Allow handling subtitles with no season markings, add no-season option to allow this.

subtitles-renamer.sh

#!/usr/bin/env bash

# Renames subtitles files according to tv shows names found in a directory and its subdirectories RECURSIVELY
# Acceped syntaxes for season/episode are: 304, s3e04, s03e04, 3x04, Season 03 Episode 04  (case insensitive)
#
# Usage:
# Put this gist somewhere in your $PATH, like /usr/local/bin/subtitles-renamer
# Chmod +x it
# cd ~/YourHolidaysTvShowsWithSubtitles
# subtitles-renamer
# or if there are no season numbers in the subtitles use below
# subtitles-renamer no-season
# (it is still ok if the movie files have season strings)
#
# Note: zipfiles will be unzipped but .zip will not be removed (can edit to make it so)
#
# There are bashisms to work with regular expressions,
# so you really need bash or a shell compatible



mode="${1:-season}"
if [[ "$mode" != "season" && "$mode" != "no-season" ]]; then
    echo "Wrong mode parameter $mode given";
    echo "use 'subtitles-renamer' or 'subtitles-renamer <mode>' where mode can be 'season' or 'no-season' (defaults to season)"
    exit 1;
fi

# switch into case insensitive
shopt -s nocasematch
shopt -s extglob

do_renaming () {
    # unzip files, maybe there are subtitles in it...
    for f in *.zip; do
        if [ -e "$f" ]; then
            unzip "$f"
            # rm "$f"
        fi
    done
    # search subtitles
    for f in *.{srt,ssa,sub,ass,idx} ; do
        if [ -e "$f" ]; then
            fOrg="$f"
            f="${fOrg//@(240|360|480|720|1080)p}";
            #    echo "original $fOrg to $f"
            
            if [[ "$mode" == "season" ]]; then
                if [[ "$f" =~ s([0-9]+)e([0-9]+) || "$f" =~ ([0-9]+)x([0-9]+) || "$f" =~ ([0-9]+)([0-9][0-9]) ]]; then
                    echo "Found '$fOrg'"
                    let SEASON="10#${BASH_REMATCH[1]}" # eventually delete leading 0
                    EPISODE=${BASH_REMATCH[2]}
                    echo "SEASON $SEASON EPISODE $EPISODE"
                    
                    # search for a matching film
                    for movie in *.{avi,mkv,mp4} ; do
                        if [ -e "$movie" ]; then
                            mOrg="$movie"
                            movie="${mOrg//@(240|360|480|720|1080)p}";
                            if [[ "$movie" =~ ${SEASON}${EPISODE} || "$movie" =~ s0?${SEASON}e${EPISODE} || "$movie" =~ ${SEASON}x${EPISODE} || "$movie" =~ (Season 0?${SEASON} Episode ${EPISODE}) ]]; then
                                
                                NEW_NAME=`echo "${mOrg%.*}.${fOrg##*.}"`
                                if [ "$fOrg" = "${NEW_NAME}" ]; then
                                    echo "  Already ok"
                                    elif [ -e "${NEW_NAME}" ]; then
                                    echo "  A file named '${NEW_NAME}' already exist, skipping"
                                else
                                    mv "$fOrg" "${NEW_NAME}"
                                    echo "  Renamed '$fOrg' in '${NEW_NAME}'"
                                fi
                                break;
                            fi
                        fi
                    done
                fi
                elif  [[ "$mode" == "no-season" ]]; then
                if [[ "$f" =~ ([0-9]+) ]]; then
                    echo "Found '$fOrg'"
                    let EPISODE="10#${BASH_REMATCH[1]}" # eventually delete leading 0
                    echo "SEASON no-season EPISODE $EPISODE"
                    
                    # search for a matching film
                    for movie in *.{avi,mkv,mp4} ; do
                        if [ -e "$movie" ]; then
                            mOrg="$movie"
                            movie="${mOrg//@(240|360|480|720|1080)p}";
                            echo "check episode $EPISODE with movie $movie"
                            if [[ "$movie" =~ (Episode ${EPISODE}) || "$movie" =~ e([0]*)${EPISODE}[^0-9] || "$movie" =~ x([0]*)${EPISODE}[^0-9] || "$movie" =~ [^0-9]([0]*)${EPISODE}[^0-9] ]]; then
                                
                                NEW_NAME=`echo "${mOrg%.*}.${fOrg##*.}"`
                                if [ "$fOrg" = "${NEW_NAME}" ]; then
                                    echo "  Already ok"
                                    elif [ -e "${NEW_NAME}" ]; then
                                    echo "  A file named '${NEW_NAME}' already exist, skipping"
                                else
                                    mv "$fOrg" "${NEW_NAME}"
                                    echo "  Renamed '$fOrg' in '${NEW_NAME}'"
                                fi
                                break;
                            fi
                        fi
                    done
                fi
            fi
        fi
    done
}

recurse() {
    for i in "$1"/*;do
        if [ -d "$i" ];then
            echo "dir: $i"
            pushd "$i"
            do_renaming
            popd
            recurse "$i"
            elif [ -f "$i" ]; then
            echo "file: $i"
        fi
    done
}

recurse .
# reswitch into case sensitive
shopt -u nocasematch
shopt -u extglob

exit 0