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[Backport release-0.8] docs(api): pattern is not expanded for autocommands (#20838)

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docs(api): pattern is not expanded for autocommands

Problem: Unlike `:autocmd`, `nvim_create_autocommand()` does not expand
environment variables in the `pattern`, which is unexpected.

Solution: Add a note to the documentation explaining this and suggesting
using `expand()` explicitly.

(cherry picked from commit eeaf943ca3)

Co-authored-by: Christian Clason <c.clason@uni-graz.at>
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github-actions[bot] 2022-10-27 18:59:25 -07:00 committed by GitHub
parent ddc0b75d53
commit 5eab16fa24
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2 changed files with 15 additions and 2 deletions
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8
runtime/doc/api.txt
View File

@ -3265,6 +3265,12 @@ nvim_create_autocmd({event}, {*opts}) *nvim_create_autocmd()*
pattern = { "*.py", "*.pyi" }
<
Note: The `pattern` is passed to callbacks and commands as a literal string; environment
variables like `$HOME` and `~` are not automatically expanded as they are by |:autocmd|. Instead,
|expand()| such variables explicitly: >
pattern = vim.fn.expand("~") .. "/some/path/*.py"
<
Example values for event: >
"BufWritePre"
{"CursorHold", "BufWritePre", "BufWritePost"}
@ -3277,7 +3283,7 @@ nvim_create_autocmd({event}, {*opts}) *nvim_create_autocmd()*
• group (string|integer) optional: the autocommand group name
or id to match against.
• pattern (string|array) optional: pattern or patterns to
match against |autocmd-pattern|.
match literally against |autocmd-pattern|.
• buffer (integer) optional: buffer number for buffer local
autocommands |autocmd-buflocal|. Cannot be used with
{pattern}.

9
src/nvim/api/autocmd.c
View File

@ -401,6 +401,13 @@ cleanup:
/// pattern = { "*.py", "*.pyi" }
/// </pre>
///
/// Note: The `pattern` is passed to callbacks and commands as a literal string; environment
/// variables like `$HOME` and `~` are not automatically expanded as they are by |:autocmd|.
/// Instead, |expand()| such variables explicitly:
/// <pre>
/// pattern = vim.fn.expand("~") .. "/some/path/*.py"
/// </pre>
///
/// Example values for event:
/// <pre>
/// "BufWritePre"
@ -411,7 +418,7 @@ cleanup:
/// @param opts Dictionary of autocommand options:
/// - group (string|integer) optional: the autocommand group name or
/// id to match against.
/// - pattern (string|array) optional: pattern or patterns to match
/// - pattern (string|array) optional: pattern or patterns to match literally
/// against |autocmd-pattern|.
/// - buffer (integer) optional: buffer number for buffer local autocommands
/// |autocmd-buflocal|. Cannot be used with {pattern}.