imactivateexpr

example_ibus.vim

if !exists('&imstatusfunc') || !has('gui_running')
  finish
endif

" Initialize after fork and GUI focus gained to get current input context.
autocmd FocusGained * call s:Init()

let s:init = 0

function! s:Init()
  if s:init
    return
  endif

  python <<EOF
import ibus

im_bus = ibus.Bus()
im_ic = ibus.InputContext(im_bus, im_bus.current_input_contxt())

def im_is_active():
  if im_ic.is_enabled():
    return 1
  else:
    return 0

def im_enable():
  im_ic.enable()

def im_disable():
  im_ic.disable()
EOF

  set imstatusfunc=ImStatusFunc imactivatefunc=ImActivateFunc

  let s:init = 1
endfunction

function! ImStatusFunc()
  return pyeval('im_is_active()')
endfunction

function! ImActivateFunc(active)
  if a:active
    python im_enable()
  else
    python im_disable()
  endif
endfunction

ibusctrl.c

// gcc ibusctrl.c -o ibusctrl.so -shared -fPIC `pkg-config --cflags --libs ibus-1.0 glib-2.0`

#include <dlfcn.h>
#include <glib.h>
#include <ibus.h>

static IBusBus *bus = NULL;
static IBusInputContext *ic = NULL;

int im_init(const char *selfpath)
{
    gchar *path;
    GDBusConnection *conn;

    dlopen(selfpath, RTLD_LAZY);

    ibus_init();

    bus = ibus_bus_new();
    if (bus == NULL)
        return -1;

    path = ibus_bus_current_input_context(bus);
    if (path == NULL)
        return -1;

    conn = ibus_bus_get_connection(bus);

    ic = ibus_input_context_get_input_context(path, conn);
    if (ic == NULL)
        return -1;

    g_free(path);

    return 0;
}

int im_is_enabled()
{
    return ibus_input_context_is_enabled(ic) ? 1 : 0;
}

int im_enable()
{
    ibus_input_context_enable(ic);
    return 0;
}

int im_disable()
{
    ibus_input_context_disable(ic);
    return 0;
}

ibusctrl.vim

if !exists('&imstatusfunc') || !has('gui_running')
  finish
endif

" Initialize after fork and GUI focus gained to get current input context.
autocmd FocusGained * call s:Init()

let s:libpath = expand('<sfile>:p:h') . '/ibusctrl.so'
let s:init = 0

function! s:Init()
  if s:init
    return
  endif
  call libcallnr(s:libpath, 'im_init', s:libpath)
  set imstatusfunc=ImStatusFunc imactivatefunc=ImActivateFunc
  let s:init = 1
endfunction

function! ImStatusFunc()
  return libcallnr(s:libpath, 'im_is_enabled', 0)
endfunction

function! ImActivateFunc(active)
  if a:active
    call libcallnr(s:libpath, 'im_enable', 0)
  else
    call libcallnr(s:libpath, 'im_disable', 0)
  endif
endfunction

imactivate_user_func.diff

diff -r 536aa8b0c934 runtime/doc/options.txt
--- a/runtime/doc/options.txt	Wed Aug 15 17:43:31 2012 +0200
+++ b/runtime/doc/options.txt	Thu Aug 16 03:00:53 2012 +0900
@@ -3971,6 +3971,25 @@
 	Can be overruled by using "\c" or "\C" in the pattern, see
 	|/ignorecase|.
 
+						*'imactivatefunc'* *'imaf'*
+'imactivatefunc' 'imaf'	string (default "")
+			global
+			{not in Vi}
+			{only available when compiled with |+xim| and
+			|+GUI_GTK|}
+	This option specifies a function to be used to activate/inactivate
+	Input Method.
+
+	Prototype is: >
+		:function ImActivateFunc(active)
+		:  if a:active
+		:    ... do something
+		:  else
+		:    ... do something
+		:  endif
+		:  " return value is not used
+		:endfunction
+<
 						*'imactivatekey'* *'imak'*
 'imactivatekey' 'imak'	string (default "")
 			global
@@ -4067,6 +4086,23 @@
 	The value 0 may not work correctly with Athena and Motif with some XIM
 	methods.  Use 'imdisable' to disable XIM then.
 
+						*'imstatusfunc'* *'imsf'*
+'imstatusfunc' 'imsf'	string (default "")
+			global
+			{not in Vi}
+			{only available when compiled with |+xim| and
+			|+GUI_GTK|}
+	This option specifies a function to be used to get status of Input
+	Method.
+
+	Prototype is: >
+		:function ImStatusFunc()
+		:  let is_active = ...do something
+		:  return is_active ? 1 : 0
+		:endfunction
+<
+	NOTE: This function is invoked too often.  Keep it fast.
+
 						*'include'* *'inc'*
 'include' 'inc'		string	(default "^\s*#\s*include")
 			global or local to buffer |global-local|
diff -r 536aa8b0c934 src/eval.c
--- a/src/eval.c	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/eval.c	Thu Aug 16 03:00:53 2012 +0900
@@ -1660,7 +1660,7 @@
 }
 # endif
 
-# if defined(FEAT_COMPL_FUNC) || defined(PROTO)
+# if defined(FEAT_GTK) || defined(FEAT_COMPL_FUNC) || defined(PROTO)
 /*
  * Call vimL function "func" and return the result as a number.
  * Returns -1 when calling the function fails.
diff -r 536aa8b0c934 src/fileio.c
--- a/src/fileio.c	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/fileio.c	Thu Aug 16 03:00:53 2012 +0900
@@ -9529,6 +9529,12 @@
 # endif
 }
 
+    int
+is_autocmd_blocked()
+{
+    return autocmd_blocked != 0;
+}
+
 /*
  * Find next autocommand pattern that matches.
  */
diff -r 536aa8b0c934 src/mbyte.c
--- a/src/mbyte.c	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/mbyte.c	Thu Aug 16 03:00:53 2012 +0900
@@ -4390,7 +4390,7 @@
 {
     int was_active;
 
-    was_active = !!im_is_active;
+    was_active = !!im_get_status();
     im_is_active = (active && !p_imdisable);
 
     if (im_is_active != was_active)
@@ -5014,46 +5014,26 @@
 {
     if (xic != NULL)
     {
-	/*
-	 * The third-party imhangul module (and maybe others too) ignores
-	 * gtk_im_context_reset() or at least doesn't reset the active state.
-	 * Thus sending imactivatekey would turn it off if it was on before,
-	 * which is clearly not what we want.  Fortunately we can work around
-	 * that for imhangul by sending GDK_Escape, but I don't know if it
-	 * works with all IM modules that support an activation key :/
-	 *
-	 * An alternative approach would be to destroy the IM context and
-	 * recreate it.  But that means loading/unloading the IM module on
-	 * every mode switch, which causes a quite noticeable delay even on
-	 * my rather fast box...
-	 * *
-	 * Moreover, there are some XIM which cannot respond to
-	 * im_synthesize_keypress(). we hope that they reset by
-	 * xim_shutdown().
-	 */
-	if (im_activatekey_keyval != GDK_VoidSymbol && im_is_active)
-	    im_synthesize_keypress(GDK_Escape, 0U);
-
 	gtk_im_context_reset(xic);
 
-	/*
-	 * HACK for Ami: This sequence of function calls makes Ami handle
-	 * the IM reset graciously, without breaking loads of other stuff.
-	 * It seems to force English mode as well, which is exactly what we
-	 * want because it makes the Ami status display work reliably.
-	 */
-	gtk_im_context_set_use_preedit(xic, FALSE);
-
 	if (p_imdisable)
 	    im_shutdown();
 	else
 	{
-	    gtk_im_context_set_use_preedit(xic, TRUE);
 	    xim_set_focus(gui.in_focus);
 
-	    if (im_activatekey_keyval != GDK_VoidSymbol)
+	    if (p_imaf[0] != NUL)
 	    {
+		char_u *argv[1];
 		if (im_is_active)
+		    argv[0] = "1";
+		else
+		    argv[0] = "0";
+		(void)call_func_retnr(p_imaf, 1, argv, FALSE);
+	    }
+	    else if (im_activatekey_keyval != GDK_VoidSymbol)
+	    {
+ 		if (im_is_active)
 		{
 		    g_signal_handler_block(xic, im_commit_handler_id);
 		    im_synthesize_keypress(im_activatekey_keyval,
@@ -5211,6 +5191,21 @@
     int
 im_get_status(void)
 {
+    if (p_imsf[0] != NUL)
+    {
+	int is_active;
+	/* FIXME: Don't execute user function in unsafe situation. */
+	if (exiting || is_autocmd_blocked())
+	    return FALSE;
+	/* FIXME: :py print 'xxx' is shown duplicate result.
+	 * Use silent to avoid it. */
+	++msg_silent;
+	is_active = call_func_retnr(p_imsf, 0, NULL, FALSE);
+	--msg_silent;
+	if (is_active == -1 || is_active == 0)
+	    return FALSE;
+	return TRUE;
+    }
     return im_is_active;
 }
 
diff -r 536aa8b0c934 src/option.c
--- a/src/option.c	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/option.c	Thu Aug 16 03:00:53 2012 +0900
@@ -1416,6 +1416,15 @@
     {"ignorecase",  "ic",   P_BOOL|P_VI_DEF,
 			    (char_u *)&p_ic, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCRIPTID_INIT},
+    {"imactivatefunc","imaf",P_STRING|P_VI_DEF|P_SECURE,
+# if defined(FEAT_EVAL) && defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
+			    (char_u *)&p_imaf, PV_NONE,
+			    {(char_u *)"", (char_u *)NULL}
+# else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
+# endif
+			    SCRIPTID_INIT},
     {"imactivatekey","imak",P_STRING|P_VI_DEF,
 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
 			    (char_u *)&p_imak, PV_NONE,
@@ -1458,6 +1467,15 @@
 			    {(char_u *)B_IMODE_NONE, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
+    {"imstatusfunc","imse",P_STRING|P_VI_DEF|P_SECURE,
+# if defined(FEAT_EVAL) && defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
+			    (char_u *)&p_imsf, PV_NONE,
+			    {(char_u *)"", (char_u *)NULL}
+# else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
+# endif
+			    SCRIPTID_INIT},
     {"include",	    "inc",  P_STRING|P_ALLOCED|P_VI_DEF,
 #ifdef FEAT_FIND_ID
 			    (char_u *)&p_inc, PV_INC,
diff -r 536aa8b0c934 src/option.h
--- a/src/option.h	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/option.h	Thu Aug 16 03:00:53 2012 +0900
@@ -557,6 +557,8 @@
 EXTERN int	p_ic;		/* 'ignorecase' */
 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
 EXTERN char_u	*p_imak;	/* 'imactivatekey' */
+EXTERN char_u	*p_imaf;	/* 'imactivatefunc' */
+EXTERN char_u	*p_imsf;	/* 'imstatusfunc' */
 #endif
 #ifdef USE_IM_CONTROL
 EXTERN int	p_imcmdline;	/* 'imcmdline' */
diff -r 536aa8b0c934 src/proto/fileio.pro
--- a/src/proto/fileio.pro	Wed Aug 15 17:43:31 2012 +0200
+++ b/src/proto/fileio.pro	Thu Aug 16 03:00:53 2012 +0900
@@ -47,6 +47,7 @@
 int has_insertcharpre __ARGS((void));
 void block_autocmds __ARGS((void));
 void unblock_autocmds __ARGS((void));
+int is_autocmd_blocked __ARGS((void));
 int has_autocmd __ARGS((event_T event, char_u *sfname, buf_T *buf));
 char_u *get_augroup_name __ARGS((expand_T *xp, int idx));
 char_u *set_context_in_autocmd __ARGS((expand_T *xp, char_u *arg, int doautocmd));

僕の方じゃないすかね。中平さんのは試してないだけで上手くいくのは見えてるので。