From 0b499d465bca356b52a4cb8cdf9b780f1dbb4e6a Mon Sep 17 00:00:00 2001
From: Chris Allegretta <chrisa@asty.org>
Date: Mon, 14 Jul 2008 07:18:22 +0000
Subject: [PATCH] Add xflags to undo struct so we can add extra info to the
 undo process (e.g. backspace vs delete) Fix redo of a line join.

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4282 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
---
 src/nano.h |  6 ++++++
 src/text.c | 34 ++++++++++++++++++++++++++--------
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/src/nano.h b/src/nano.h
index 734172c4..f40d69d4 100644
--- a/src/nano.h
+++ b/src/nano.h
@@ -261,6 +261,7 @@ typedef struct undo {
 	/* Generic pointer for data regardless of what type it is */
     struct undo *next;
     ssize_t lineno;
+    int xflags;
 } undo;
 #endif /* NANO_TINY */
 
@@ -672,6 +673,11 @@ typedef struct subnfunc {
 #define TOGGLE_BACKWARDS_KEY		NANO_META_B
 #define TOGGLE_DOS_KEY			NANO_META_D
 #define TOGGLE_MAC_KEY			NANO_META_M
+
+/* Extra bits for the undo function */
+#define UNDO_DEL_DEL		(1<<0)
+#define UNDO_DEL_BACKSPACE	(1<<1)
+
 #endif /* !NANO_TINY */
 
 #define VIEW TRUE
diff --git a/src/text.c b/src/text.c
index 242d9cd4..5666015b 100644
--- a/src/text.c
+++ b/src/text.c
@@ -414,7 +414,8 @@ void do_undo(void)
 	strcpy(&data[u->begin + strlen(u->strdata)], &f->data[u->begin]);
 	free(f->data);
 	f->data = data;
-	openfile->current_x += strlen(u->strdata);
+	if (u->xflags == UNDO_DEL_BACKSPACE)
+	    openfile->current_x += strlen(u->strdata);
 	break;
     case SPLIT:
 	action = _("line split");
@@ -425,7 +426,7 @@ void do_undo(void)
 	    unlink_node(tmp);
 	    delete_node(tmp);
 	}
-	renumber(openfile->current->prev);
+	renumber(f);
 	break;
     case UNSPLIT:
 	action = _("line join");
@@ -436,7 +437,7 @@ void do_undo(void)
 	free(f->data);
 	f->data = data;
 	splice_node(f, t, f->next);
-	renumber(openfile->current->prev);
+	renumber(f);
 	break;
     default:
 	action = _("wtf?");
@@ -511,18 +512,22 @@ void do_redo(void)
 	free(f->data);
 	f->data = data;
 	splice_node(f, t, f->next);
-	renumber(openfile->current->prev);
+	renumber(f);
 	break;
     case UNSPLIT:
 	action = _("line join");
+	len = strlen(f->data) + strlen(u->strdata + 1);
+	data = charalloc(len);
+	strcpy(data, f->data);
+	strcat(data, u->strdata);
 	free(f->data);
-	f->data = mallocstrcpy(NULL, u->strdata);
+	f->data = data;
 	if (f->next != NULL) {
 	    filestruct *tmp = f->next;
 	    unlink_node(tmp);
 	    delete_node(tmp);
 	}
-	renumber(openfile->current->prev);
+	renumber(f);
 	break;
     default:
 	action = _("wtf?");
@@ -709,6 +714,7 @@ void add_undo(undo_type current_action, openfilestruct *fs)
     u->lineno = fs->current->lineno;
     u->begin = fs->current_x;
     u->fs = fs->current;
+    u->xflags = 0;
     u->next = fs->undotop;
     fs->undotop = u;
     fs->current_undo = u;
@@ -768,7 +774,7 @@ void update_undo(undo_type action, openfilestruct *fs)
     assert(fs->undotop != NULL);
     u = fs->undotop;
 
-    if (u->fs->data != openfile->current->data) {
+    if (u->fs->data != openfile->current->data || u->lineno !=  openfile->current->lineno) {
         add_undo(action, fs);
 	return;
     }
@@ -795,6 +801,12 @@ void update_undo(undo_type action, openfilestruct *fs)
 	assert(len > 2);
         if (fs->current_x == u->begin) {
 	    /* They're deleting */
+	    if (!u->xflags)
+		u->xflags = UNDO_DEL_DEL;
+	    else if (u->xflags != UNDO_DEL_DEL) {
+		add_undo(action, fs);
+		return;
+	    }
 	    data = charalloc(len);
 	    strcpy(data, u->strdata);
 	    data[len-2] = fs->current->data[fs->current_x];;
@@ -803,6 +815,12 @@ void update_undo(undo_type action, openfilestruct *fs)
 	    u->strdata = data;
 	} else if (fs->current_x == u->begin - 1) {
 	    /* They're backspacing */
+	    if (!u->xflags)
+		u->xflags = UNDO_DEL_BACKSPACE;
+	    else if (u->xflags != UNDO_DEL_BACKSPACE) {
+		add_undo(action, fs);
+		return;
+	    }
 	    data = charalloc(len);
 	    data[0] = fs->current->data[fs->current_x];
 	    strcpy(&data[1], u->strdata);
@@ -815,7 +833,7 @@ void update_undo(undo_type action, openfilestruct *fs)
 	    return;
 	}
 #ifdef DEBUG
-	fprintf(stderr, "current undo data now \"%s\"\n", u->strdata);
+	fprintf(stderr, "current undo data now \"%s\"\nu->begin = %d\n", u->strdata, u->begin);
 #endif
 	break;
     case SPLIT:
-- 
2.39.5