PATCH: add zle-line-finish special widget

[Greg Klanderman <gak@klanderman.net>]

Hi, I'm re-submitting my previous patch having addressed some of
Bart's concerns.  In particular, I have renamed the special widget to
"zle-line-finish" (was zle-line-finished) and have added code to
save/restore errflag and retflag so that the values from the end of
zlecore() are preserved.

Bart also made the following comments on my original patch which I
have not addressed:

> it's possible that the zle-line-finish widget should not run when
> errflag != 0.

> I don't know all the ramifications of the values of various globals
> at the end of zlecore().  PWS?

Peter, could you comment?

cheers,
Greg


Index: Doc/Zsh/zle.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/zle.yo,v
retrieving revision 1.75
diff -u -r1.75 zle.yo
--- Doc/Zsh/zle.yo	9 Dec 2008 17:37:01 -0000	1.75
+++ Doc/Zsh/zle.yo	16 Jan 2009 23:36:37 -0000
@@ -870,6 +870,11 @@
 (The command inside the function sets the keymap directly; it is
 equivalent to tt(zle vi-cmd-mode).)
 )
+tindex(zle-line-finish)
+item(tt(zle-line-finish))(
+This is similar to tt(zle-line-init) but is executed every time the
+line editor has finished reading a line of input.
+)
 tindex(zle-keymap-select)
 item(tt(zle-keymap-select))(
 Executed every time the keymap changes, i.e. the special parameter
Index: Src/Zle/zle_main.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/zle_main.c,v
retrieving revision 1.121
diff -u -r1.121 zle_main.c
--- Src/Zle/zle_main.c	9 Dec 2008 17:37:01 -0000	1.121
+++ Src/Zle/zle_main.c	16 Jan 2009 23:36:37 -0000
@@ -1212,6 +1212,18 @@
 
     zlecore();
 
+    if ((initthingy = rthingy_nocreate("zle-line-finish"))) {
+	int saverrflag = errflag;
+	int savretflag = retflag;
+	char *args[2];
+	args[0] = initthingy->nam;
+	args[1] = NULL;
+	execzlefunc(initthingy, args, 1);
+	unrefthingy(initthingy);
+	errflag = saverrflag;
+	retflag = savretflag;
+    }
+
     statusline = NULL;
     invalidatelist();
     trashzle();