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https://github.com/fish-shell/fish-shell.git
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f07d59c55d
The following behaviour is added: - an empty pushd exchanges the top two directories in the stack; - pushd +<n> rotates the stack so that the n-th directory (counting from the left of the list shown by dirs, starting with zero) is at the top; - pushd -<n> rotates the stack so that the nth directory (counting from the right of the list shown by dirs, starting with zero) is at the top.
76 lines
1.8 KiB
Fish
76 lines
1.8 KiB
Fish
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function pushd --description 'Push directory to stack'
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if count $argv >/dev/null
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# check for --help
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switch $argv[1]
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case -h --h --he --hel --help
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__fish_print_help pushd
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return 0
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end
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# emulate bash by checking if argument of form +n or -n
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set rot_l (echo $argv[1] | sed -n '/^+\([0-9]\)$/ s//\1/g p')
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set rot_r (echo $argv[1] | sed -n '/^-\([0-9]\)$/ s//\1/g p')
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end
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# emulate bash: an empty pushd should switch the top of dirs
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if test (count $argv) -eq 0
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# check that the stack isn't empty
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if test (count $dirstack) -eq 0
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echo "pushd: no other directory"
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return 1
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end
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# get the top two values of the dirs stack ... the first is pwd
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set -l top_dir (command pwd)
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set -l next_dir $dirstack[1]
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# alter the top of dirstack and move to directory
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set -g dirstack[1] $top_dir
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cd $next_dir
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return
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end
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# emulate bash: check for rotations
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if test -n "$rot_l" -o -n "$rot_r"
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# grab the current stack
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set -l stack (command pwd) $dirstack
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# translate a right rotation to a left rotation
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if test -n "$rot_r"
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# check the rotation in range
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if test $rot_r -gt (math (count $stack) - 1)
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echo "pushd: -$rot_r: directory stack index out of range"
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return 1
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end
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set rot_l (math (count $stack) - 1 - $rot_r)
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end
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# check the rotation in range
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if test $rot_l -gt (math (count $stack) - 1)
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echo "pushd: +$rot_l: directory stack index out of range"
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return 1
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else
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# rotate stack unless rot_l is 0
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if test $rot_l -gt 0
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set stack $stack[(math $rot_l + 1)..(count $stack)] $stack[1..$rot_l]
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end
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# now reconstruct dirstack and change directory
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set -g dirstack $stack[2..(count $stack)]
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cd $stack[1]
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end
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# print the new stack
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dirs
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return
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end
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# Comment to avoid set completions
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set -g dirstack (command pwd) $dirstack
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cd $argv[1]
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end
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