27 lines
1.1 KiB
Nix
27 lines
1.1 KiB
Nix
{ # locateDominatingFile : RegExp
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# -> Path
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# -> Nullable { path : Path;
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# matches : [ MatchResults ];
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# }
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# Find the first directory containing a file matching 'pattern'
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# upward from a given 'file'.
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# Returns 'null' if no directories contain a file matching 'pattern'.
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locateDominatingFile = pattern: file:
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let go = path:
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let files = builtins.attrNames (builtins.readDir path);
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matches = builtins.filter (match: match != null)
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(map (builtins.match pattern) files);
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in
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if builtins.length matches != 0
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then { inherit path matches; }
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else if path == /.
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then null
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else go (dirOf path);
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parent = dirOf file;
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isDir =
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let base = baseNameOf file;
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type = (builtins.readDir parent).${base} or null;
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in file == /. || type == "directory";
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in go (if isDir then file else parent);
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}
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