51 lines
2.5 KiB
Nix
51 lines
2.5 KiB
Nix
# if evaluating outside of the store, copy the current directory to the store and import it
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# filtering out .gitignore files and .git directories
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# if evaluating inside the store, import the outputs.nix file
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let
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contains = str: substr: let
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str_length = builtins.stringLength str;
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substr_length = builtins.stringLength substr;
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listOfPossibleSubstrings = builtins.genList (i: builtins.substring i substr_length str) (str_length - substr_length + 1);
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in if substr_length > str_length then false else builtins.any (x: x == substr) listOfPossibleSubstrings;
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endsWith = str: substr: let
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str_length = builtins.stringLength str;
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substr_length = builtins.stringLength substr;
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in if substr_length > str_length then false else builtins.substring (str_length - substr_length) str_length str == substr;
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gitignore = builtins.filter (v:
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# ignore comments and empty lines
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if !(builtins.isString v) then false
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else if !builtins.isNull(builtins.match "^#.*" v) then false
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else if !builtins.isNull(builtins.match "^$" v) then false
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else true
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) (builtins.split "\n" (builtins.readFile ./.gitignore));
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# checks if a given path matches a gitignore pattern
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# string -> bool
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matchesGitIgnore = path: builtins.any (pattern:
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let
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patternLength = builtins.stringLength pattern;
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unsupportedPatternMessage = "matchesGitIgnore: Unsupported pattern: ${pattern}";
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in
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if pattern == "*" then true
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else if pattern == ".*" then true
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else if pattern == "*.*" then true
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else if builtins.substring 0 2 pattern == "*." then endsWith path (builtins.substring 0 2 pattern)
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else if contains pattern "*" then abort unsupportedPatternMessage
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else if patternLength > 2 && builtins.substring 0 2 pattern == "./" then abort unsupportedPatternMessage
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else if patternLength > 1 && builtins.substring 0 1 pattern == "/" then abort unsupportedPatternMessage
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else contains path pattern
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) gitignore;
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currentFilePath = (builtins.unsafeGetAttrPos "any" { any = "any"; }).file;
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storePathLength = builtins.stringLength (builtins.toString builtins.storeDir);
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evaluatingInStore = (builtins.substring 0 storePathLength currentFilePath) == builtins.storeDir;
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selfInStore = builtins.filterSource (path: type:
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type != "unknown" && builtins.baseNameOf path != ".git" && !matchesGitIgnore path
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) ./.;
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in
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if !(evaluatingInStore) then { ... }@args: import selfInStore ({ selfPath = selfInStore; } // args )
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else { ... }@args: import ./outputs.nix ({ selfPath = selfInStore; } // args)
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