gpg-interface: add function for converting trust level to string

Add new helper function `gpg_trust_level_to_str()` which will
convert a given member of `enum signature_trust_level` to its
corresponding string (in lowercase). For example, `TRUST_ULTIMATE`
will yield the string "ultimate".

This will abstract out some code in `pretty.c` relating to gpg
signature trust levels.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Jaydeep Das <jaydeepjd.8914@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/gpg-interface.h b/gpg-interface.h
index b30cbdcd3d..8a9ef41779 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -71,6 +71,14 @@ size_t parse_signed_buffer(const char *buf, size_t size);
 int sign_buffer(struct strbuf *buffer, struct strbuf *signature,
 		const char *signing_key);
 
+
+/*
+ * Returns corresponding string in lowercase for a given member of
+ * enum signature_trust_level. For example, `TRUST_ULTIMATE` will
+ * return "ultimate".
+ */
+const char *gpg_trust_level_to_str(enum signature_trust_level level);
+
 int git_gpg_config(const char *, const char *, void *);
 void set_signing_key(const char *);
 const char *get_signing_key(void);