tweet automatically if you have new posts.

pre-push

#!/bin/sh
# you need to write title in Front Matter of each post like:
#   ---
#   title: SOME TITLE
#   ---
# require:
#   https://github.com/shokai/tw

tw_ID="{{ your twitter ID registered in tw }}"
cname="{{ your GitHub Pages' CNAME }}"
permalink="{{ your jekyll permalink of posts }}"
auto_tweet=1 # 0 to disable
nnnn="\([0-9]\{4\}\)"
nn="\([0-9]\{2\}\)"

# url will be:
#   https://${cname}/${permalink}/yyyy/mm/dd/title

function get_added() {
    git diff remotes/origin/HEAD --name-only --diff-filter=A \
        | grep -e "^_posts/[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}-.\+\.md"
}

function extract_pname() {
    echo $1 \
        | sed -ne "s/^_posts\/${nnnn}-${nn}-${nn}-\(.*\).md/\1\/\2\/\3\/\4/p"
}


# tweet added post
for post in `get_added`;do
    if [[ $auto_tweet -ne 0 ]];then
        ans="y"
    else
        echo "You have added new post: ${post}"
        echo "tweet this? [y/N]"
        read ans
    fi
    if [[ $ans =~ ^[Yy]* ]];then
        title=`grep -e "^title: " ${post} | cut -d' ' -f2`
        post_page=`extract_pname ${post}`
        url="https://${cname}/${permalink}/${post_page}"
        tweet="A new post in my blog \"${title}\" ${url}"
        tw ${tweet} --user=${tw_ID} --yes
    fi
done