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/*
* tkUnixSysNotify.c --
*
* tkUnixSysNotify.c implements a "sysnotify" Tcl command which
* permits one to post system notifications based on the libnotify API.
*
* Copyright © 2020 Kevin Walzer/WordTech Communications LLC.
* Copyright © 2020 Christian Werner for runtime linking
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkInt.h"
#include "tkUnixInt.h"
/*
* Runtime linking of libnotify.
*/
typedef int (*fn_ln_init)(const char *);
typedef void (*fn_ln_uninit)(void);
typedef void * (*fn_ln_notification_new)(const char *, const char *,
const char *, void *);
typedef int (*fn_ln_notification_show)(void *, int *);
static struct {
int nopen;
Tcl_LoadHandle lib;
fn_ln_init init;
fn_ln_uninit uninit;
fn_ln_notification_new notification_new;
fn_ln_notification_show notification_show;
} ln_fns = {
0, NULL, NULL, NULL, NULL, NULL
};
#define notify_init ln_fns.init
#define notify_uninit ln_fns.uninit
#define notify_notification_new ln_fns.notification_new
#define notify_notification_show ln_fns.notification_show
TCL_DECLARE_MUTEX(ln_mutex);
/*
* Forward declarations for procedures defined in this file.
*/
static void SysNotifyDeleteCmd(void *);
static int SysNotifyCmd(void *, Tcl_Interp *, int, Tcl_Obj * const*);
/*
*----------------------------------------------------------------------
*
* SysNotifyDeleteCmd --
*
* Delete notification and clean up.
*
* Results:
* Window destroyed.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
SysNotifyDeleteCmd (
TCL_UNUSED(void *))
{
Tcl_MutexLock(&ln_mutex);
if (--ln_fns.nopen == 0) {
if (notify_uninit) {
notify_uninit();
}
if (ln_fns.lib != NULL) {
Tcl_FSUnloadFile(NULL, ln_fns.lib);
}
memset(&ln_fns, 0, sizeof(ln_fns));
}
Tcl_MutexUnlock(&ln_mutex);
}
/*
*----------------------------------------------------------------------
*
* SysNotifyCreateCmd --
*
* Create tray command and (unreal) window.
*
* Results:
* Icon tray and hidden window created.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
SysNotifyCmd(
TCL_UNUSED(void *),
Tcl_Interp *interp,
int objc,
Tcl_Obj *const *objv)
{
const char *title;
const char *message;
const char *icon;
const char *appname = "Wish";
void *notif;
if (objc < 3) {
Tcl_WrongNumArgs(interp, 1, objv, "title message");
return TCL_ERROR;
}
/*
* Pass strings to notification, and use a sane platform-specific
* icon in the alert.
*/
title = Tcl_GetString(objv[1]);
message = Tcl_GetString(objv[2]);
icon = "dialog-information";
/* Use the appname for libnotify initialization
* See bug f63c37be3a for a discussion whether this should be
* allowed at all on safe interpreters
*/
if (!Tcl_IsSafe(interp)) {
appname = ((TkWindow *)Tk_MainWindow(interp))->nameUid;
}
/*
* Call to notify_init should go here to prevent test suite failure.
*/
if (notify_init && notify_notification_new && notify_notification_show) {
Tcl_Encoding enc;
Tcl_DString dst, dsm;
Tcl_DStringInit(&dst);
Tcl_DStringInit(&dsm);
enc = Tcl_GetEncoding(NULL, "utf-8");
char *dstStr = Tcl_UtfToExternalDString(enc, title, TCL_INDEX_NONE, &dst);
char *dsmStr = Tcl_UtfToExternalDString(enc, message, TCL_INDEX_NONE, &dsm);
notify_init(appname);
notif = notify_notification_new(dstStr, dsmStr, icon, NULL);
notify_notification_show(notif, NULL);
Tcl_DStringFree(&dsm);
Tcl_DStringFree(&dst);
Tcl_FreeEncoding(enc);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* SysNotify_Init --
*
* Initialize the command.
*
* Results:
* Command initialized.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
SysNotify_Init(
Tcl_Interp *interp)
{
Tcl_MutexLock(&ln_mutex);
if (ln_fns.nopen == 0) {
int i = 0;
Tcl_Obj *nameobj;
static const char *lnlibs[] = {
"libnotify.so.4",
"libnotify.so.3",
"libnotify.so.2",
"libnotify.so.1",
"libnotify.so",
NULL
};
while (lnlibs[i] != NULL) {
Tcl_ResetResult(interp);
nameobj = Tcl_NewStringObj(lnlibs[i], TCL_INDEX_NONE);
Tcl_IncrRefCount(nameobj);
if (Tcl_LoadFile(interp, nameobj, NULL, 0, NULL, &ln_fns.lib)
== TCL_OK) {
Tcl_DecrRefCount(nameobj);
break;
}
Tcl_DecrRefCount(nameobj);
++i;
}
if (ln_fns.lib != NULL) {
#define LN_SYM(name) \
ln_fns.name = (fn_ln_ ## name) \
Tcl_FindSymbol(NULL, ln_fns.lib, "notify_" #name)
LN_SYM(init);
LN_SYM(uninit);
LN_SYM(notification_new);
LN_SYM(notification_show);
#undef LN_SYM
}
}
ln_fns.nopen++;
Tcl_MutexUnlock(&ln_mutex);
if (!notify_init) return TCL_OK;
Tcl_CreateObjCommand(interp, "::tk::sysnotify::_sysnotify", SysNotifyCmd,
interp, SysNotifyDeleteCmd);
return TCL_OK;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* coding: utf-8
* End:
*/
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