Struct gio::ApplicationCommandLine
source · #[repr(transparent)]pub struct ApplicationCommandLine { /* private fields */ }
Expand description
ApplicationCommandLine
represents a command-line invocation of
an application. It is created by Application
and emitted
in the signal::Application::command-line
signal and virtual function.
The class contains the list of arguments that the program was invoked with. It is also possible to query if the commandline invocation was local (ie: the current process is running in direct response to the invocation) or remote (ie: some other process forwarded the commandline to this process).
The GApplicationCommandLine object can provide the argc
and argv
parameters for use with the GOptionContext
command-line parsing API,
with the ApplicationCommandLineExt::arguments()
function. See
[gapplication-example-cmdline3.c][gapplication-example-cmdline3]
for an example.
The exit status of the originally-invoked process may be set and messages can be printed to stdout or stderr of that process. The lifecycle of the originally-invoked process is tied to the lifecycle of this object (ie: the process exits when the last reference is dropped).
The main use for ApplicationCommandLine
(and the
signal::Application::command-line
signal) is ‘Emacs server’ like use cases:
You can set the EDITOR
environment variable to have e.g. git use
your favourite editor to edit commit messages, and if you already
have an instance of the editor running, the editing will happen
in the running instance, instead of opening a new one. An important
aspect of this use case is that the process that gets started by git
does not return until the editing is done.
Normally, the commandline is completely handled in the
signal::Application::command-line
handler. The launching instance exits
once the signal handler in the primary instance has returned, and
the return value of the signal handler becomes the exit status
of the launching instance.
⚠️ The following code is in C ⚠️
static int
command_line (GApplication *application,
GApplicationCommandLine *cmdline)
{
gchar **argv;
gint argc;
gint i;
argv = g_application_command_line_get_arguments (cmdline, &argc);
g_application_command_line_print (cmdline,
"This text is written back\n"
"to stdout of the caller\n");
for (i = 0; i < argc; i++)
g_print ("argument %d: %s\n", i, argv[i]);
g_strfreev (argv);
return 0;
}
The complete example can be found here: gapplication-example-cmdline.c
In more complicated cases, the handling of the comandline can be split between the launcher and the primary instance.
⚠️ The following code is in C ⚠️
static gboolean
test_local_cmdline (GApplication *application,
gchar ***arguments,
gint *exit_status)
{
gint i, j;
gchar **argv;
argv = *arguments;
i = 1;
while (argv[i])
{
if (g_str_has_prefix (argv[i], "--local-"))
{
g_print ("handling argument %s locally\n", argv[i]);
g_free (argv[i]);
for (j = i; argv[j]; j++)
argv[j] = argv[j + 1];
}
else
{
g_print ("not handling argument %s locally\n", argv[i]);
i++;
}
}
*exit_status = 0;
return FALSE;
}
static void
test_application_class_init (TestApplicationClass *class)
{
G_APPLICATION_CLASS (class)->local_command_line = test_local_cmdline;
...
}
In this example of split commandline handling, options that start
with --local-
are handled locally, all other options are passed
to the signal::Application::command-line
handler which runs in the primary
instance.
The complete example can be found here: gapplication-example-cmdline2.c
If handling the commandline requires a lot of work, it may be better to defer it.
⚠️ The following code is in C ⚠️
static gboolean
my_cmdline_handler (gpointer data)
{
GApplicationCommandLine *cmdline = data;
// do the heavy lifting in an idle
g_application_command_line_set_exit_status (cmdline, 0);
g_object_unref (cmdline); // this releases the application
return G_SOURCE_REMOVE;
}
static int
command_line (GApplication *application,
GApplicationCommandLine *cmdline)
{
// keep the application running until we are done with this commandline
g_application_hold (application);
g_object_set_data_full (G_OBJECT (cmdline),
"application", application,
(GDestroyNotify)g_application_release);
g_object_ref (cmdline);
g_idle_add (my_cmdline_handler, cmdline);
return 0;
}
In this example the commandline is not completely handled before
the signal::Application::command-line
handler returns. Instead, we keep
a reference to the ApplicationCommandLine
object and handle it
later (in this example, in an idle). Note that it is necessary to
hold the application until you are done with the commandline.
The complete example can be found here: gapplication-example-cmdline3.c
Implements
Implementations§
source§impl ApplicationCommandLine
impl ApplicationCommandLine
pub const NONE: Option<&'static ApplicationCommandLine> = None
Trait Implementations§
source§impl Clone for ApplicationCommandLine
impl Clone for ApplicationCommandLine
source§impl Debug for ApplicationCommandLine
impl Debug for ApplicationCommandLine
source§impl Display for ApplicationCommandLine
impl Display for ApplicationCommandLine
source§impl Hash for ApplicationCommandLine
impl Hash for ApplicationCommandLine
source§impl Ord for ApplicationCommandLine
impl Ord for ApplicationCommandLine
source§impl<OT: ObjectType> PartialEq<OT> for ApplicationCommandLine
impl<OT: ObjectType> PartialEq<OT> for ApplicationCommandLine
source§impl<OT: ObjectType> PartialOrd<OT> for ApplicationCommandLine
impl<OT: ObjectType> PartialOrd<OT> for ApplicationCommandLine
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for ApplicationCommandLine
impl StaticType for ApplicationCommandLine
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for ApplicationCommandLine
Auto Trait Implementations§
impl RefUnwindSafe for ApplicationCommandLine
impl !Send for ApplicationCommandLine
impl !Sync for ApplicationCommandLine
impl Unpin for ApplicationCommandLine
impl UnwindSafe for ApplicationCommandLine
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&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> SignalHandlerId
signal_name
on this object. Read moresource§fn try_connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> Result<SignalHandlerId, BoolError>
fn try_connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> Result<SignalHandlerId, BoolError>
Self::connect_closure_id
but fails instead of panicking.source§fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> SignalHandlerId
signal_id
on this object. Read moresource§fn watch_closure(&self, closure: &impl AsRef<Closure>)
fn watch_closure(&self, closure: &impl AsRef<Closure>)
closure
to the lifetime of the object. When
the object’s reference count drops to zero, the closure will be
invalidated. An invalidated closure will ignore any calls to
Closure::invoke
.source§unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,
signal_id
on this object. Read moresource§fn try_emit<R>(
&self,
signal_id: SignalId,
args: &[&dyn ToValue]
) -> Result<R, BoolError>where
R: TryFromClosureReturnValue,
fn try_emit<R>( &self, signal_id: SignalId, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,
Self::emit
but fails instead of panicking.source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn try_emit_with_values(
&self,
signal_id: SignalId,
args: &[Value]
) -> Result<Option<Value>, BoolError>
fn try_emit_with_values( &self, signal_id: SignalId, args: &[Value] ) -> Result<Option<Value>, BoolError>
Self::emit_with_values
but fails instead of panicking.source§fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.source§fn try_emit_by_name<R>(
&self,
signal_name: &str,
args: &[&dyn ToValue]
) -> Result<R, BoolError>where
R: TryFromClosureReturnValue,
fn try_emit_by_name<R>( &self, signal_name: &str, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,
Self::emit_by_name
but fails instead of panicking.source§fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn try_emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Result<Option<Value>, BoolError>
fn try_emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Result<Option<Value>, BoolError>
Self::emit_by_name_with_values
but fails instead of panicking.source§fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>
source§fn try_emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Result<R, BoolError>where
R: TryFromClosureReturnValue,
fn try_emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,
Self::emit_by_name_with_details
but fails instead of panicking.source§fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn try_emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Result<Option<Value>, BoolError>
fn try_emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Result<Option<Value>, BoolError>
Self::emit_by_name_with_details_and_values
but fails instead of panicking.source§fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>
source§fn try_emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Result<R, BoolError>where
R: TryFromClosureReturnValue,
fn try_emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,
Self::emit_with_details
but fails instead of panicking.source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn try_emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Result<Option<Value>, BoolError>
fn try_emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Result<Option<Value>, BoolError>
Self::emit_with_details_and_values
but fails instead of panicking.source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more