dotfiles/scripts/prefix/bin/mvln

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2016-03-18 17:59:50 +01:00
#!/bin/bash
# Moves and links a file back at its initial location
# It can not cross filesystems!
#
# Usage: mvln PATH1 PATH2
# Depends on: realpath, basename, dirname
if [[ $# -ne 2 ]]
then
echo "Usage: mvln <PATH1> <PATH2>"
exit 0
fi
# Step 1: building full path out of both arguments #############################
[[ $1 =~ ^/ ]] && F1=$1 || F1=$(realpath -s $1)
[[ $2 =~ ^/ ]] && F2=$2 || F2=$(realpath -s $2)
# Step 2: enumerating all interesting cases ####################################
# PATH1 can be:
if [[ -f $F1 ]]
then STATE1="0" # a regular file
elif [[ -d $PWD/$F1 ]]
then STATE1="1" # a directory
elif [[ -e $F1 ]]
then STATE1="8" # an other kind of file
else STATE1="9" # a non-existent file
fi
# PATH2 can be:
if [[ -d $F2 ]]
then STATE2="0" # a directory
elif [[ -d $(dirname $F2) ]]
then STATE2="1" # a non-existent file in an existent directory
elif [[ -e $F2 ]]
then STATE2="8" # any other kind of file
else STATE2="9" # a non-existent file in a non-existent directory
fi
# Step 3: eat this my little state automaton ###################################
STATE="$STATE1$STATE2"
case $STATE in
[89]* )
>&2 echo "$F1 is not a proper file (or a non-existent one)"
>&2 echo "Note that only regular files and directories are allowed"
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exit $STATE
;;
*[89] )
>&2 echo "$F2 can not be created (containing directory does not exist)"
>&2 echo "or exists already (refusing to overwrite)"
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exit $STATE
;;
[01]0 ) # file or dir to an existing dir
DEGUB="File/Dir to same name in existing dir"
PATH1=$F1
PATH2=$F2/$(basename $F1)
;;
[01]1 ) # file to new file name in an existing dir
DEGUB="File/Dir to new name in existing dir"
PATH1=$F1
PATH2=$F2
;;
* )
echo "Uncaught error (this is f*****g bad)"
exit $STATE
;;
esac
#echo $DEGUB
# Step 4: eventually act upon gathered knowledge ###############################
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mv $PATH1 $PATH2 # Works across filesystems (fast enough!)
ln -s $PATH2 $PATH1 # Soft link back to old location