mycdrip: Add -w and -f options to split actions

Add options to separate extraction and conversion, in case you have to
extract on a specific computer (with a CD drive that is able to read
your CD!), but would rather convert on the other computer (with a more
recent version of flac package for example).

Option -w will only extract to .wav files.
Option -f will only convert .wav files to .flac files (and rename
them).
Signed-off-by: Cédric Marie <cedric@hjuvi.lautre.net>

scripts/mycdrip

@@ -21,6 +21,9 @@ print_usage()
     printf "Prefix the filenames with DISCNUMBER if set.\n\n"
     printf "Options:\n"
     printf "  -h  display this message\n"
+    printf "  -w  only extract .wav files (step 1)\n"
+    printf "  -f  only convert .wav files to .flac (steps 2 and 3)\n"
+    printf "      (Options w and f are mutually exclusive)\n"
 }
 
 print_header()
@@ -28,18 +31,28 @@ print_header()
     printf "\n\033[1;32m$1\033[0m\n"
 }
 
+option_wav=0
+option_flac=0
 # Get options from command line
-while getopts h OPT
+while getopts hwf OPT
 do
     case $OPT in
         h) print_usage; exit 0;;
+        w) option_wav=1;;
+        f) option_flac=1;;
         *) print_usage; exit 1;;
     esac
 done
 shift $(($OPTIND - 1))
 
-print_header "Step 1: Extract to .wav files"
-cdparanoia --batch --never-skip
+[ $option_wav -eq 1 -a $option_flac -eq 1 ] && print_usage && exit 1
+
+if [ $option_flac -eq 0 ]; then
+    print_header "Step 1: Extract to .wav files"
+    cdparanoia --batch --never-skip
+fi
+
+[ $option_wav -eq 1 ] && exit 0
 
 print_header "Step 2: Convert to .flac files"
 flac --delete-input-file --no-seektable *.wav