fake update for fsfe website translations

fake-update.sh

#!/bin/bash

# --                                                            ; {{{1
#
# File        : fake-update.sh
# Maintainer  : Felix C. Stegerman <flx@fsfe.org>
# Date        : 2014-06-02
#
# Copyright   : Copyright (C) 2014  Felix C. Stegerman
# Licence     : AGPLv3+
#
# Usage       : fake-update.sh <file>
#
# Description:
#
#   Given an updated (and committed!) English xhtml file, determines
#   the date of the previous commit of that file and determines which
#   translations were not outdated (i.e. more than 2 hours older).  It
#   then asks whether to add <!-- fake-updated ... --> comments to
#   those files to fake-update them.  Then it shows the svn status and
#   asks the user whether to perform an svn diff and an svn commit.
#
# Example:
#
#   $ vim foo.en.xhtml    # fix some small error that should not
#                         # impact up-to-date translations
#   $ svn commit ...      # commit the fix
#   $ fake-update.sh      # fake-update the previously not-outdated
#                         # translations and commit
#
# --                                                            ; }}}1

set -e; shopt -s nullglob; set -o pipefail

export LC_ALL=C TZ=UTC

file="$1"
base="$( basename "$file" .en.xhtml )"

[ -n "$file" ] || { echo 'Usage: fake-update.sh <file>' >&2; exit 1; }

v () { test "$VERBOSE" = yes; }

# Usage: get_date <file> [<n>]
get_date () {
  local f="$1" n="${2:-1}"
  local date="$( svn log --non-interactive -l "$n" ./"$f" \
    | grep -E '^r[0-9]+ \|' | tail -n 1 \
    | sed -r 's!^.*\| ([0-9]{4}-[^\|]*) \|.*$!\1!' )"
  date +%s -d "$date"
}

now="$( date +'%F %T' )"
rev="$( svn log --non-interactive -l 1 "$file" | head -n 2 \
  | grep -Eo '^r[0-9]+' | head -n 1 )"

 cur_date="$( get_date "$file"   )"
prev_date="$( get_date "$file" 2 )"

! v || {
  echo "revision: $rev"
  echo "current  date: $cur_date"   "| $( date +'%F %T' -d "@$cur_date"  )"
  echo "previous date: $prev_date"  "| $( date +'%F %T' -d "@$prev_date" )"
}

not_outdated=()

for x in "$base".*.xhtml; do
  [[ "$x" != "$base".en.xhtml ]] || continue
  x_date="$( get_date "$x" )"
  ! v || echo "date of $x: $x_date" "| $( date +'%F %T' -d "@$x_date" )"
  if (( cur_date > x_date + 7200 && prev_date <= x_date + 7200 )); then
    not_outdated+=( "$x" )
    echo "$x was not outdated"
  fi
done

echo; read -r -p 'fake-update? [Yn] '
if [[ "$REPLY" != [Nn]* ]]; then
  for x in "${not_outdated[@]}"; do
    echo "<!-- fake-updated $now; see $rev -->" >> "$x"
  done
else
  exit 0
fi

echo; echo '==> svn status'
svn status

echo; read -r -p 'diff? [Yn] '
[[ "$REPLY" = [Nn]* ]] || svn diff

echo; read -r -p 'commit? [Yn] '
[[ "$REPLY" = [Nn]* ]] || svn commit -m "fake-updated translations of $file"