nushell/crates/nu-std/lib/dirs.nu

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# Maintain a list of working directories and navigates them
# the directory stack
export-env {
let-env DIRS_POSITION = 0
let-env DIRS_LIST = [($env.PWD | path expand)]
}
# Add one or more directories to the list.
# PWD becomes first of the newly added directories.
export def-env "dirs add" [
...paths: string # directory or directories to add to working list
] {
mut abspaths = []
for p in $paths {
let exp = ($p | path expand)
if ($exp | path type) != 'dir' {
let span = (metadata $p).span
error make {msg: "not a directory", label: {text: "not a directory", start: $span.start, end: $span.end } }
}
$abspaths = ($abspaths | append $exp)
}
let-env DIRS_LIST = ($env.DIRS_LIST | insert ($env.DIRS_POSITION + 1) $abspaths | flatten)
let-env DIRS_POSITION = $env.DIRS_POSITION + 1
_fetch 0
}
# Advance to the next directory in the list or wrap to beginning.
export def-env "dirs next" [
N:int = 1 # number of positions to move.
] {
_fetch $N
}
# Back up to the previous directory or wrap to the end.
export def-env "dirs prev" [
N:int = 1 # number of positions to move.
] {
_fetch (-1 * $N)
}
# Drop the current directory from the list, if it's not the only one.
# PWD becomes the next working directory
export def-env "dirs drop" [] {
if ($env.DIRS_LIST | length) > 1 {
let-env DIRS_LIST = (
($env.DIRS_LIST | take $env.DIRS_POSITION)
| append ($env.DIRS_LIST | skip ($env.DIRS_POSITION + 1))
)
}
_fetch 0
}
# Display current working directories.
export def-env "dirs show" [] {
mut out = []
for $p in ($env.DIRS_LIST | enumerate) {
$out = ($out | append [
[active, path];
[($p.index == $env.DIRS_POSITION), $p.item]
])
}
$out
}
# fetch item helper
def-env _fetch [
offset: int, # signed change to position
] {
# nushell 'mod' operator is really 'remainder', can return negative values.
# see: https://stackoverflow.com/questions/13683563/whats-the-difference-between-mod-and-remainder
let pos = ($env.DIRS_POSITION
+ $offset
+ ($env.DIRS_LIST | length)
) mod ($env.DIRS_LIST | length)
let-env DIRS_POSITION = $pos
cd ($env.DIRS_LIST | get $pos )
}