Git branch by time - get all branches, group them, sort them by last commit, and check if they're merged in the current branch

git_brt.sh

#!/bin/bash

HASH="%C(yellow)%h%Creset"
HASH_WHITE="%C(white)%h%Creset"

AUTHOR_RELATIVE_TIME="%Cgreen(%ar)%Creset"
COMMIT_RELATIVE_TIME="%Cgreen(%cr)%Creset"

AUTHOR="%C(bold blue)<%an>%Creset"
REFS="%C(red)%d%Creset"
UNIX_TIME="%ct"

SUBJECT="%C(magenta)%s%Creset"
SUBJECT_WHITE="%C(white)%s%Creset"


FORMAT="$HASH $AUTHOR_RELATIVE_TIME $AUTHOR $REFS $SUBJECT_WHITE"

BRANCH_FORMAT="$UNIX_TIME||$COMMIT_RELATIVE_TIME||$REFS|| ||$HASH_WHITE||# $SUBJECT"
BRANCH_FORMAT_NOT_MERGED="$UNIX_TIME||$COMMIT_RELATIVE_TIME||$REFS||+||$HASH||# $SUBJECT"

simplify_relative_date() {
  # Repalce (2 years ago) with (2 years)
  sed -Ee 's/(^[^<]*) ago\)/\1)/' |
  # Replace (2 years, 5 months) with (2 years)
  sed -Ee 's/(^[^<]*), [[:digit:]]+ .*months?\)/\1)/'
}

pager() {
  # Page only if we need to
  less -FXRS
}

all_refs() {
  git show-ref $* |
  # don't show tags
  grep -v tags |
  # get only the commit-id
  cut -d ' ' -f 1-1
}

show_refs() {
  for ref in $(all_refs $*)
  do
    if [ "$(git merge-base HEAD $ref)"  == $ref ]; then
      git log --no-walk --pretty=format:"${BRANCH_FORMAT}\n" $ref
    else
      git log --no-walk --pretty=format:"${BRANCH_FORMAT_NOT_MERGED}\n" $ref
    fi
  done
}


git_branch_by_time() {
  echo -e "$(show_refs $*)" |
  # sort refs by unix timestamp
  sort -nr |
  # git log --decorate groups all the refs that point to the same thing
  uniq |
  # simplify the relative date
  simplify_relative_date |
  # remove the unix timestamp |
  cut -d '|' -f2- |
  # escape special symbols so that column can work
  cat -v - |
  # format the output in columns
  column -t -s "|" |
  # replace the escaped symbols with real ones
  sed -Ee $'s/\^\[/\e/g' |
  pager
}