pre-commit

#!/bin/bash

# Pre-commit Git hook. This currently just calls utilities/optimise_thumbnail.py
# which makes a smaller copy of the header image for all articles.
# To use: run `cp utilities/pre-commit .git/hooks`
CYAN="\e[36m"
RED="\e[31m"
GREEN="\e[92m"
CLEAR="\e[39m"

# Run optimise_thumbnail.py and print out files that need to be thumbnailised to a
# temporary file
# NOTE: This script runs through all articles. So if there are past articles without
# a thumbnail, a thumbnail will be created and the old article will be edited and
# staged too
run_optimise_thumbnail_script() {
    # Get the root of the project
    local root="$(git rev-parse --show-toplevel)"
    # Create a temp file to write the python script output to
    # -t flag is needed to ensure OSX usability, as recommended in
    # https://tinyurl.com/ycx922hd
    local temp=$(mktemp -p ${root} -t)

    echo -e "${CYAN}Optimising thumbnails...${CLEAR}"
    # Check if pipenv is a global or a user install in the your machine
    if hash pipenv 2>/dev/null; then
        pipenv run --three python3 "${root}/utilities/optimise_thumbnail.py" $root > $temp
    else
        python3 -m pipenv run --three "${root}/utilities/optimise_thumbnail.py" \
                $root > $temp
    fi
    if [[ $? -gt 0 ]]; then
        echo -e "${RED}There was a problem running the optimiser. Please try again.${CLEAR}"
        exit 1
    fi
    echo -e "${GREEN}Thumbnail creation complete! Staging these new changes...\
            ${CLEAR}"
    # Read each line from the temp file to stage the thumbnailised files to commit
    while IFS='' read -r line || [[ -n "$line" ]]; do
        echo -e "${CYAN}Adding to commit:${CLEAR} $line"
        git add $line
    done < $temp
    # Delete the temp file
    rm $temp
    # Pause for a bit so that you can see what's goin' on
    polite_notice="${CYAN}The bottom blurb in your commit message window may not \
            say that some of the files above are staged. They actually are. Why? \
            Don't worry about it${CLEAR}"
    echo -e $polite_notice
    sleep 4
}

### Script starts here ###
# AWK command to check if:
# 1. A staged file is an article; and
# 2. We aren't removing the file, but adding/modifying it
# Our function parameter will be a line from git diff --cached --name-status
this_is_the_question="$(git diff --cached --name-status \
    | awk '$1 != "D" { print $2 }' \
    | awk '/^_posts\/articles/ { print $1 }')"
# If the above test passes, run the function above
if [[ ! -z $this_is_the_question ]]; then
    echo $this_is_the_question
    echo -e "${CYAN}Running thumbnail creation script...${CLEAR}"
    run_optimise_thumbnail_script
fi