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Detect the last screenshot on the desktop according to a pattern; scale with ImageMagick
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| #!/usr/bin/env bash | |
| ## | |
| ## scale the last screenshot on the desktop with ImageMagick | |
| ## | |
| ## Author: Kevin Ernst (ernstki -at- mail.uc.edu) | |
| ## Date: 25 October 2020 | |
| ## Source: https://gist.github.com/ernstki/8776b3325f0a7abcc0d6080b2160a15c | |
| ## License: MIT (https://choosealicense.com/licenses/mit) | |
| ## | |
| ## Installation: | |
| ## | |
| ## $ GIST=https://gist.githubusercontent.com/ernstki/8776b3325f0a7abcc0d6080b2160a15c/raw/scale.sh | |
| ## $ (curl -L $GIST || wget -O - $GIST) > ~/bin/scale | |
| ## $ (cd ~/bin; chmod a+x scale; ln -s scale scalelast) | |
| ## $ scale # see if it works | |
| ## | |
| #set -u # fail on uninitialized variables | |
| # All of the defaults below can be customized w/ environment variables in your | |
| # ~/.bashrc if your setup is different. What's below is default for the English | |
| # language macOS, but "Screen Shot" is "Bildschirmfoto" for the German | |
| # localization, for example. | |
| # on Mac, default is ~/Desktop, but can be changed with a 'defaults write' | |
| DEFAULT_DIR=${SCALE_SCREENSHOT_DIR:-$HOME/Desktop} | |
| # this is the Mac default; might be localized for you | |
| DEFAULT_PREFIX=${SCALE_SCREENSHOT_PREFIX:-Screen Shot} | |
| # default is PNG on Mac; can be customized with a 'defaults write' | |
| DEFAULT_EXT=${SCALE_SCREENSHOT_EXT:-png} | |
| # default to '800x' (max 800 px horiz.) unless otherwise specified | |
| DEFAULT_GEOM=${SCALE_SCREENSHOT_GEOM:-800x} | |
| # scale image $2 using 'convert -geometry $1' | |
| # see https://imagemagick.org/script/command-line-processing.php#geometry | |
| _scale() { | |
| local geom=${1:?Expected geometry (e.g. '800x', '75%') as first parameter} | |
| local file=${2:?Expected image filename as second parameter} | |
| local base=${file%.*} # strip (shortest) extension | |
| local ext=${file##*.} # strip up to and including last '.' | |
| local suff='_scaled' # suffix to add to scaled image | |
| if [[ ! -f $file ]]; then | |
| echo "ERROR: file '$file' doesn't exist." >&2; return 1; | |
| fi | |
| # run in a subshell w/ trace enabled so you see the command that will run | |
| ( set -x; convert -geometry "$geom" "$base.$ext" "$base$suff.$ext" ) | |
| } | |
| # return filename of last screenshot in ~/Desktop (without a suffix) | |
| _lastshot() { | |
| local where=$DEFAULT_DIR | |
| local prefix=$DEFAULT_PREFIX | |
| local ext=$DEFAULT_EXT | |
| local newest= | |
| for shot in "$where/$prefix"*[0-9][0-9].$ext; do | |
| # '-nt' means "newer than" | |
| [[ -f $shot ]] && [[ $shot -nt $newest ]] && newest=$shot | |
| done | |
| echo "$newest" | |
| } | |
| # scale the last screenshot in ~/Desktop (without a '_scaled' suffix) | |
| _scalelast() { | |
| local lastshot=$(_lastshot) | |
| local defaultgeom=$DEFAULT_GEOM | |
| _scale "${1:-$defaultgeom}" "${lastshot:?No screenshots found.}" | |
| } | |
| # detect if being sourced and 'export'; otherwise execute internal functions | |
| # based on the name of the script | |
| # h/t: https://github.com/bpkg/term/blob/master/term.sh#L286 | |
| if [[ ${BASH_SOURCE[0]} != $0 ]]; then | |
| export -f _scale _lastshot _scalelast | |
| else | |
| # look at the basename of the script and run that function; for example, if | |
| # you symlink it as 'lastshot', runs '_lastshot' with given arguments | |
| _${0##*/} "$@" | |
| fi |
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