.functions

#!/usr/bin/env bash
# shellcheck shell=sh disable=SC2312,SC2015

# print log messages to STDOUT if $DEBUG is true
# for info how to format check out the manpage of printf
debuglog() {
    if [ -n "${BASH_VERSION}" ]; then
        __source="${BASH_SOURCE[1]:-${BASH_SOURCE[0]:-${0}}}"
    elif [ -n "${ZSH_VERSION}" ]; then
        __source="${funcstack:+${funcstack[2]}}"
    else
        __source="${FUNCNAME:-${0}}"
    fi
    if [ "${DEBUG:+${DEBUG}}" = "true" ]; then
        # shellcheck disable=SC2059
        __logmsg="$(printf "$@")"
        __date=$(date "+%T")
        printf "[%s][%s] %s\n" "${__date}" "${__source##*/}" "${__logmsg}"
        unset -v __source
    fi
}

# prepend dir to fpath if dir exists
prepend_fpath() {
    if [ $# -ne 1 ]; then
        printf "Usage: %s <path>" "${BASH_SOURCE:-$0}"
        return 1
    elif [ ! -d "$1" ]; then
        printf "%s Error:\n\t%s is not a directory" "${BASH_SOURCE:-$0}" "${1}"
        return 1
    elif [ -d "${1}" ] && echo "${SHELL}" | grep -q "zsh"; then
        _cleaned=$(echo "$FPATH" | sed "s#:${1}:#:#g")
        export FPATH="${1}${_cleaned:+:$_cleaned}" \
            && debuglog "prepend_fpath: %s" "${1}"
        unset _escaped _cleaned
    fi
}

# prepend dir to path if dir exists
prepend_path() {
    if [ $# -ne 1 ]; then
        printf "Usage: %s <path>" "${0}"
        return 1
    elif [ ! -d "${1}" ]; then
        printf "%s Error:\n\t%s is not a directory" "${BASH_SOURCE:-$0}" "${1}"
        return 1
    else
        _cleaned=$(echo "$PATH" | sed "s#:${1}:#:#g")
        export PATH="${1}${_cleaned:+:$_cleaned}" \
            && debuglog "prepend_path: %s" "${1}"
        unset _escaped _cleaned
    fi
}

# initialize brew
brew_init() {
    # fail if no or to many arguments are provided
    if [ $# -ne 1 ]; then
        printf "Usage: %s <brew_prefix>\n" "${BASH_SOURCE:-$0}"
        return 1
    # check if brew is available and initialize
    elif [ -x "${1}/bin/brew" ]; then
        # add brew to shell environment
        eval "$("${1}/bin/brew" shellenv)" \
            && debuglog "brew_init: brew initialized" \
            || true
        # set brew bundle file
        export HOMEBREW_BUNDLE_FILE="${HOME}/.local/Brewfile"
        # enable autoremove
        export HOMEBREW_AUTOREMOVE=1
        # enable bat
        if command -v bat >/dev/null 2>&1; then
            export HOMEBREW_BAT=1
        fi
        # add fpaths if dirs exist
        if [ -d "${1}/share/zsh/site-functions" ]; then
            prepend_fpath "${1}/share/zsh/site-functions"
        fi
        if [ -d "${1}/share/zsh-completions" ]; then
            prepend_fpath "${1}/share/zsh-completions"
        fi
        if validate_command pyenv; then
            # remove pyenv shims from PATH before calling brew
            alias brew='env PATH="${PATH//$(pyenv root)\/shims:/}" brew'
        fi
    fi
}

# validate command exists
validate_command() {
    if [ $# -ne 1 ]; then
        printf "Usage: validate_command <command>\n"
        return 1
    elif ! command -v "$1" >/dev/null 2>&1; then
        debuglog "%s not found" "$1"
        return 1
    else
        return 0
    fi
}

# view markdown files
viewmd() {
    if [ $# -ne 1 ]; then
        printf "Usage: viewmd <path to md file>"
        return 1
    elif ! validate_command pandoc; then
        printf "viewmd: Error: pandoc not found"
    elif ! validate_command w3m; then
        printf "viewmd: Error: w3m not found"
    else
        pandoc -f markdown -t html "$1" | w3m -T text/html -o display_image=true
    fi
}

# view git flavored markdown files
viewgitmd() {
    if [ $# -ne 1 ]; then
        printf "Usage: viewgitmd <path to md file>"
        return 1
    elif ! validate_command pandoc; then
        printf "Error: pandoc not found"
    elif ! validate_command w3m; then
        printf "Error: w3m not found"
    else
        pandoc -f gfm -t html "$1" | w3m -T text/html -o display_image=true
    fi
}