From d268609511dc77e1acbd3885642b82751d32bccc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Thu, 10 Mar 2016 20:56:24 +0100
Subject: vis: let <C-u> and <C-d> in visual mode move to prev/next cursor

We do currently not enforce a strict ordering among cursors.
Hence these key bindings can move you to an arbitray position.
In practice it somewhat works because most of the time cursors
are created in "top-down" i.e from the start of the file towards
the end.
---
 config.def.h |  8 ++++----
 main.c       | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/config.def.h b/config.def.h
index e6b2a7d..27fc4eb 100644
--- a/config.def.h
+++ b/config.def.h
@@ -198,8 +198,8 @@ static const KeyBinding bindings_normal[] = {
 	{ "<C-w><Backspace>",   ALIAS("<C-w>k")                             },
 	{ "<C-b>",              ALIAS("<PageUp>")                           },
 	{ "<C-f>",              ALIAS("<PageDown>")                         },
-	{ "<C-u>",              ALIAS("<S-PageUp>")                         },
-	{ "<C-d>",              ALIAS("<S-PageDown>")                       },
+	{ "<C-u>",              ACTION(CURSORS_PREV)                        },
+	{ "<C-d>",              ACTION(CURSORS_NEXT)                        },
 	{ "<C-e>",              ACTION(WINDOW_SLIDE_UP)                     },
 	{ "<C-y>",              ACTION(WINDOW_SLIDE_DOWN)                   },
 	{ "<C-o>",              ACTION(JUMPLIST_PREV)                       },
@@ -269,8 +269,8 @@ static const KeyBinding bindings_visual[] = {
 	{ ":",                  ACTION(PROMPT_SHOW_VISUAL)                  },
 	{ "<C-b>",              ALIAS("<PageUp>")                           },
 	{ "<C-f>",              ALIAS("<PageDown>")                         },
-	{ "<C-u>",              ALIAS("<S-PageUp>")                         },
-	{ "<C-d>",              ALIAS("<S-PageDown>")                       },
+	{ "<C-u>",              ACTION(CURSORS_PREV)                        },
+	{ "<C-d>",              ACTION(CURSORS_NEXT)                        },
 	{ "x",                  ALIAS("d")                                  },
 	{ "r",                  ALIAS("c")                                  },
 	{ "s",                  ALIAS("c")                                  },
diff --git a/main.c b/main.c
index 8a0487b..bb6f8cf 100644
--- a/main.c
+++ b/main.c
@@ -48,6 +48,8 @@ static const char *cursors_align_indent(Vis*, const char *keys, const Arg *arg);
 static const char *cursors_clear(Vis*, const char *keys, const Arg *arg);
 /* remove the least recently added cursor */
 static const char *cursors_remove(Vis*, const char *keys, const Arg *arg);
+/* move to the previous (arg->i < 0) or next (arg->i > 0) cursor */
+static const char *cursors_navigate(Vis*, const char *keys, const Arg *arg);
 /* select the word the cursor is currently over */
 static const char *cursors_select(Vis*, const char *keys, const Arg *arg);
 /* select the next region matching the current selection */
@@ -244,6 +246,8 @@ enum {
 	VIS_ACTION_CURSORS_ALIGN_INDENT,
 	VIS_ACTION_CURSORS_REMOVE_ALL,
 	VIS_ACTION_CURSORS_REMOVE_LAST,
+	VIS_ACTION_CURSORS_PREV,
+	VIS_ACTION_CURSORS_NEXT,
 	VIS_ACTION_TEXT_OBJECT_WORD_OUTER,
 	VIS_ACTION_TEXT_OBJECT_WORD_INNER,
 	VIS_ACTION_TEXT_OBJECT_LONGWORD_OUTER,
@@ -929,6 +933,16 @@ static const KeyAction vis_action[] = {
 		"Remove least recently created cursor",
 		cursors_remove,
 	},
+	[VIS_ACTION_CURSORS_PREV] = {
+		"cursors-prev",
+		"Move to the previous cursor",
+		cursors_navigate, { .i = -PAGE_HALF }
+	},
+	[VIS_ACTION_CURSORS_NEXT] = {
+		"cursors-next",
+		"Move to the next cursor",
+		cursors_navigate, { .i = +PAGE_HALF }
+	},
 	[VIS_ACTION_TEXT_OBJECT_WORD_OUTER] = {
 		"text-object-word-outer",
 		"A word leading and trailing whitespace included",
@@ -1301,6 +1315,28 @@ static const char *cursors_remove(Vis *vis, const char *keys, const Arg *arg) {
 	return keys;
 }
 
+static const char *cursors_navigate(Vis *vis, const char *keys, const Arg *arg) {
+	View *view = vis_view(vis);
+	bool multiple_cursors = view_cursors_next(view_cursors(view));
+	if (!multiple_cursors)
+		return wscroll(vis, keys, arg);
+	Cursor *c = view_cursors_primary_get(view);
+	if (arg->i < 0) {
+		c = view_cursors_next(c);
+		if (!c)
+			c = view_cursors(view);
+	} else {
+		c = view_cursors_prev(c);
+		if (!c) {
+			c = view_cursors(view);
+			for (Cursor *n = c; n; n = view_cursors_next(n))
+				c = n;
+		}
+	}
+	view_cursors_primary_set(c);
+	return keys;
+}
+
 static const char *replace(Vis *vis, const char *keys, const Arg *arg) {
 	if (!keys[0])
 		return NULL;
-- 
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