vis: add motions to move by codepoints

Some people might prefer this for <Backspace> behavior. Except for that
and debugging purposes using `ga` and `g8` it is not yet that useful.

6 files changed, 41 insertions, 2 deletions

diff --git a/config.def.h b/config.def.h
index 1fba42a..ffc9577 100644
--- a/config.def.h
+++ b/config.def.h
@@ -62,8 +62,10 @@ static const KeyBinding bindings_motions[] = {
 	{ "F",                  ACTION(TO_LEFT)                             },
 	{ "f",                  ACTION(TO_RIGHT)                            },
 	{ "go",                 ACTION(CURSOR_BYTE)                         },
-	{ "gh",                 ACTION(CURSOR_BYTE_LEFT)                    },
-	{ "gl",                 ACTION(CURSOR_BYTE_RIGHT)                   },
+	{ "gH",                 ACTION(CURSOR_BYTE_LEFT)                    },
+	{ "gL",                 ACTION(CURSOR_BYTE_RIGHT)                   },
+	{ "gh",                 ACTION(CURSOR_CODEPOINT_PREV)               },
+	{ "gl",                 ACTION(CURSOR_CODEPOINT_NEXT)               },
 	{ "g0",                 ACTION(CURSOR_SCREEN_LINE_BEGIN)            },
 	{ "g_",                 ACTION(CURSOR_LINE_FINISH)                  },
 	{ "G",                  ACTION(CURSOR_LINE_LAST)                    },
diff --git a/main.c b/main.c
index b5a9d9e..031c796 100644
--- a/main.c
+++ b/main.c
@@ -134,6 +134,8 @@ enum {
 	VIS_ACTION_CURSOR_CHAR_NEXT,
 	VIS_ACTION_CURSOR_LINE_CHAR_PREV,
 	VIS_ACTION_CURSOR_LINE_CHAR_NEXT,
+	VIS_ACTION_CURSOR_CODEPOINT_PREV,
+	VIS_ACTION_CURSOR_CODEPOINT_NEXT,
 	VIS_ACTION_CURSOR_WORD_START_PREV,
 	VIS_ACTION_CURSOR_WORD_START_NEXT,
 	VIS_ACTION_CURSOR_WORD_END_PREV,
@@ -332,6 +334,16 @@ static const KeyAction vis_action[] = {
 		VIS_HELP("Move cursor right, to the next character on the same line")
 		movement, { .i = VIS_MOVE_LINE_CHAR_NEXT }
 	},
+	[VIS_ACTION_CURSOR_CODEPOINT_PREV] = {
+		"vis-motion-codepoint-prev",
+		VIS_HELP("Move to the previous Unicode codepoint")
+		movement, { .i = VIS_MOVE_CODEPOINT_PREV }
+	},
+	[VIS_ACTION_CURSOR_CODEPOINT_NEXT] = {
+		"vis-motion-codepoint-next",
+		VIS_HELP("Move to the next Unicode codepoint")
+		movement, { .i = VIS_MOVE_CODEPOINT_NEXT }
+	},
 	[VIS_ACTION_CURSOR_WORD_START_PREV] = {
 		"vis-motion-word-start-prev",
 		VIS_HELP("Move cursor words backwards")
diff --git a/text-motions.c b/text-motions.c
index ee8220e..210e1f4 100644
--- a/text-motions.c
+++ b/text-motions.c
@@ -39,6 +39,18 @@ size_t text_char_prev(Text *txt, size_t pos) {
 	return it.pos;
 }
 
+size_t text_codepoint_next(Text *txt, size_t pos) {
+	Iterator it = text_iterator_get(txt, pos);
+	text_iterator_codepoint_next(&it, NULL);
+	return it.pos;
+}
+
+size_t text_codepoint_prev(Text *txt, size_t pos) {
+	Iterator it = text_iterator_get(txt, pos);
+	text_iterator_codepoint_prev(&it, NULL);
+	return it.pos;
+}
+
 static size_t find_next(Text *txt, size_t pos, const char *s, bool line) {
 	if (!s)
 		return pos;
diff --git a/text-motions.h b/text-motions.h
index cca84c1..5df4e32 100644
--- a/text-motions.h
+++ b/text-motions.h
@@ -16,6 +16,9 @@ size_t text_end(Text*, size_t pos);
 size_t text_char_next(Text*, size_t pos);
 size_t text_char_prev(Text*, size_t pos);
 
+size_t text_codepoint_next(Text*, size_t pos);
+size_t text_codepoint_prev(Text*, size_t pos);
+
 /* find the given substring either in forward or backward direction.
  * does not wrap around at file start / end. if no match is found return
  * original position */
diff --git a/vis-motions.c b/vis-motions.c
index 1ceb958..0166117 100644
--- a/vis-motions.c
+++ b/vis-motions.c
@@ -491,6 +491,14 @@ const Movement vis_motions[] = {
 		.txt = text_line_char_next,
 		.type = CHARWISE,
 	},
+	[VIS_MOVE_CODEPOINT_PREV] = {
+		.txt = text_codepoint_prev,
+		.type = CHARWISE,
+	},
+	[VIS_MOVE_CODEPOINT_NEXT] = {
+		.txt = text_codepoint_next,
+		.type = CHARWISE,
+	},
 	[VIS_MOVE_WORD_NEXT] = {
 		.vis = word_next,
 		.type = CHARWISE|IDEMPOTENT,
diff --git a/vis.h b/vis.h
index 8f74a36..9b9fbb9 100644
--- a/vis.h
+++ b/vis.h
@@ -269,6 +269,8 @@ enum VisMotion {
 	VIS_MOVE_CHAR_NEXT,
 	VIS_MOVE_LINE_CHAR_PREV,
 	VIS_MOVE_LINE_CHAR_NEXT,
+	VIS_MOVE_CODEPOINT_PREV,
+	VIS_MOVE_CODEPOINT_NEXT,
 	VIS_MOVE_WORD_NEXT,
 	VIS_MOVE_WORD_START_NEXT,
 	VIS_MOVE_WORD_END_PREV,