# Simple calculator
calc() {
    local result=""
    result="$(printf "scale=10;%s\\n" "$*" | bc --mathlib | tr -d '\\\n')"
    #                        └─ default (when `--mathlib` is used) is 20

    if [[ "$result" == *.* ]]; then
        # improve the output for decimal numbers
        # add "0" for cases like ".5"
        # add "0" for cases like "-.5"
        # remove trailing zeros
        printf "%s" "$result" |
            sed -e 's/^\./0./'  \
            -e 's/^-\./-0./' \
            -e 's/0*$//;s/\.$//'
    else
        printf "%s" "$result"
    fi
    printf "\\n"
}

# Create a new directory and enter it
mkd() {
    mkdir -p "$@"
    cd "$@" || exit
}

# Make a temporary directory and enter it
tmpd() {
    local dir
    if [ $# -eq 0 ]; then
        dir=$(mktemp -d)
    else
        dir=$(mktemp -d -t "${1}.XXXXXXXXXX")
    fi
    cd "$dir" || exit
}

# Determine size of a file or total size of a directory
fs() {
    if du -b /dev/null > /dev/null 2>&1; then
        local arg=-sbh
    else
        local arg=-sh
    fi
    # shellcheck disable=SC2199
    if [[ -n "$@" ]]; then
        du $arg -- "$@"
    else
        du $arg -- .[^.]* *
    fi
}

# Use Git’s colored diff when available
if hash git &>/dev/null ; then
    diff() {
        git diff --no-index --color-words "$@"
    }
fi

# Convert HEX to the nearest color index (0-255)
fromhex(){
    hex=${1#"#"}
    r=$(printf '0x%0.2s' "$hex")
    g=$(printf '0x%0.2s' ${hex#??})
    b=$(printf '0x%0.2s' ${hex#????})
    echo '%03d' "$(( (r<75?0:(r-35)/40)*6*6 + 
                       (g<75?0:(g-35)/40)*6   +
                       (b<75?0:(b-35)/40)     + 16 ))"
}

# Create a new directory and enter it
mkd() {
    mkdir -p "$@" && cd "$_";
}

# Syntax-highlight JSON strings or files
# Usage: `json '{"foo":42}'` or `echo '{"foo":42}' | json`
json() {
    if [ -t 0 ]; then # argument
        python -mjson.tool <<< "$*" | pygmentize -l javascript;
    else # pipe
        python -mjson.tool | pygmentize -l javascript;
    fi;
}

# Get colors in manual pages
man() {
    env \
        LESS_TERMCAP_mb="$(printf '\e[1;31m')" \
        LESS_TERMCAP_md="$(printf '\e[1;31m')" \
        LESS_TERMCAP_me="$(printf '\e[0m')" \
        LESS_TERMCAP_se="$(printf '\e[0m')" \
        LESS_TERMCAP_so="$(printf '\e[1;44;33m')" \
        LESS_TERMCAP_ue="$(printf '\e[0m')" \
        LESS_TERMCAP_us="$(printf '\e[1;32m')" \
        man "$@"
}

# Check if uri is up
isup() {
    local uri=$1

    if curl -s --head  --request GET "$uri" | grep "200 OK" > /dev/null ; then
        terminal-notifier -title '$uri' -message 'is down'
    else
        terminal-notifier -title '$uri' -message 'is up'
    fi
}