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