git-tiny-log.bash

#!/usr/bin/env bash

set -o errexit   # exit if a command fails
set -o nounset   # exit if an unset variable is used
set -o pipefail  # inherit exit code of any command in the pipe
#set -o xtrace   # enable trace debugging

# create a color escape sequence from an r, g, b triplet
# $1, $2, $3 (r, g, b) must be in the range [0..5]
color()       { echo -e "\x1b[38;5;$(( 16 + $1 * 36 + $2 * 6 + $3 ))m"; }
color_reset() { echo -e "\x1b[0m"; }

# git colors (override with shell export)
: ${GIT_COLOR_HASH:=$(color 3 3 0)}
: ${GIT_COLOR_DATE:=$(color 3 0 0)}
: ${GIT_COLOR_AUTHOR:=$(color 0 2 3)}
: ${GIT_COLOR_DECORATION:=$(color 0 3 0)}
: ${GIT_COLOR_SUBJECT:=$(color_reset)}
: ${GIT_COLOR_RESET:=$(color_reset)}

# field length variables
: ${COLUMNS:=100}  # number of columns in the window (override with shell export)
hash_size=10       # max length of the hash
date_size=5        # max length of the date field
author_size=10     # max length of the author field
gap_size=1         # gap between fields
previous_decoration=

# get current day (mm-dd) and year (yyyy) - match git log date format
isodate=$(date +%Y-%m-%d)
today_mmdd=${isodate#*-}
today_yyyy=${isodate%%-*}

# format the log so we can tear it apart
git log --pretty="#^%H^%ci^%aN^%d^%s" "${@}" |

# format it like a ^barbarian
while IFS='^' read -r mark hash commitdate author decoration subject; do
#    # ignore any output except specific format
#    [[ $mark != *# ]] && continue;

    # massage the mark (it may contain the graph)
    mark="${mark%#*}"
    mark_size=${#mark}

    # massage the author string
    author="${author% (*}"  # drop "(Studio)" suffix

    # massage commitdate string
    # HH:MM if today
    # mm-dd if this year
    # mm/yy otherwise
    commitdate_yyyy="${commitdate%%-*}"
    if [[ $today_yyyy != $commitdate_yyyy ]]; then
        commitdate_yy="${commitdate_yyyy#??}"
        commitdate_mm="${commitdate%% *}"
        commitdate_mm="${commitdate_mm#*-}"
        commitdate_mm="${commitdate_mm%-*}"
        commitdate="${commitdate_mm}/${commitdate_yy}"
    else
        commitdate="${commitdate%:*}"        # remove seconds and gmt offset
        commitdate="${commitdate#*-}"        # remove yyyy-
        commitdate="${commitdate/${today_mmdd} /}"  # remove mm-dd (if today), leaving HH:MM
        commitdate="${commitdate% *}"        # remove HH:MM, leaving mm-dd
    fi

    # massage decoration string
    decoration="${decoration%$previous_decoration}"  # remove last decoration (drop dupes)
    decoration_size=${#decoration}                   # size of the decoration (including space)
    decoration="${decoration:1}"                     # remove the leading space

    # compute size left for the subject
    size=$(( $COLUMNS - $mark_size - $hash_size - $date_size - $author_size - $decoration_size - $gap_size * 3 ))
    size=$(( $size < 0 ? 0 : $size ))

    # chop fields down
    hash="${hash:0:$hash_size}"
    author="${author:0:$author_size}"
    subject="${subject:0:${size}}"

    # print the format with color
    printf "%s" "$mark"
    printf "%b%-${hash_size}s%${gap_size}s" "${GIT_COLOR_HASH}" "$hash" " "
    printf "%b%-${date_size}s%${gap_size}s" "${GIT_COLOR_DATE}" "$commitdate" " "
    printf "%b%-${author_size}s%${gap_size}s" "${GIT_COLOR_AUTHOR}" "$author" " "
    ${decoration:+printf "%b%s " "${GIT_COLOR_DECORATION}" "$decoration"}
    printf "%b%s" "${GIT_COLOR_SUBJECT}" "$subject"
    printf "%b\n" "${GIT_COLOR_RESET}"

    previous_decoration="$decoration"
done |

# drop into the pager
exec ${GIT_PAGER:-${PAGER}}

This is great! I'd like to modify it a little and maybe distribute it to my team. Is it available under a FOSS license?

Go for it. Consider it public domain. It was written by a friend and me. FWIW, I've been invoking it like this by default for many years: alias gtl='git tiny-log -15'. It also passes extra args on to git log, so you can do things like gtl --graph, if you want.

Do you just put this script in /usr/bin/env and then make the alias in your .bashrc file? Also, Is the "Consider it public domain" enough for formalities? I'd love to see a license added in a comment inside the script.

@edgewood

This is great! I'd like to modify it a little and maybe distribute it to my team. Is it available under a FOSS license?

Curious as to what modifications you would make.

@zkSNARK

Curious as to what modifications you would make.

Making the field length variables configurable.