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authorWu Xiaotian <[email protected]>2019-07-03 15:14:35 +0800
committerraveit65 <[email protected]>2019-07-08 14:31:05 +0200
commitdc14537a19b3fb3448f46d78707517d197e8febb (patch)
treecb020d7de0cf87f014340757a3aea07f252e5bdb /command/ma-command.c
parent1c197aa881092efcdb2d9013e73d0004d58ccdf3 (diff)
downloadmate-applets-dc14537a19b3fb3448f46d78707517d197e8febb.tar.bz2
mate-applets-dc14537a19b3fb3448f46d78707517d197e8febb.tar.xz
command: use MaCommand object
Diffstat (limited to 'command/ma-command.c')
-rw-r--r--command/ma-command.c417
1 files changed, 417 insertions, 0 deletions
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);
+}
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