From 54efb62b1e6a270db94f9395e9934aec002eee3e Mon Sep 17 00:00:00 2001
From: Jonas Fonseca <fonseca@diku.dk>
Date: Sun, 4 Jun 2006 01:53:32 +0200
Subject: [PATCH] Implement the basic controlling of revision graph
 visualization

It is toggleable via 'g', on by default, and restricted to max being 19
chars wide. Note, it still only shows just the left tee.
---
 manual.txt |  2 ++
 tig.c      | 49 +++++++++++++++++++++++++++++++++++--------------
 2 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/manual.txt b/manual.txt
index 4584cc1..b530f1c 100644
--- a/manual.txt
+++ b/manual.txt
@@ -250,6 +250,8 @@ v::
 	Show version.
 n::
 	Toggle line numbers on/off.
+g::
+	Toggle revision graph visualization on/off.
 ':'::
 	Open prompt. This allows you to specify what git command
 	to run. Example:
diff --git a/tig.c b/tig.c
index 9845c40..0f77167 100644
--- a/tig.c
+++ b/tig.c
@@ -47,6 +47,7 @@ static void load_help_page(void);
 
 #define SIZEOF_REF	256	/* Size of symbolic or SHA1 ID. */
 #define SIZEOF_CMD	1024	/* Size of command buffer. */
+#define SIZEOF_REVGRAPH	19	/* Size of revision ancestry graphics. */
 
 /* This color name can be used to refer to the default term colors. */
 #define COLOR_DEFAULT	(-1)
@@ -255,7 +256,8 @@ sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
 	REQ_(SCREEN_RESIZE,	"Resize the screen"), \
 	REQ_(SHOW_VERSION,	"Show version information"), \
 	REQ_(STOP_LOADING,	"Stop all loading views"), \
-	REQ_(TOGGLE_LINENO,	"Toggle line numbers"),
+	REQ_(TOGGLE_LINENO,	"Toggle line numbers"), \
+	REQ_(TOGGLE_REV_GRAPH,	"Toggle revision graph visualization"),
 
 
 /* User action requests. */
@@ -309,6 +311,7 @@ VERSION " (" __DATE__ ")\n"
 
 /* Option and state variables. */
 static bool opt_line_number	= FALSE;
+static bool opt_rev_graph	= TRUE;
 static int opt_num_interval	= NUMBER_INTERVAL;
 static int opt_tab_size		= TABSIZE;
 static enum request opt_request = REQ_VIEW_MAIN;
@@ -452,6 +455,10 @@ parse_options(int argc, char *argv[])
 }
 
 
+/*
+ * Line-oriented content detection.
+ */
+
 #define LINE_INFO \
 LINE(DIFF_HEADER,  "diff --git ",	COLOR_YELLOW,	COLOR_DEFAULT,	0), \
 LINE(DIFF_CHUNK,   "@@",		COLOR_MAGENTA,	COLOR_DEFAULT,	0), \
@@ -492,11 +499,6 @@ LINE(MAIN_DELIM,   "",			COLOR_MAGENTA,	COLOR_DEFAULT,	0), \
 LINE(MAIN_TAG,     "",			COLOR_MAGENTA,	COLOR_DEFAULT,	A_BOLD), \
 LINE(MAIN_REF,     "",			COLOR_CYAN,	COLOR_DEFAULT,	A_BOLD), \
 
-
-/*
- * Line-oriented content detection.
- */
-
 enum line_type {
 #define LINE(type, line, fg, bg, attr) \
 	LINE_##type
@@ -1482,6 +1484,11 @@ view_driver(struct view *view, enum request request)
 		redraw_display();
 		break;
 
+	case REQ_TOGGLE_REV_GRAPH:
+		opt_rev_graph = !opt_rev_graph;
+		redraw_display();
+		break;
+
 	case REQ_PROMPT:
 		/* Always reload^Wrerun commands from the prompt. */
 		open_view(view, opt_request, OPEN_RELOAD);
@@ -1713,11 +1720,13 @@ static struct view_ops pager_ops = {
  */
 
 struct commit {
-	char id[41];		/* SHA1 ID. */
-	char title[75];		/* The first line of the commit message. */
-	char author[75];	/* The author of the commit. */
-	struct tm time;		/* Date from the author ident. */
-	struct ref **refs;	/* Repository references; tags & branch heads. */
+	char id[41];			/* SHA1 ID. */
+	char title[75];			/* First line of the commit message. */
+	char author[75];		/* Author of the commit. */
+	struct tm time;			/* Date from the author ident. */
+	struct ref **refs;		/* Repository references. */
+	chtype graph[SIZEOF_REVGRAPH];	/* Ancestry chain graphics. */
+	size_t graph_size;		/* The width of the graph array. */
 };
 
 static bool
@@ -1780,9 +1789,19 @@ main_draw(struct view *view, struct line *line, unsigned int lineno)
 	if (type != LINE_CURSOR)
 		wattrset(view->win, A_NORMAL);
 
-	mvwaddch(view->win, lineno, col, ACS_LTEE);
-	wmove(view->win, lineno, col + 2);
-	col += 2;
+	if (opt_rev_graph && commit->graph_size) {
+		size_t i;
+
+		wmove(view->win, lineno, col);
+		/* Using waddch() instead of waddnstr() ensures that
+		 * they'll be rendered correctly for the cursor line. */
+		for (i = 0; i < commit->graph_size; i++)
+			waddch(view->win, commit->graph[i]);
+
+		col += commit->graph_size + 1;
+	}
+
+	wmove(view->win, lineno, col);
 
 	if (commit->refs) {
 		size_t i = 0;
@@ -1838,6 +1857,7 @@ main_read(struct view *view, char *line)
 		view->line[view->lines++].data = commit;
 		string_copy(commit->id, line);
 		commit->refs = get_refs(commit->id);
+		commit->graph[commit->graph_size++] = ACS_LTEE;
 		break;
 
 	case LINE_AUTHOR:
@@ -1972,6 +1992,7 @@ static struct keymap keymap[] = {
 	{ 'v',		REQ_SHOW_VERSION },
 	{ 'r',		REQ_SCREEN_REDRAW },
 	{ 'n',		REQ_TOGGLE_LINENO },
+	{ 'g',		REQ_TOGGLE_REV_GRAPH},
 	{ ':',		REQ_PROMPT },
 
 	/* wgetch() with nodelay() enabled returns ERR when there's no input. */
-- 
2.30.2