mirror of
https://github.com/helix-editor/helix
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Blaž Hrastnik
3013c107d5
Replaces the tail/all ancestor-sum walk with "indent = number of @indent scopes containing the line". Brace-less bodies use a new `scope "header"` annotation, the dead tail/all scope annotations are removed from the indent queries.
56 lines
2.0 KiB
Scheme
56 lines
2.0 KiB
Scheme
; Indent query for Nix.
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;
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; Nix is an expression language with no statement blocks. Indentation comes from
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; the bracketed scopes ({…} attrsets, […] lists, (…) groups, {…} parameter
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; sets), the `let … in` and `if … then … else` forms, multi-line function
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; application, and the continuation of a binding whose value spills onto a
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; following line.
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; One level per bracketed scope; the matching close token dedents.
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[
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(attrset_expression)
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(rec_attrset_expression)
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(let_attrset_expression)
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(list_expression)
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(parenthesized_expression)
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(formals)
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] @indent
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[
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"}"
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")"
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"]"
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] @outdent
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; A binding value carried onto the line(s) after `=`. It shares the `=` line
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; with a same-line bracket, so `x = { … }` is not indented twice.
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(binding) @indent
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; `let … in`: indent everything inside the `let`, then pull `in` and the body
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; back so only the bindings stay indented. Indenting the whole `let_expression`
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; (rather than its `binding_set`) also gives the right indent when a newline is
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; typed straight after `let`, before any binding exists — the cursor is still
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; inside `let_expression`, whereas the `binding_set` does not yet exist.
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(let_expression) @indent
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(let_expression "in" @outdent)
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(let_expression body: (_) @outdent)
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; `if … then … else`: indent each branch. scope "all" covers a branch written on
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; its own line. An `else if` is skipped — the nested `if` indents its own
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; branches, so the chain stays flat instead of stair-stepping.
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(if_expression
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consequence: (_) @indent
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(#set! "scope" "header"))
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(if_expression
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alternative: (_) @indent
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(#not-kind-eq? @indent "if_expression")
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(#set! "scope" "header"))
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; Function application: arguments carried onto following lines. Nested
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; applications share a line, so they collapse to a single level.
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(apply_expression) @indent
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; Indented strings are literal text (often embedded scripts); preserve their
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; interior verbatim rather than reflowing it as code.
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(indented_string_expression) @opaque
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