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#!/usr/bin/awk -f
# Adds the first tag containing a commit for each git-log entry.
# `git log --color` and `git log --graph` are supported. --oneline is not
# supported (yet).
# If there is no tag after the commit, no description is shown.
#
# Optional variables:
# -vcache={0|1} Enable a cache for git describe outputs. If set to 1,
# .git/describe-cache.d/ as default cache_dir.
# -vcache_dir=DIR Use DIR to store cached git-describe results. DIR will
# be created if non-existent. Implies -vcache=1.
# -vcache_ro={0|1} Set to 1 to prevent creating new files in cache.
#
# NOTE: when cache is enabled, one must clear it when the `git describe` options
# are changed (see variable "opts" below) or when a new tag is added before an
# existing tag.
#
# Copyright (c) 2013 Peter Wu <lekensteyn@gmail.com>
# Licensed under GPLv3 or any latter version
BEGIN {
if (!cache_dir && cache) {
# Use directory in .git/ as default.
cmd = "git rev-parse --show-toplevel";
cmd | getline cache_dir;
close(cmd);
if (cache_dir)
cache_dir = cache_dir "/.git/describe-cache.d";
}
if (cache_dir) {
# Skip cache directory if non-existent and read only or if the
# directory cannot be created.
if (cache_ro && !is_dir(cache_dir) || !mkdir_p(cache_dir))
cache_dir = "";
}
# Use `git-describe --contains` to show which tag contains this commit.
opts = "--contains";
}
{ print; }
{
is_color = has_color($0);
# strip color escapes for easier text matching
gsub(/\033\[[0-9;]*m/, "");
text_len = length($0);
# remove --graph markers
sub(/^[*|][*|_/\\ ]*/, "");
indent_len = length($0) - text_len;
}
# match only git's "commit" label, not something from the commit message.
$0 ~ /^commit/ &&
$1 == "commit" && $2 ~ /^[0-9a-f]{4,40}$/ {
hash = $2;
desc = git_describe(hash);
if (desc) {
printf("%" indent_len "sDescribe: ", "");
if (is_color)
print "\033[96m" desc "\033[m"; # light cyan
else
print desc;
}
}
# Helper functions
function shellescape(arg) {
gsub(/'/, "'\\''", arg);
return "'" arg "'";
}
function is_dir(path) {
return system("test -d " shellescape(path)) == 0;
}
function mkdir_p(dir) {
return system("mkdir -p -- " shellescape(dir)) == 0;
}
function has_color(str) {
if (str ~ /\033/) return 1;
return 0;
}
# Show the name matching the sha1 hash (consisting of 4-40 hexadecimals).
function git_describe(hash) {
desc = "";
if (length(hash) != 40) {
cmd = "git rev-parse --default " hash;
cmd | getline hash;
close(cmd);
if (length(hash) != 40) return "";
}
# try cached output if enabled/any.
if (cache_dir) {
cache_subdir = cache_dir "/" substr(hash, 1, 2);
cache_file = cache_subdir "/" substr(hash, 3);
getline desc < cache_file;
close(cache_file);
}
# cache entry was unavailable, get a description now.
if (!desc) {
cmd = "git describe " opts " " hash " 2>/dev/null";
cmd | getline desc;
close(cmd);
# write description to cache if allowed.
if (cache_dir && desc && !cache_ro) {
mkdir_p(cache_subdir);
print desc > cache_file;
close(cache_file);
}
}
return desc;
}
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