Hi,
Here's a diff that implement revert-buffer (C-x r). I've split gotoline into
the 'goto-line' specifics and the code that actually jumps to the line so it
can be re-used by revert-buffer to restore the current line.
OK?
--
Cheers,
Jasper
"Stay Hungry. Stay Foolish"
Index: basic.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/basic.c,v
retrieving revision 1.37
diff -p -u -r1.37 basic.c
--- basic.c 18 Jun 2012 09:26:03 -0000 1.37
+++ basic.c 12 Oct 2012 10:25:14 -0000
@@ -485,7 +485,6 @@ swapmark(int f, int n)
int
gotoline(int f, int n)
{
- struct line *clp;
char buf[32], *bufp;
const char *err;
@@ -501,6 +500,16 @@ gotoline(int f, int n)
return (FALSE);
}
}
+ return(setlineno(n));
+}
+
+/*
+ * Set the line number and switch to it.
+ */
+int
+setlineno(int n){
+ struct line *clp;
+
if (n >= 0) {
if (n == 0)
n++;
Index: buffer.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/buffer.c,v
retrieving revision 1.81
diff -p -u -r1.81 buffer.c
--- buffer.c 31 Aug 2012 18:06:42 -0000 1.81
+++ buffer.c 12 Oct 2012 10:25:14 -0000
@@ -861,4 +861,35 @@ checkdirty(struct buffer *bp)
return (TRUE);
}
-
+
+/*
+ * Revert the current buffer to whatever is on disk.
+ */
+/* ARGSUSED */
+int
+revertbuffer(int f, int n){
+ struct mgwin *wp = wheadp;
+ struct buffer *bp = wp->w_bufp;
+ char fbuf[NFILEN + 32];
+ int lineno;
+
+ if (!strlen(bp->b_fname)) {
+ ewprintf("Cannot revert buffer not associated with any files.");
+ return (FALSE);
+ }
+
+ snprintf(fbuf, sizeof(fbuf), "Revert buffer from file %s", bp->b_fname);
+
+ if (eyorn(fbuf)) {
+ /* Save our current line, so we can go back it after reloading
the file. */
+ lineno = wp->w_dotline;
+ if (readin(bp->b_list.l_name)) {
+ return(setlineno(lineno));
+ } else {
+ ewprintf("File %s no longer readable!", bp->b_fname);
+ return (FALSE);
+ }
+ }
+
+ return (FALSE);
+}
Index: def.h
===================================================================
RCS file: /cvs/src/usr.bin/mg/def.h,v
retrieving revision 1.125
diff -p -u -r1.125 def.h
--- def.h 31 Aug 2012 18:06:42 -0000 1.125
+++ def.h 12 Oct 2012 10:25:14 -0000
@@ -414,6 +414,7 @@ int notmodified(int, int);
int popbuftop(struct buffer *, int);
int getbufcwd(char *, size_t);
int checkdirty(struct buffer *);
+int revertbuffer(int, int);
/* display.c */
int vtresize(int, int, int);
@@ -494,6 +495,7 @@ int setmark(int, int);
int clearmark(int, int);
int swapmark(int, int);
int gotoline(int, int);
+int setlineno(int);
/* random.c X */
int showcpos(int, int);
Index: funmap.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/funmap.c,v
retrieving revision 1.40
diff -p -u -r1.40 funmap.c
--- funmap.c 14 Jun 2012 17:21:22 -0000 1.40
+++ funmap.c 12 Oct 2012 10:25:15 -0000
@@ -196,7 +196,8 @@ static struct funmap functnames[] = {
{csprevmatch, "cscope-prev-symbol",},
{csnextfile, "cscope-next-file",},
{csprevfile, "cscope-prev-file",},
- {cscreatelist, "cscope-create-list-of-files-to-index"},
+ {cscreatelist, "cscope-create-list-of-files-to-index",},
+ {revertbuffer, "revert-buffer",},
{NULL, NULL,}
};
Index: keymap.c
===================================================================
RCS file: /cvs/src/usr.bin/mg/keymap.c,v
retrieving revision 1.50
diff -p -u -r1.50 keymap.c
--- keymap.c 7 Jun 2012 15:15:04 -0000 1.50
+++ keymap.c 12 Oct 2012 10:25:15 -0000
@@ -177,7 +177,7 @@ static PF cXcar[] = {
nextwind, /* o */
prevwind, /* p */
rescan, /* q */
- rescan, /* r */
+ revertbuffer, /* r */
savebuffers, /* s */
rescan, /* t */
undo /* u */
Index: mg.1
===================================================================
RCS file: /cvs/src/usr.bin/mg/mg.1,v
retrieving revision 1.68
diff -p -u -r1.68 mg.1
--- mg.1 11 Jul 2012 19:56:13 -0000 1.68
+++ mg.1 12 Oct 2012 10:25:15 -0000
@@ -249,6 +249,8 @@ other-window
other-window
.It C-x p
previous-window
+.It C-x r
+revert-buffer
.It C-x s
save-some-buffers
.It C-x u
@@ -752,6 +754,8 @@ is negative, it is that line from the bo
.It redraw-display
Refresh the display.
Recomputes all window sizes in case something has changed.
+.It revert-buffer
+Revert the current buffer to the latest file on disk.
.It save-buffer
Save the contents of the current buffer if it has been changed,
optionally creating a backup copy.
