.githelpers

#!/bin/bash

# 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.

PLAINHASH="%h"
HASH="%C(yellow)%h%Creset"
RELATIVE_TIME="%Cgreen(%ai)%Creset"
AUTHOR="%C(bold blue)<%an>%Creset"
REFS="%C(red)%d%Creset"
SUBJECT="%s"

FORMAT="$HASH}}}}$RELATIVE_TIME}}}}$AUTHOR}}}}$REFS $SUBJECT"
FORMAT_NO_REFS="$HASH}}}}$RELATIVE_TIME}}}}$AUTHOR}}}}$SUBJECT"
FORMAT2="$HASH}}}}$RELATIVE_TIME}}}}XXX<$PLAINHASH>XXX}}}}$AUTHOR}}}}$REFS $SUBJECT"

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

pretty_git_topo_log() {
    git log --pretty="tformat:${FORMAT}" $* |
        # Replace (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)/' |
        # Replace }}}}s with daggers
        sed -Ee 's/}}}}/†/g' |
        # Line columns up based on dagger
        column -s '†' -t |
        # Page only if we need to
        less -FXRS
}

pretty_git_topo_log_no_branch_names() {
    git log --pretty="tformat:${FORMAT_NO_REFS}" $* |
        # Replace (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)/' |
        # Replace }}}}s with daggers
        sed -Ee 's/}}}}/†/g' |
        # Line columns up based on dagger
        column -s '†' -t
}

pretty_git_log() {
    git log --graph --pretty="tformat:${FORMAT}" $* |
        # Replace (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)/' |
        # Replace }}}}s with daggers
        sed -Ee 's/}}}}/†/g' |
        # Line columns up based on dagger
        column -s '†' -t |
        # Page only if we need to
        less -FXRS
}

pretty_git_branches() {
  git for-each-ref \
    --sort=-committerdate refs/heads/ refs/remotes/ \
    --format='%(color:red)%(objectname:short)%(color:reset)}}}}(%(color:green)%(committerdate:iso8601)%(color:reset))}}}}%(authorname)}}}}%(color:yellow)%(refname:short)%(color:reset)}}}}%(contents:subject)' \
    $* |
    # Replace (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)/' |
    # Replace }}}}s with daggers
    sed -Ee 's/}}}}/†/g' |
    # Line columns up based on dagger
    column -s '†' -t |
    # Page only if we need to
    less -FXRS
}

commits_range_from_head() {
  local branch="$1"
  local head="${2:-HEAD}"
  echo "$(git merge-base "$branch" "$head")".."$branch"
}

branch_commits_range_from_head() {
  (
    set -eu
    branch="$1"
    head="${2:-HEAD}"
    pretty_git_topo_log_no_branch_names "$(commits_range_from_head "$branch" "$head")"
  )
}

files_in_branch() {
  (
    set -eu
    branch="$1"
    head="${2:-HEAD}"

    files_in_range "$(commits_range_from_head "$branch" "$head")"
  )
}

files_in_range() {
  # git diff-tree --no-commit-id --name-only -r "$(. ~/.githelpers && commits_range_from_head HEAD develop)"
  (
    set -eu
    git diff-tree --no-commit-id --name-only -r "$1"
  )
}

filestats() {
  while read entry; do
    line="$(printf "%s" "$entry" | sed -e 's/XXX<.*>XXX//g')"
    hash="$(printf "%s" "$entry" | sed -E 's/.*XXX\<([0-9a-f]+)\>XXX.*/\1/')"

    printf "%s" "$line"

    if ! [ "$hash" = "$entry" ]; then
      stat="$(
        git diff-tree --no-commit-id -r --dirstat=lines $hash | tail -1 | cut -d'/' -f1-3 | sed -E 's/^ +//g')"
      echo " [$stat]"
    else
      echo ""
    fi
  done
}

pretty_git_log2() {
    git log --graph --pretty="tformat:${FORMAT2}" $* |
        # Replace (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)/' |
        # Replace }}}}s with daggers
        sed -Ee 's/}}}}/†/g' |
        # Line columns up based on } delimiter
        column -s '†' -t |
        # Page only if we need to
        filestats |
        less -FXRS
}