publish_edition.sh

#!/bin/sh

# TODO: Automate finding next publication date
nextdate="2019-02-20"

# TODO: Find the commit below using something like:
# TODO: git log -1 --grep "Add draft for rn" --oneline
# TODO: or better use a template
last_draft_commit=52c3265bc4485bc3db8262fd4a9907a99849e046


repo_url="https://github.com/git/git.github.io.git"
known_good_commit="5bc243932ea7938830757e8370df6bd86df39cab"
src_dir="rev_news/drafts"
dst_dir="_posts"

die() {
    printf >&2 "FATAL: %s\n" "$@"
    exit 1
}

# Basic checks

type git >/dev/null || die "git not found" "we need git"

git show "$known_good_commit" >/dev/null 2>&1 ||
	die "$known_good_commit not found" \
	    "we need to be in a repo cloned from $repo_url"

cur_branch=$(git rev-parse --abbrev-ref HEAD)
test "$cur_branch" = "master" || die "please switch to the 'master' branch"

test -d "$src_dir" || die "no source '$src_dir' directory"

test -d "$dst_dir" || die "no destination '$dst_dir' directory"

nb_ed=$(ls "$src_dir"/edition-*.md | wc -l)

test "$nb_ed" -eq 0 && die "no 'edition-*.md' file in '$src_dir' directory"

test "$nb_ed" -gt 1 && die "more than one 'edition-*.md' file in '$src_dir' directory"


# Find info we need

edition=$(ls "$src_dir"/edition-*.md)

cur=$(expr "$edition" : "rev_news/drafts/edition-\([0-9]\+\).md")

test -n "$cur" || die "'$edition' should contain a number"

next=$(expr "$cur" + 1)

today=$(date "+%Y-%m-%d")

# Each edition covers the previous month
next_month=$(LANG=C date "+%B %Y")
prev_month=$(LANG=C date --date="$today - 1 month" "+%B %Y")


# Publish current draft

git mv "$src_dir"/edition-$cur.md "$dst_dir"/$today-edition-$cur.markdown

git commit -m "Publish rn-$cur in $dst_dir/"

# Create a draft for next edition

git cherry-pick "$last_draft_commit"

git mv "$src_dir"/edition-$cur.md "$src_dir"/edition-$next.md

# TODO: Use only one Perl invocation

perl -pi -e "s/Edition $cur/Edition $next/g" "$src_dir"/edition-$next.md

# TODO: fix "th" when $cur or $next end with 1, 2 or 3
perl -pi -e "s/${cur}th edition/${next}th edition/g" "$src_dir"/edition-$next.md

perl -pi -e "s/$today/$nextdate/g" "$src_dir"/edition-$next.md

perl -pi -e "s/$prev_month/$next_month/g" "$src_dir"/edition-$next.md

git commit --amend -m "Add draft for rn-$next" "$src_dir"/edition-$cur.md "$src_dir"/edition-$next.md