# virtualenv activation module
# Activate with `overlay use activate.nu`
# Deactivate with `deactivate`, as usual
#
# To customize the overlay name, you can call `overlay use activate.nu as foo`,
# but then simply `deactivate` won't work because it is just an alias to hide
# the "activate" overlay. You'd need to call `overlay hide foo` manually.
export-env {
def is-string [x] {
($x | describe) == 'string'
}
def has-env [name: string] {
$name in $env
}
# Emulates a `test -z`, but btter as it handles e.g 'false'
def is-env-true [name: string] {
if (has-env $name) {
# Try to parse 'true', '0', '1', and fail if not convertible
let parsed = (do -i { $env | get $name | into bool })
if ($parsed | describe) == 'bool' {
$parsed
} else {
not ($env | get $name | is-empty)
}
} else {
false
}
}
let is_windows = ($nu.os-info.name | str downcase) == 'windows'
let virtual_env = '__VIRTUAL_ENV__'
let bin = '__BIN_NAME__'
let path_sep = (char esep)
let path_name = (if $is_windows {
if (has-env 'Path') {
'Path'
} else {
'PATH'
}
} else {
'PATH'
})
let old_path = (
if $is_windows {
if (has-env 'Path') {
$env.Path
} else {
$env.PATH
}
} else {
$env.PATH
} | if (is-string $in) {
# if Path/PATH is a string, make it a list
$in | split row $path_sep | path expand
} else {
$in
}
)
let venv_path = ([$virtual_env $bin] | path join)
let new_path = ($old_path | prepend $venv_path | str join $path_sep)
let new_env = {
$path_name : $new_path
VIRTUAL_ENV : $virtual_env
}
let new_env = (if (is-env-true 'VIRTUAL_ENV_DISABLE_PROMPT') {
$new_env
} else {
# Creating the new prompt for the session
let virtual_prompt = (if ('__VIRTUAL_PROMPT__' == '') {
$'(char lparen)($virtual_env | path basename)(char rparen) '
} else {
'(__VIRTUAL_PROMPT__) '
})
# Back up the old prompt builder
let old_prompt_command = (if (has-env 'VIRTUAL_ENV') and (has-env '_OLD_PROMPT_COMMAND') {
$env._OLD_PROMPT_COMMAND
} else {
if (has-env 'PROMPT_COMMAND') {
$env.PROMPT_COMMAND
} else {
''
}
})
# If there is no default prompt, then only the env is printed in the prompt
let new_prompt = (if (has-env 'PROMPT_COMMAND') {
if 'closure' in ($old_prompt_command | describe) {
{|| $'($virtual_prompt)(do $old_prompt_command)' }
} else {
{|| $'($virtual_prompt)($old_prompt_command)' }
}
} else {
{|| $'($virtual_prompt)' }
})
$new_env | merge {
_OLD_VIRTUAL_PATH : ($old_path | str join $path_sep)
_OLD_PROMPT_COMMAND : $old_prompt_command
PROMPT_COMMAND : $new_prompt
VIRTUAL_PROMPT : $virtual_prompt
}
})
# Environment variables that will be loaded as the virtual env
load-env $new_env
}
export alias pydoc = python -m pydoc
export alias deactivate = overlay hide activate
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