publish_edition: automate using Dscho's ideas

Author: chriscool

publish_edition.sh

@@ -1,42 +1,87 @@
 #!/bin/sh
 
-cur=46
-next=47
+# TODO: Automate finding next publication date
+nextdate="2019-02-20"
 
-today="2018-12-19"
-nextdate="2019-01-23"
+# 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
 
-prev_month="November 2018"
-next_month="December 2018"
 
-# Find this commit using something like:
-# git log -1 --grep "Add draft for rn" --oneline
-last_draft_commit=5bc243932ea7938830757e8370df6bd86df39cab
+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 $repo_url"
+
+test -d "$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")
+
 
 # If needed make sure we are up-to-date
 
 git checkout master
-git pull origin master
+git pull horigin master
 
 # Publish current draft
 
-git mv rev_news/drafts/edition-$cur.md _posts/$today-edition-$cur.markdown
+git mv "$src_dir"/edition-$cur.md "$dst_dir"/$today-edition-$cur.markdown
 
-git commit -m "Publish rn-$cur in _posts/"
+git commit -m "Publish rn-$cur in $dst_dir/"
 
 # Create a draft for next edition
 
-git cherry-pick "$last_draft_commit" # Cherry pick commit with the last draft
+git cherry-pick "$last_draft_commit"
+
+git mv "$src_dir"/edition-$cur.md "$src_dir"/edition-$next.md
 
-git mv rev_news/drafts/edition-$cur.md rev_news/drafts/edition-$next.md
+# TODO: Use only one Perl invocation
 
-perl -pi -e "s/Edition $cur/Edition $next/g" rev_news/drafts/edition-$next.md
+perl -pi -e "s/Edition $cur/Edition $next/g" "$src_dir"/edition-$next.md
 
-perl -pi -e "s/${cur}th edition/${next}th edition/g" rev_news/drafts/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" rev_news/drafts/edition-$next.md
+perl -pi -e "s/$today/$nextdate/g" "$src_dir"/edition-$next.md
 
-perl -pi -e "s/$prev_month/$next_month/g" rev_news/drafts/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-$next" rev_news/drafts/edition-$next.md
+git commit --amend -m "Add draft for rn-$next" "$src_dir"/edition-$cur.md "$src_dir"/edition-$next.md