From 54922dc3439266328c4f03c2087dd64bc4d9be64 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Wed, 10 Aug 2016 09:08:22 -0300
Subject: [PATCH] eeshow/: option  -N depth  to limit history depth; -N-depth
 exits after parsing

---
 eeshow/gui.c  | 21 ++++++++++++---------
 eeshow/gui.h  |  2 +-
 eeshow/main.c | 21 +++++++++++++--------
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/eeshow/gui.c b/eeshow/gui.c
index 98b6081..136a152 100644
--- a/eeshow/gui.c
+++ b/eeshow/gui.c
@@ -996,7 +996,7 @@ struct add_hist_ctx {
 	int n_args;
 	char **args;
 	bool recurse;
-unsigned limit;
+	unsigned limit;
 };
 
 
@@ -1008,9 +1008,10 @@ static void add_hist(void *user, struct hist *h)
 	const struct sheet *sch;
 	unsigned age = 0;
 
-if (!ahc->limit)
-	return;
-ahc->limit--;
+	if (!ahc->limit)
+		return;
+	ahc->limit--;
+
 	for (anchor = &ctx->hist; *anchor; anchor = &(*anchor)->next)
 		age++;
 	*anchor = alloc_type(struct gui_hist);
@@ -1024,7 +1025,7 @@ ahc->limit--;
 
 
 static void get_revisions(struct gui_ctx *ctx,
-    int n_args, char **args, bool recurse)
+    int n_args, char **args, bool recurse, int limit)
 {
 	const char *sch_name = args[n_args - 1];
 	struct add_hist_ctx add_hist_ctx = {
@@ -1032,7 +1033,7 @@ static void get_revisions(struct gui_ctx *ctx,
 		.n_args		= n_args,
 		.args		= args,
 		.recurse	= recurse,
-.limit = 30,
+		.limit		= limit < 0 ? -limit : limit,
 	};
 
 	if (!vcs_git_try(sch_name)) {
@@ -1045,7 +1046,7 @@ static void get_revisions(struct gui_ctx *ctx,
 }
 
 
-int gui(unsigned n_args, char **args, bool recurse)
+int gui(unsigned n_args, char **args, bool recurse, int limit)
 {
 	GtkWidget *window;
 	struct gui_ctx ctx = {
@@ -1060,7 +1061,7 @@ int gui(unsigned n_args, char **args, bool recurse)
 		.old_hist	= NULL,
 	};
 
-	get_revisions(&ctx, n_args, args, recurse);
+	get_revisions(&ctx, n_args, args, recurse, limit);
 	for (ctx.new_hist = ctx.hist; ctx.new_hist && !ctx.new_hist->sheets;
 	    ctx.new_hist = ctx.new_hist->next);
 	if (!ctx.new_hist) {
@@ -1107,7 +1108,9 @@ int gui(unsigned n_args, char **args, bool recurse)
 	go_to_sheet(&ctx, ctx.new_hist->sheets);
 	gtk_widget_show_all(window);
 
-	gtk_main();
+	/* for performance testing, use -N-depth */
+	if (limit >= 0)
+		gtk_main();
 
 	return 0;
 }
diff --git a/eeshow/gui.h b/eeshow/gui.h
index c5528d6..1976a20 100644
--- a/eeshow/gui.h
+++ b/eeshow/gui.h
@@ -20,6 +20,6 @@
  * and there is no NULL at the end.
  */
 
-int gui(unsigned n_args, char **args, bool recurse);
+int gui(unsigned n_args, char **args, bool recurse, int limit);
 
 #endif /* !GUI_H */
diff --git a/eeshow/main.c b/eeshow/main.c
index 0960015..e678df6 100644
--- a/eeshow/main.c
+++ b/eeshow/main.c
@@ -47,17 +47,18 @@ static struct gfx_ops const *ops_list[] = {
 void usage(const char *name)
 {
 	fprintf(stderr,
-"usage: %s [gtk_flags] [-r] [[rev:]file.lib ...] [rev:]file.sch\n"
+"usage: %s [gtk_flags] [-r] [-N n] [[rev:]file.lib ...] [rev:]file.sch\n"
 "       %s [-r] [-v ...] [[rev:]file.lib ...] [rev:]file.sch\n"
 "       %*s[-- driver_spec]\n"
 "       %s [-v ...] -C [rev:]file\n"
 "       %s [-v ...] -H path_into_repo\n"
 "\n"
-"  rev  git revision\n"
-"  -r   recurse into sub-sheets\n"
-"  -v   increase verbosity of diagnostic output\n"
-"  -C   'cat' the file to standard output\n"
-"  -H   show history of repository on standard output\n"
+"  rev   git revision\n"
+"  -r    recurse into sub-sheets\n"
+"  -v    increase verbosity of diagnostic output\n"
+"  -C    'cat' the file to standard output\n"
+"  -H    show history of repository on standard output\n"
+"  -N n  limit history to n revisions\n"
 "\n"
 "No driver spec: enter GUI\n"
 "\n"
@@ -96,6 +97,7 @@ int main(int argc, char **argv)
 	const char *cat = NULL;
 	const char *history = NULL;
 	const char *fmt = NULL;
+	int limit = 0;
 	char c;
 	int arg, dashdash;
 	bool have_dashdash = 0;
@@ -112,7 +114,7 @@ int main(int argc, char **argv)
 	if (!have_dashdash)
 		gtk_init(&argc, &argv);
 
-	while ((c = getopt(dashdash, argv, "rvC:F:H:")) != EOF)
+	while ((c = getopt(dashdash, argv, "rvC:F:H:N:")) != EOF)
 		switch (c) {
 		case 'r':
 			recurse = 1;
@@ -129,6 +131,9 @@ int main(int argc, char **argv)
 		case 'H':
 			history = optarg;
 			break;
+		case 'N':
+			limit = atoi(optarg);
+			break;
 		default:
 			usage(*argv);
 		}
@@ -173,7 +178,7 @@ int main(int argc, char **argv)
 		memcpy(args, argv + optind, sizeof(const char *) * n);
 	
 		optind = 0; /* reset getopt */
-		return gui(n, args, recurse);
+		return gui(n, args, recurse, limit);
 	}
 
 	sch_init(&sch_ctx, recurse);