interactive: refactor code asking the user for interactive input

There are quite a few code locations (e.g. `git clean --interactive`)
where Git asks the user for an answer. In preparation for fixing a bug
shared by all of them, and also to DRY up the code, let's refactor it.

Please note that most of these callers trimmed white-space both at the
beginning and at the end of the answer, instead of trimming only the
end (as the caller in `add-patch.c` does).

Therefore, technically speaking, we change behavior in this patch. At
the same time, it can be argued that this is actually a bug fix.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/prompt.c b/prompt.c
index 6d5885d009..098dcfb7cf 100644
--- a/prompt.c
+++ b/prompt.c
@@ -74,3 +74,13 @@ char *git_prompt(const char *prompt, int flags)
 	}
 	return r;
 }
+
+int git_read_line_interactively(struct strbuf *line)
+{
+	int ret = strbuf_getline_lf(line, stdin);
+
+	if (ret != EOF)
+		strbuf_trim_trailing_newline(line);
+
+	return ret;
+}