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Add locateDominatingFile lib function
(cherry picked from commit 56e71f6)
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{ # locateDominatingFile : RegExp | ||
# -> Path | ||
# -> Nullable { path : Path; | ||
# matches : [ MatchResults ]; | ||
# } | ||
# Find the first directory containing a file matching 'pattern' | ||
# upward from a given 'file'. | ||
# Returns 'null' if no directories contain a file matching 'pattern'. | ||
locateDominatingFile = pattern: file: | ||
let go = path: | ||
let files = builtins.attrNames (builtins.readDir path); | ||
matches = builtins.filter (match: match != null) | ||
(map (builtins.match pattern) files); | ||
in | ||
if builtins.length matches != 0 | ||
then { inherit path matches; } | ||
else if path == /. | ||
then null | ||
else go (dirOf path); | ||
parent = dirOf file; | ||
isDir = | ||
let base = baseNameOf file; | ||
type = (builtins.readDir parent).${base} or null; | ||
in file == /. || type == "directory"; | ||
in go (if isDir then file else parent); | ||
} |