rename_screenshots.sh

#!/bin/sh

# Usage:
# ./rename_screenshots.sh -h
#
# Optios:
#   -h Show help
#   -d Directory where screenshots are saved
#   -p Pattern of the files
#   -s Remove spaces from file names
#   -f Run in foreground
#
# Example:
# $ ./rename_screenshots.sh screen_shot &
# $ disown

if ! type fswatch >/dev/null 2>&1; then
    echo 'fswatch not found' 1>&2
    exit 1
fi

DEFAULTS_COMMAND="defaults read com.apple.screencapture"
LOCATION="$( $DEFAULTS_COMMAND location 2>/dev/null || echo "$HOME/Desktop" )"
DEFAULT_NAME="$( $DEFAULTS_COMMAND name 2>/dev/null || echo "Screen Shot" )"
EXT="$( $DEFAULTS_COMMAND type 2>/dev/null || echo "png" )"
PATTERN="^$DEFAULT_NAME.*\.$EXT$"
ONLY_REMOVE_SPACES=0
# In case of duplicates
SUFFIX=1
RUN_IN_FOREGROUND=0
VERBOSE=0

while getopts 'hp:d:sfv' flag; do
    case "$flag" in
        p)
            PATTERN="$OPTARG"
            ;;
        d)
            LOCATION="$OPTARG"
            ;;
        s)
            ONLY_REMOVE_SPACES=1
            ;;
        f)
            RUN_IN_FOREGROUND=1
            ;;
        v)
            VERBOSE=1
            ;;
        h)
            echo "Usage: $0 [-h] [-p <regex>] [-d <dir to monitor>] " \
                "[-s] [name]"
            exit 0
    esac

done
shift $(( $OPTIND - 1 ))

NAME="${1:-"ss"}"

__monitor_screenshots() {
    fswatch -0 "$LOCATION" | while read -d $'\0' full_path; do
        BASENAME="$( basename "$full_path" )"
        DIRNAME="$( dirname "$full_path" )"

        if [ -n "$( echo "$BASENAME" | grep -o "$PATTERN" )" ] && [ -f "$full_path" ]; then
            if [ "$ONLY_REMOVE_SPACES" -eq 1 ]; then
                mv "$full_path" "$DIRNAME/$( echo "$BASENAME" | sed -e 's/ //g' )"
            else
                # First try without prefix
                NEW_NAME="$NAME.$EXT"
                while [ -f "$DIRNAME/$NEW_NAME" ]; do
                    NEW_NAME="$NAME$SUFFIX.$EXT"
                    SUFFIX="$( echo "$SUFFIX + 1" | bc)"
                done

                mv "$full_path" "$DIRNAME/$NEW_NAME"

                if [ "$VERBOSE" -eq 1 ]; then
                    echo "$full_path"
                    echo "  => $NEW_NAME"
                fi
            fi
        fi
    done
}


if [ "$RUN_IN_FOREGROUND" -eq 1 ]; then
    __monitor_screenshots
else
    __monitor_screenshots &
fi