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function pushd --description 'Push directory to stack'
if count $argv >/dev/null
# check for --help
switch $argv[1]
case -h --h --he --hel --help
__fish_print_help pushd
return 0
end
# emulate bash by checking if argument of form +n or -n
set rot_l (echo $argv[1] | sed -n '/^+\([0-9]\)$/ s//\1/g p')
set rot_r (echo $argv[1] | sed -n '/^-\([0-9]\)$/ s//\1/g p')
end
# emulate bash: an empty pushd should switch the top of dirs
if test (count $argv) -eq 0
# check that the stack isn't empty
if test (count $dirstack) -eq 0
echo "pushd: no other directory"
return 1
end
# get the top two values of the dirs stack ... the first is pwd
set -l top_dir (command pwd)
set -l next_dir $dirstack[1]
# alter the top of dirstack and move to directory
set -g dirstack[1] $top_dir
cd $next_dir
return
end
# emulate bash: check for rotations
if test -n "$rot_l" -o -n "$rot_r"
# grab the current stack
set -l stack (command pwd) $dirstack
# translate a right rotation to a left rotation
if test -n "$rot_r"
# check the rotation in range
if test $rot_r -gt (math (count $stack) - 1)
echo "pushd: -$rot_r: directory stack index out of range"
return 1
end
set rot_l (math (count $stack) - 1 - $rot_r)
end
# check the rotation in range
if test $rot_l -gt (math (count $stack) - 1)
echo "pushd: +$rot_l: directory stack index out of range"
return 1
else
# rotate stack unless rot_l is 0
if test $rot_l -gt 0
set stack $stack[(math $rot_l + 1)..(count $stack)] $stack[1..$rot_l]
end
# now reconstruct dirstack and change directory
set -g dirstack $stack[2..(count $stack)]
cd $stack[1]
end
# print the new stack
dirs
return
end
# Comment to avoid set completions
set -g dirstack (command pwd) $dirstack
cd $argv[1]
end
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