[PATCH 2/2] pretty: allow "max-size" magic for all placeholders

[Jeff King <peff@peff.net>]

You can now truncate a given placeholder to no more than a
certain number of characters with something like "%30s".

Signed-off-by: Jeff King <peff@peff.net>
---
This just uses the made-up "%30s" syntax, but you could easily tweak it
to handle "%.30s" or whatever.

 pretty.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/pretty.c b/pretty.c
index 7b4d098..06d96a7 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1019,6 +1019,7 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 {
 	int consumed;
 	int magic_len = 0;
+	int max_len = 0;
 	size_t orig_len;
 	enum {
 		NO_MAGIC,
@@ -1045,9 +1046,22 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
 		placeholder++;
 	}
 
+	if (isdigit(placeholder[0])) {
+		char *end;
+		max_len = strtoul(placeholder, &end, 10);
+		magic_len += (end - placeholder);
+		placeholder = end;
+	}
+
 	orig_len = sb->len;
 	consumed = format_commit_one(sb, placeholder, context);
 
+	if (max_len) {
+		size_t end = orig_len + max_len;
+		if (end < sb->len)
+			strbuf_setlen(sb, end);
+	}
+
 	if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
 		while (sb->len && sb->buf[sb->len - 1] == '\n')
 			strbuf_setlen(sb, sb->len - 1);
-- 
1.7.8.1.3.gba11d