命令行字符串检查和参数传递（ImageMagick）

Question

I have this cool little snippet that I found, which adds a shadow to an image. (using imageMagick, i think..)

  image-shadow () {
  out=${1%.*}-shadow.${1#*.}
  in=$1
  echo "Converted file : $out"
  if [ ! -z $2 ] ; then 
    convert $in -frame $2 $out
    in=$out
  fi
  convert $in \( +clone -background black -shadow 60x5+3+3 \) \
    +swap -background transparent -layers merge +repage $out
  }

We use:

image-shadow test.png 0x0

to add 0x0 border, and 3x3 shadow, as defined inside the function...

Now, I have *-hd.png images, and *.png images .. And would like to add 3x3 shadows to the *.png and 6x6 to the *-hd.png (obviously, retina graphics..)

1- How can I compare the the image name, and decide

2- How can I pass the shadow size

Thanks!

Answer 1

For 1.: Use find, it is really the Swiss army knife for such jobs:

find '(' -name '*.png' -and -not -name '*-hd.png' ')' -exec image-shadow '{}' 0x0 ';'

Of course, you'll have to save your function as a single shell file instead of a shell function, but this is desirable for code reuse anyway.

For 2.: Use another command line argument, which is referenced in the function as $3.

Answer 2

for f in *.png; do
  case "$f" in
    *-hd.png) shadow="6x6" ;;
    *) shadow="3x3" ;;
  esac
  image-shadow "$f" $shadow
dona