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[Backport release-0.8] docs(api): pattern is not expanded for autocommands (#20838)
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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@ -3265,6 +3265,12 @@ nvim_create_autocmd({event}, {*opts}) *nvim_create_autocmd()*
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pattern = { "*.py", "*.pyi" }
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<
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Note: The `pattern` is passed to callbacks and commands as a literal string; environment
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variables like `$HOME` and `~` are not automatically expanded as they are by |:autocmd|. Instead,
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|expand()| such variables explicitly: >
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pattern = vim.fn.expand("~") .. "/some/path/*.py"
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<
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Example values for event: >
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"BufWritePre"
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{"CursorHold", "BufWritePre", "BufWritePost"}
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@ -3277,7 +3283,7 @@ nvim_create_autocmd({event}, {*opts}) *nvim_create_autocmd()*
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• group (string|integer) optional: the autocommand group name
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or id to match against.
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• pattern (string|array) optional: pattern or patterns to
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match against |autocmd-pattern|.
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match literally against |autocmd-pattern|.
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• buffer (integer) optional: buffer number for buffer local
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autocommands |autocmd-buflocal|. Cannot be used with
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{pattern}.
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@ -401,6 +401,13 @@ cleanup:
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/// pattern = { "*.py", "*.pyi" }
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/// </pre>
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///
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/// Note: The `pattern` is passed to callbacks and commands as a literal string; environment
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/// variables like `$HOME` and `~` are not automatically expanded as they are by |:autocmd|.
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/// Instead, |expand()| such variables explicitly:
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/// <pre>
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/// pattern = vim.fn.expand("~") .. "/some/path/*.py"
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/// </pre>
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///
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/// Example values for event:
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/// <pre>
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/// "BufWritePre"
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@ -411,7 +418,7 @@ cleanup:
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/// @param opts Dictionary of autocommand options:
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/// - group (string|integer) optional: the autocommand group name or
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/// id to match against.
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/// - pattern (string|array) optional: pattern or patterns to match
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/// - pattern (string|array) optional: pattern or patterns to match literally
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/// against |autocmd-pattern|.
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/// - buffer (integer) optional: buffer number for buffer local autocommands
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/// |autocmd-buflocal|. Cannot be used with {pattern}.
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