.githelpers

#!/bin/bash
# Should be in ~/.githelpers and its used it gitconfig
# Log output:
#
# * 51c333e    (12 days)    <Gary Bernhardt>   add vim-eunuch
#
# The time massaging regexes start with ^[^<]* because that ensures that they
# only operate before the first "<". That "<" will be the beginning of the
# author name, ensuring that we don't destroy anything in the commit message
# that looks like time.
#
# The log format uses } characters between each field, and `column` is later
# used to split on them. A } in the commit subject or any other field will
# break this.


filter1() {
  if [[ "$platform" == 'macosx' ]]; then
    sed -Ee 's/(^[^<]*) ago)/\1)/' 
  else
    ruby -e 'puts $stdin.read.gsub(/(^[^<]*) ago\)/, "\\1)")'
  fi
}

filter2() {
  if [[ "$platform" == 'macosx' ]]; then
    sed -Ee 's/(^[^<]*), [[:digit:]]+ .*months?)/\1)/'
  else
    ruby -e 'puts $stdin.read.gsub(/(^[^<]*), [[:digit:]]+ .*months?\)/, "\\1)")'
  fi
}

platform='unknown'
unamestr=`uname`
if [[ "$unamestr" == 'Linux' ]]; then
  platform='linux'
elif [[ "$unamestr" == 'Darwin' ]]; then
  platform='macosx'
fi

if [[ "$platform" == 'macosx' ]]; then
  #colorized output (because column is aware of escape codes)
  HASH="%C(yellow)%h%Creset"
  RELATIVE_TIME="%Cgreen(%ar)%Creset"
  AUTHOR="%C(bold blue)<%an>%Creset"
  REFS="%C(red)%d%Creset"
  SUBJECT="%s"
else 
  # dont use colors as column in linux doesn support escape codes
  HASH="%h"
  RELATIVE_TIME="(%ar)"
  AUTHOR="<%an>"
  REFS="%d"
  SUBJECT="%s"
fi


FORMAT="$HASH}$RELATIVE_TIME}$AUTHOR}$REFS $SUBJECT"

show_git_head() {
  pretty_git_log -1
  git show -p --pretty="tformat:"
}

pretty_git_log() {
  git log  --graph --pretty="tformat:${FORMAT}" $* |
  iconv -c -t UTF-8 | # drop invalid UTF-8 characters
  filter1 | # Replace (2 years ago) with (2 years)
  filter2 | # Replace (2 years, 5 months) with (2 years)
  column -s '}' -t | # Line columns up based on } delimiter
  less -FXRS # Page only if we need to
}