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add notes for def_env (#5807)

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* add notes for def_env

* Update crates/nu-command/src/core_commands/export_def_env.rs

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>

* Update crates/nu-command/src/core_commands/def_env.rs

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>
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WindSoilder 2022-06-16 19:37:44 +08:00 committed by GitHub
parent 8b0a4ccf4c
commit 8c0d60d0fb
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2 changed files with 54 additions and 2 deletions
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28
crates/nu-command/src/core_commands/def_env.rs
View file

@ -28,7 +28,33 @@ impl Command for DefEnv {
fn extra_usage(&self) -> &str {
r#"This command is a parser keyword. For details, check:
https://www.nushell.sh/book/thinking_in_nushell.html"#
https://www.nushell.sh/book/thinking_in_nushell.html
=== EXTRA NOTE ===
All blocks are scoped, including variable definition and environment variable changes.
Because of this, the following doesn't work:
def-env cd_with_fallback [arg = ""] {
let fall_back_path = "/tmp"
if $arg != "" {
cd $arg
} else {
cd $fall_back_path
}
}
Instead, you have to use cd in the top level scope:
def-env cd_with_fallback [arg = ""] {
let fall_back_path = "/tmp"
let path = if $arg != "" {
$arg
} else {
$fall_back_path
}
cd $path
}"#
}
fn is_parser_keyword(&self) -> bool {

28
crates/nu-command/src/core_commands/export_def_env.rs
View file

@ -28,7 +28,33 @@ impl Command for ExportDefEnv {
fn extra_usage(&self) -> &str {
r#"This command is a parser keyword. For details, check:
https://www.nushell.sh/book/thinking_in_nushell.html"#
https://www.nushell.sh/book/thinking_in_nushell.html
=== EXTRA NOTE ===
All blocks are scoped, including variable definition and environment variable changes.
Because of this, the following doesn't work:
export def-env cd_with_fallback [arg = ""] {
let fall_back_path = "/tmp"
if $arg != "" {
cd $arg
} else {
cd $fall_back_path
}
}
Instead, you have to use cd in the top level scope:
export def-env cd_with_fallback [arg = ""] {
let fall_back_path = "/tmp"
let path = if $arg != "" {
$arg
} else {
$fall_back_path
}
cd $path
}"#
}
fn is_parser_keyword(&self) -> bool {