Initialize with rules, test data and license from nix-gitignore

tests/testdata.nix

@@ -0,0 +1,88 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+/*
+  Programmatically specifies the test data.
+ */
+let
+  inherit (pkgs) runCommand;
+
+  createTree = ''
+    touches() { (
+        mkdir -p "$1"; cd "$1"; shift
+        touch "$@"
+    ); }
+
+    create-tree() { (
+        mkdir -p "$1"; cd "$1"
+
+        touches 1-simpl          {1,2,3,4,5,^,$,^$,$^,[,[[,],]],]]],ab,bb,\\,\\\\,simple-test}
+        touches 1-simpl/1-simpl  {1,2,3,4,5,^,$,^$,$^,[,[[,],]],]]],ab,bb,\\,\\\\,simpletest}
+        touches 1-xxxxx/1-simpl  {1,2}
+        touch {,1-simpl/}char-class-pathalogic
+
+        touches 2-negation       {.keep,10,20,30,40,50,60,70}
+
+        touches 3-wildcards      {foo,bar,bbar,baz}.html
+        touches 3-wildcards/html {foo,bar,bbar,baz}.html
+
+        touches 4-escapes        {{*,o{,_,__,?,}ther}.html,other.html{,\$,\$\$}}
+
+        touches 5-directory      {1,2,3,4,5,^,$,^$,$^,[,[[,],]],]]],ab,bb,\\,\\\\}
+
+        touches 9-expected       {unfiltered,filtered-via-aux-{filter,ignore,filepath}}
+    ); }
+
+    create-tree "$1"
+
+    cat ${builtins.toFile "nixgitignore-ignores" ignores} > "$1/.gitignore"
+    cat ${builtins.toFile "nixgitignore-ignores" ignoresAux} > "$1/aux.gitignore"
+  '';
+
+  createTreeRecursive = createTree + "\n" + ''
+    cp -r "$1" "$1" 2>&1 | grep -vq 'cannot copy a directory, .*into itself' || :
+  '';
+
+  ignores = ''
+    1-simpl/1
+    /1-simpl/2
+    /1-simpl/[35^$[]]
+    /1-simpl/][\]]
+    /1-simpl/[^a]b
+    /1-simpl/[\\]
+    simple*test
+
+    # [^b/]har-class-pathalogic
+    # this fails, but is pathalogic, so I won't cover it
+
+    2-*/[^.]*
+    !2-*/1?
+    !2-*/30
+    !/2-*/70
+    !/40
+    !50
+
+    3-*/*foo.html
+    3-*/**/bar.html
+
+    4-*/\*.html
+    4-*/o??ther.html
+    4-*/o\?ther.html
+    4-*/other.html$
+
+    5-*/
+  '';
+
+  ignoresAux = "/9-expected/*filepath\n";
+
+  createSourceTree = createTree: (runCommand "test-tree" {} ''
+    mkdir -p $out; cd $out;
+    bash ${builtins.toFile "create-tree" createTree} test-tree
+   '');
+
+  # source is a copy of sourceUnfiltered, which lives in the nix store
+  sourceUnfiltered = createSourceTree createTree;
+  sourceUnfilteredRecursive = createSourceTree createTreeRecursive;
+
+in {
+  inherit sourceUnfiltered sourceUnfilteredRecursive;
+}