post-commit

#!/bin/sh

script_root_dir=$(dirname $0)

# requirements
. "${script_root_dir}/vendor/ini-parser.sh"

# read `~/.gitconfig` or a custom config file (`~/.gitconfig` by default)
custom_config_file_location=$1
config_file_location=""
if [[ $custom_config_file_location != "" ]]; then
    config_file_location=$custom_config_file_location
else
    config_file_location="${HOME}/.gitconfig"
fi

# read config
read_ini "${config_file_location}"

# transform the ${INI__ALL_VARS} to an array if it begins with 'INI__emails'
emails_array=()

IFS=' ' ini_variables=(${INI__ALL_VARS})
for variable in "${ini_variables[@]}"; do
    # check if the variable begins with 'INI__user__emails__'
    if [[ $variable == INI__emails__* ]]; then
        emails_array+=("${variable:13}=${!variable}") # 13 indicates the start of the folder name
    fi
done

if (( ${#emails_array[@]} == 0 )); then
    # exit if no emails were found in the configuration
    exit 0
fi

# get the current git config user.email
current_name=$(git config --get user.name)
current_email=$(git config --get user.email)

# figure out which email address to use
new_email=$current_email

# loop forwards (ending at the current directory) and check if any parent folders match a folder/name in a config file
for item in "${emails_array[@]}"; do
    IFS='=' keyvalue=(${item})
    folder_name=${keyvalue[0]}
    email=${keyvalue[1]}

    # break the current path string into an array
    currentPath=$(pwd)
    IFS='/' path_items=(${currentPath})
    for i in ${path_items[@]}; do
        if [[ $i == $folder_name ]]; then
            new_email=$email
            break 2
        fi
    done
done

if [[ $new_email != $current_email ]]; then    
    echo "Current email (${current_email}) does not match intended email (${new_email})."
    echo "Updating email to ${new_email}. Retrying..."

    # update email for future commits
    git config user.email "${new_email}"

    # then amend the previous commit
    git commit --amend --author="${current_name} <${new_email}>" --no-edit
fi

exit 0