exif batch editing.fish

# write date created to date modified
## `GetFileInfo -d $file` gives us 01/28/2007 22:56:00
# we need "YYYYMMDDhhmm" for `touch -mt` to set modification time
set tally 0
for file in (find ./ -maxdepth 1)
    set dateString "" # final result goes here
    set cuts "7-10" "1-2" "4-5" "12-13" "15-16" # string indices to extract
    for cut in $cuts
        set dateString $dateString(GetFileInfo -d $file | cut -c $cut)
    end
    touch -mt$dateString $file # update mod date
    set tally (math $tally + 1) # deceminate sitrep
    echo "Modified "$tally" files..."
end

# replace file system modified date with exif CreationDate
## `exiftool` doesn't write to wmv's, so without MediaCreateDate Google Photos uses 
## file system's modified date, which is wrong. 
for file in ./*.wmv
    set dateString (exiftool -s -s -s -creationdate $file | sed "s/://g" | sed "s/\ //g" | sed "s/Z//g")
    set dateString (echo $dateString | cut -c 1-12)
    touch -mt$dateString $file
    echo $file" modified date is now "$dateString
end

# replace file system modified date with exif media create date
for file in ./*.3gp
    set dateString (exiftool -s -s -s -mediacreatedate $file | sed "s/://g" | sed "s/\ //g" | sed "s/Z//g")
    set dateString (echo $dateString | cut -c 1-12)
    touch -mt$dateString $file
    echo $file" modified date is now "$dateString
end