
+ }
+
+ g_settings_set_string (command_applet->settings, COMMAND_KEY, text);
+ return TRUE;
+}
+
+static void interval_value_changed (GtkSpinButton *spin_button, gpointer user_data)
+{
+ gint value;
+ CommandApplet *command_applet;
+
+ command_applet = (CommandApplet*) user_data;
+ value = gtk_spin_button_get_value_as_int (spin_button);
+ if (command_applet->interval == value) {
+ return;
+ }
+
+ g_settings_set_int (command_applet->settings, INTERVAL_KEY, value);
+}
+
+static void width_value_changed (GtkSpinButton *spin_button, gpointer user_data)
+{
+ gint value;
+ CommandApplet *command_applet;
+
+ command_applet = (CommandApplet*) user_data;
+ value = gtk_spin_button_get_value_as_int (spin_button);
+ if (command_applet->width == value) {
+ return;
+ }
+
+ g_settings_set_int (command_applet->settings, WIDTH_KEY, value);
}
/* Show the preferences dialog */
@@ -186,10 +235,13 @@ command_settings_callback (GtkAction *action, CommandApplet *command_applet)
g_signal_connect (dialog, "response", G_CALLBACK (gtk_widget_destroy), dialog);
+ g_signal_connect(command, "focus-out-event", G_CALLBACK (command_text_changed), command_applet);
+ g_signal_connect(interval, "value-changed", G_CALLBACK (interval_value_changed), command_applet);
+ g_signal_connect(width, "value-changed", G_CALLBACK (width_value_changed), command_applet);
/* use g_settings_bind to manage settings */
- g_settings_bind (command_applet->settings, COMMAND_KEY, command, "text", G_SETTINGS_BIND_DEFAULT);
- g_settings_bind (command_applet->settings, INTERVAL_KEY, interval, "value", G_SETTINGS_BIND_DEFAULT);
- g_settings_bind (command_applet->settings, WIDTH_KEY, width, "value", G_SETTINGS_BIND_DEFAULT);
+ g_settings_bind (command_applet->settings, COMMAND_KEY, command, "text", G_SETTINGS_BIND_GET_NO_CHANGES);
+ g_settings_bind (command_applet->settings, INTERVAL_KEY, interval, "value", G_SETTINGS_BIND_GET_NO_CHANGES);
+ g_settings_bind (command_applet->settings, WIDTH_KEY, width, "value", G_SETTINGS_BIND_GET_NO_CHANGES);
g_settings_bind (command_applet->settings, SHOW_ICON_KEY, showicon, "active", G_SETTINGS_BIND_DEFAULT);
gtk_widget_show_all (GTK_WIDGET (dialog));
@@ -199,17 +251,27 @@ command_settings_callback (GtkAction *action, CommandApplet *command_applet)
static void
settings_command_changed (GSettings *settings, gchar *key, CommandApplet *command_applet)
{
- gchar *command;
+ GError *error = NULL;
+ gchar *cmdline;
+ gchar **argv;
- command = g_settings_get_string (command_applet->settings, COMMAND_KEY);
+ cmdline = g_settings_get_string (command_applet->settings, COMMAND_KEY);
+ if (strlen (cmdline) == 0 || g_strcmp0(command_applet->cmdline, cmdline) == 0)
+ return;
+
+ if (!g_shell_parse_argv (cmdline, NULL, &argv, &error))
+ {
+ gtk_label_set_text (command_applet->label, ERROR_OUTPUT);
+ g_clear_error (&error);
+ return;
+ }
+ g_strfreev(argv);
- if (command_applet->command)
- g_free (command_applet->command);
+ if (command_applet->cmdline)
+ g_free (command_applet->cmdline);
+ command_applet->cmdline = cmdline;
- if (command != NULL && command[0] != 0)
- command_applet->command = command;
- else
- command_applet->command = g_strdup ("");
+ command_execute (command_applet);
}
static void
@@ -219,10 +281,9 @@ settings_width_changed (GSettings *settings, gchar *key, CommandApplet *command_
width = g_settings_get_int (command_applet->settings, WIDTH_KEY);
- command_applet->width = width;
-
- /* execute command to start new timer */
- command_execute (command_applet);
+ if (command_applet->width != width) {
+ command_applet->width = width;
+ }
}
static void
@@ -236,23 +297,18 @@ settings_interval_changed (GSettings *settings, gchar *key, CommandApplet *comma
if (interval < 1)
interval = 1;
- command_applet->interval = interval;
-
- /* stop current timer */
- if (command_applet->timeout_id != 0)
- {
- g_source_remove (command_applet->timeout_id);
- command_applet->timeout_id = 0;
+ if (command_applet->interval == interval) {
+ return;
}
+ command_applet->interval = interval;
- /* execute command to start new timer */
command_execute (command_applet);
}
static void
process_command_output (CommandApplet *command_applet, gchar *output)
{
- gtk_widget_set_tooltip_text (GTK_WIDGET (command_applet->label), command_applet->command);
+ gtk_widget_set_tooltip_text (GTK_WIDGET (command_applet->label), command_applet->cmdline);
if ((output == NULL) || (output[0] == '\0'))
{
@@ -301,121 +357,82 @@ process_command_output (CommandApplet *command_applet, gchar *output)
}
}
-static gboolean
-stdout_io_func (GIOChannel *ioc, GIOCondition cond, gpointer data)
+static void command_async_ready_callback (GObject *source_object, GAsyncResult *res, gpointer user_data)
{
+ gchar *output;
+ GError *error = NULL;
CommandApplet *command_applet;
- command_applet = data;
- if (cond & (G_IO_IN | G_IO_PRI))
- {
- if (strlen (command_applet->buffer) == 0)
- {
- GError *error = NULL;
- GIOStatus ret;
- gsize len = 0;
+ command_applet = (CommandApplet*) user_data;
- ret = g_io_channel_read_chars (ioc, command_applet->buffer, command_applet->width, &len, &error);
- if (len <= 0 || ret != G_IO_STATUS_NORMAL)
- {
- g_clear_error (&error);
- return FALSE;
- }
- process_command_output (command_applet, command_applet->buffer);
+ output = ma_command_run_finish (command_applet->command, res, &error);
+ if (error == NULL) {
+ process_command_output (command_applet, output);
+ } else {
+ if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_FAILED)) {
+ gtk_label_set_text (command_applet->label, ERROR_OUTPUT);
}
- return FALSE;
+ g_error_free (error);
}
-
- if (cond & (G_IO_ERR | G_IO_HUP | G_IO_NVAL))
- return FALSE;
-
- return TRUE;
+ g_free (output);
+ command_applet->running = FALSE;
}
-static void
-on_child_exit (GPid child_pid, gint status, gpointer data)
+static gboolean timeout_callback (CommandApplet *command_applet)
{
- CommandApplet *command_applet;
-
- command_applet = data;
- g_spawn_close_pid (child_pid);
- command_applet->child_pid = 0;
-}
-
-static void
-set_up_io_channel (gint fd, GIOCondition cond, GIOFunc func, gpointer data)
-{
- GIOChannel *ioc;
-
- ioc = g_io_channel_unix_new (fd);
-
- g_io_channel_set_encoding (ioc, NULL, NULL);
- g_io_channel_set_buffered (ioc, FALSE);
-
- g_io_channel_set_close_on_unref (ioc, TRUE);
+ /* command is empty, wait for next timer execution */
+ if (strlen (command_applet->cmdline) == 0) {
+ return G_SOURCE_CONTINUE;
+ }
- g_io_add_watch (ioc, cond, func, data);
- g_io_channel_unref (ioc);
+ /* command running, wait for next timer execution */
+ if (command_applet->running) {
+ return G_SOURCE_CONTINUE;
+ } else {
+ gchar **argv;
+ GError *error = NULL;
+ if (!g_shell_parse_argv (command_applet->cmdline, NULL, &argv, &error)) {
+ gtk_label_set_text (command_applet->label, ERROR_OUTPUT);
+ g_clear_error (&error);
+ return G_SOURCE_CONTINUE;
+ }
+ g_strfreev(argv);
+ command_execute (command_applet);
+ return G_SOURCE_REMOVE;
+ }
}
static gboolean
command_execute (CommandApplet *command_applet)
{
- GError *error = NULL;
- gchar **argv;
- gint stdout_fd;
-
- /* command is empty, wait for next timer execution */
- if (strlen (command_applet->command) == 0)
+ /* stop current timer */
+ if (command_applet->timeout_id != 0)
{
- return TRUE;
+ g_source_remove (command_applet->timeout_id);
+ command_applet->timeout_id = 0;
}
- /* command running, wait for next timer execution */
- if (command_applet->child_pid != 0)
- {
- return TRUE;
+ if (command_applet->running) {
+ g_cancellable_cancel (command_applet->cancellable);
}
- if (!g_shell_parse_argv (command_applet->command, NULL, &argv, &error))
- {
- gtk_label_set_text (command_applet->label, ERROR_OUTPUT);
- g_clear_error (&error);
- return FALSE;
+ g_object_set (G_OBJECT(command_applet->command), "command", command_applet->cmdline, NULL);
+ ma_command_run_async (command_applet->command,
+ command_applet->cancellable,
+ command_async_ready_callback,
+ command_applet);
+ if (!command_applet->running) {
+ command_applet->running = TRUE;
}
- if (!g_spawn_async_with_pipes (NULL,
- argv,
- NULL,
- G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
- NULL,
- NULL,
- &command_applet->child_pid,
- NULL,
- &stdout_fd,
- NULL,
- &error))
- {
- g_clear_error (&error);
- g_strfreev (argv);
- return TRUE;
+ if (g_cancellable_is_cancelled (command_applet->cancellable)) {
+ g_cancellable_reset (command_applet->cancellable);
}
- g_free(command_applet->buffer);
- command_applet->buffer = g_new0(gchar, command_applet->width+1);
-
- set_up_io_channel (stdout_fd, G_IO_IN|G_IO_PRI|G_IO_ERR|G_IO_HUP|G_IO_NVAL,
- stdout_io_func, command_applet);
-
- if (command_applet->child_pid != (GPid) 0)
- g_child_watch_add (command_applet->child_pid, on_child_exit, command_applet);
-
- /* start timer for next execution */
command_applet->timeout_id = g_timeout_add_seconds (command_applet->interval,
- (GSourceFunc) command_execute,
+ (GSourceFunc) timeout_callback,
command_applet);
- g_strfreev (argv);
- return FALSE;
+ return G_SOURCE_CONTINUE;
}
static gboolean
@@ -434,15 +451,15 @@ command_applet_fill (MatePanelApplet* applet)
command_applet->settings = mate_panel_applet_settings_new (applet, COMMAND_SCHEMA);
command_applet->interval = g_settings_get_int (command_applet->settings, INTERVAL_KEY);
- command_applet->command = g_settings_get_string (command_applet->settings, COMMAND_KEY);
+ command_applet->cmdline = g_settings_get_string (command_applet->settings, COMMAND_KEY);
command_applet->width = g_settings_get_int (command_applet->settings, WIDTH_KEY);
+ command_applet->command = ma_command_new(command_applet->cmdline, NULL);
+ command_applet->cancellable = g_cancellable_new ();
command_applet->box = GTK_BOX (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0));
command_applet->image = GTK_IMAGE (gtk_image_new_from_icon_name (APPLET_ICON, 24));
command_applet->label = GTK_LABEL (gtk_label_new (ERROR_OUTPUT));
command_applet->timeout_id = 0;
- command_applet->child_pid = 0;
- command_applet->buffer = NULL;
/* we add the Gtk label into the applet */
gtk_box_pack_start (command_applet->box,
@@ -489,7 +506,6 @@ command_applet_fill (MatePanelApplet* applet)
/* first command execution */
command_execute (command_applet);
-
return TRUE;
}
diff --git a/command/ma-command.c b/command/ma-command.c
new file mode 100644
index 00000000..da0e8795
--- /dev/null
+++ b/command/ma-command.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) 2018 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include "ma-command.h"
+
+#define BUFFER_SIZE 64
+
+struct _MaCommand
+{
+ GObject parent;
+
+ gchar *command;
+ gchar **argv;
+};
+
+typedef struct
+{
+ GPid pid;
+
+ GIOChannel *channel;
+
+ GString *input;
+
+ guint io_watch_id;
+ guint child_watch_id;
+} CommandData;
+
+enum
+{
+ PROP_0,
+
+ PROP_COMMAND,
+
+ LAST_PROP
+};
+
+static GParamSpec *command_properties[LAST_PROP] = { NULL };
+
+static void initable_iface_init (GInitableIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (MaCommand, ma_command, G_TYPE_OBJECT,
+ G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
+ initable_iface_init))
+
+static gboolean
+read_cb (GIOChannel *source,
+ GIOCondition condition,
+ gpointer user_data)
+{
+ GTask *task;
+ CommandData *data;
+ gchar buffer[BUFFER_SIZE];
+ gsize bytes_read;
+ GError *error;
+ GIOStatus status;
+
+ task = (GTask *) user_data;
+ data = g_task_get_task_data (task);
+
+ if (g_task_return_error_if_cancelled (task))
+ {
+ g_object_unref (task);
+
+ data->io_watch_id = 0;
+
+ return G_SOURCE_REMOVE;
+ }
+
+ error = NULL;
+ status = g_io_channel_read_chars (source, buffer, BUFFER_SIZE,
+ &bytes_read, &error);
+
+ if (status == G_IO_STATUS_AGAIN)
+ {
+ g_clear_error (&error);
+
+ return G_SOURCE_CONTINUE;
+ }
+ else if (status != G_IO_STATUS_NORMAL)
+ {
+ if (error != NULL)
+ {
+ g_task_return_error (task, error);
+ g_object_unref (task);
+ }
+
+ data->io_watch_id = 0;
+
+ return G_SOURCE_REMOVE;
+ }
+
+ g_string_append_len (data->input, buffer, bytes_read);
+
+ return G_SOURCE_CONTINUE;
+}
+
+static void
+child_watch_cb (GPid pid,
+ gint status,
+ gpointer user_data)
+{
+ GTask *task;
+ CommandData *data;
+
+ task = (GTask *) user_data;
+ data = g_task_get_task_data (task);
+
+ g_task_return_pointer (task, g_strdup (data->input->str), g_free);
+ g_object_unref (task);
+}
+
+static void
+cancelled_cb (GCancellable *cancellable,
+ gpointer user_data)
+{
+ GTask *task;
+
+ task = G_TASK (user_data);
+
+ g_object_unref (task);
+}
+
+static void
+command_data_free (gpointer user_data)
+{
+ CommandData *data;
+
+ data = (CommandData *) user_data;
+
+ if (data->pid != 0)
+ {
+ g_spawn_close_pid (data->pid);
+ data->pid = 0;
+ }
+
+ if (data->channel != NULL)
+ {
+ g_io_channel_unref (data->channel);
+ data->channel = NULL;
+ }
+
+ if (data->input != NULL)
+ {
+ g_string_free (data->input, TRUE);
+ data->input = NULL;
+ }
+
+ if (data->io_watch_id != 0)
+ {
+ g_source_remove (data->io_watch_id);
+ data->io_watch_id = 0;
+ }
+
+ if (data->child_watch_id != 0)
+ {
+ g_source_remove (data->child_watch_id);
+ data->child_watch_id = 0;
+ }
+
+ g_free (data);
+}
+
+static gboolean
+ma_command_initable_init (GInitable *initable,
+ GCancellable *cancellable,
+ GError **error)
+{
+ MaCommand *command;
+
+ command = MA_COMMAND (initable);
+
+ if (command->command == NULL || *command->command == '\0')
+ {
+ g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA,
+ "Empty command");
+
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static void
+initable_iface_init (GInitableIface *iface)
+{
+ iface->init = ma_command_initable_init;
+}
+
+static void
+ma_command_finalize (GObject *object)
+{
+ MaCommand *command;
+
+ command = MA_COMMAND (object);
+
+ g_clear_pointer (&command->command, g_free);
+ g_clear_pointer (&command->argv, g_strfreev);
+
+ G_OBJECT_CLASS (ma_command_parent_class)->finalize (object);
+}
+
+static void
+ma_command_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ MaCommand *command;
+
+ command = MA_COMMAND (object);
+
+ switch (property_id)
+ {
+ case PROP_COMMAND:
+ //g_assert (command->command == NULL);
+ command->command = g_value_dup_string (value);
+ if (command->argv && *command->argv != NULL) {
+ g_strfreev(command->argv);
+ }
+ g_shell_parse_argv (command->command, NULL, &command->argv, NULL);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+ma_command_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+ MaCommand *command;
+
+ command = MA_COMMAND (object);
+
+ switch (prop_id)
+ {
+ case PROP_COMMAND:
+ g_value_set_string (value, command->command);
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+install_properties (GObjectClass *object_class)
+{
+ command_properties[PROP_COMMAND] =
+ g_param_spec_string ("command", "command", "command",
+ NULL,
+ G_PARAM_READWRITE);
+
+ g_object_class_install_properties (object_class, LAST_PROP,
+ command_properties);
+}
+
+static void
+ma_command_class_init (MaCommandClass *command_class)
+{
+ GObjectClass *object_class;
+
+ object_class = G_OBJECT_CLASS (command_class);
+
+ object_class->finalize = ma_command_finalize;
+ object_class->set_property = ma_command_set_property;
+ object_class->get_property = ma_command_get_property;
+
+ install_properties (object_class);
+}
+
+static void
+ma_command_init (MaCommand *command)
+{
+}
+
+/**
+ * ma_command_new:
+ * @command: a command
+ * @error: (nullable): return location for an error, or %NULL
+ *
+ * Creates a new #MaCommand.
+ *
+ * Returns: (nullable): a newly allocated #MaCommand
+ */
+MaCommand *
+ma_command_new (const gchar *command,
+ GError **error)
+{
+ return g_initable_new (MA_TYPE_COMMAND, NULL, error,
+ "command", command,
+ NULL);
+}
+
+/**
+ * ma_command_run_async:
+ * @command: a #MaCommand
+ * @cancellable: (nullable): a #GCancellable or %NULL
+ * @callback: a #GAsyncReadyCallback to call when the request is satisfied
+ * @user_data: the data to pass to @callback
+ *
+ * Request an asynchronous read of output from command that was passed
+ * to ma_command_new().
+ */
+void
+ma_command_run_async (MaCommand *command,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ GTask *task;
+ CommandData *data;
+ GSpawnFlags spawn_flags;
+ gint command_stdout;
+ GError *error;
+ GIOChannel *channel;
+ GIOStatus status;
+ GIOCondition condition;
+
+ g_return_if_fail (MA_IS_COMMAND (command));
+ g_return_if_fail (callback != NULL);
+
+ task = g_task_new (command, cancellable, callback, user_data);
+ g_task_set_source_tag (task, ma_command_run_async);
+
+ if (cancellable)
+ {
+ g_signal_connect_object (cancellable, "cancelled",
+ G_CALLBACK (cancelled_cb), task,
+ G_CONNECT_AFTER);
+ }
+
+ data = g_new0 (CommandData, 1);
+ g_task_set_task_data (task, data, command_data_free);
+
+ spawn_flags = G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD;
+ error = NULL;
+
+ if (!g_spawn_async_with_pipes (NULL, command->argv, NULL, spawn_flags,
+ NULL, NULL, &data->pid, NULL, &command_stdout,
+ NULL, &error))
+ {
+ g_task_return_error (task, error);
+ g_object_unref (task);
+
+ return;
+ }
+
+ channel = data->channel = g_io_channel_unix_new (command_stdout);
+ g_io_channel_set_close_on_unref (channel, TRUE);
+
+ g_assert (error == NULL);
+ status = g_io_channel_set_encoding (channel, NULL, &error);
+
+ if (status != G_IO_STATUS_NORMAL)
+ {
+ g_task_return_error (task, error);
+ g_object_unref (task);
+
+ return;
+ }
+
+ g_assert (error == NULL);
+ status = g_io_channel_set_flags (channel, G_IO_FLAG_NONBLOCK, &error);
+
+ if (status != G_IO_STATUS_NORMAL)
+ {
+ g_task_return_error (task, error);
+ g_object_unref (task);
+
+ return;
+ }
+
+ data->input = g_string_new (NULL);
+
+ condition = G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP;
+ data->io_watch_id = g_io_add_watch (channel, condition, read_cb, task);
+
+ data->child_watch_id = g_child_watch_add (data->pid, child_watch_cb, task);
+}
+
+/**
+ * ma_command_run_finish:
+ * @command: a #MaCommand
+ * @result: a #GAsyncResult
+ * @error: (nullable): return location for an error, or %NULL
+ *
+ * Finishes an operation started with ma_command_run_async().
+ *
+ * Returns: %NULL if @error is set, otherwise output from command
+ */
+gchar *
+ma_command_run_finish (MaCommand *command,
+ GAsyncResult *result,
+ GError **error)
+{
+ g_return_val_if_fail (MA_IS_COMMAND (command), NULL);
+ g_return_val_if_fail (g_task_is_valid (result, command), NULL);
+ g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+ return g_task_propagate_pointer (G_TASK (result), error);
+}
diff --git a/command/ma-command.h b/command/ma-command.h
new file mode 100644
index 00000000..8fb51ab3
--- /dev/null
+++ b/command/ma-command.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2018 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MA_COMMAND_H
+#define MA_COMMAND_H
+
+#include <gio/gio.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define MA_TYPE_COMMAND (ma_command_get_type ())
+G_DECLARE_FINAL_TYPE (MaCommand, ma_command, MA, COMMAND, GObject)
+
+MaCommand *ma_command_new (const gchar *command,
+ GError **error);
+
+void ma_command_run_async (MaCommand *command,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+
+gchar *ma_command_run_finish (MaCommand *command,
+ GAsyncResult *result,
+ GError **error);
+
+G_END_DECLS
+
+#endif