zaphyra's git: haumea

matchers.extension: init

diff --git a/default.nix b/default.nix
@@ -10,7 +10,9 @@ let
         };
       };
       matchers.nix = import ./src/matchers/nix.nix {
-        inherit lib;
+        super.extension = import ./src/matchers/extension.nix {
+          inherit lib;
+        };
       };
       parsePath = import ./src/__parsePath.nix {
         inherit lib;

diff --git a/docs/src/api/matchers.md b/docs/src/api/matchers.md
@@ -32,13 +32,24 @@ Type: `({ self, super, root, ... } -> Path -> a }) -> Matcher`
 
 Matches any file name. This can be used as the last matcher as a catch-all.
 
+## `matchers.extension`
+
+Source: [`src/matchers/extension.nix`](https://github.com/nix-community/haumea/blob/main/src/matchers/extension.nix)
+
+Type: `String -> ({ self, super, root, ... } -> Path -> a }) -> Matcher`
+
+Matches files with the given extension.
+`matchers.extension "foo"` matches `a.foo` and `a.b.foo`, but not `.foo`.
+
 ## `matchers.nix`
 
 Source: [`src/matchers/nix.nix`](https://github.com/nix-community/haumea/blob/main/src/matchers/nix.nix)
 
 Type: `({ self, super, root, ... } -> Path -> a }) -> Matcher`
 
-Matches files that end in `.nix`. This is the default matcher if no matchers are defined.
+Matches files that end in `.nix`. This is equivalent to `matchers.extension "nix"`.
+
+This is the default matcher if no matchers are defined.
 
 ## `matchers.regex`
 

diff --git a/src/matchers/extension.nix b/src/matchers/extension.nix
@@ -0,0 +1,16 @@
+{ lib }:
+
+let
+  inherit (builtins)
+    stringLength
+    ;
+  inherit (lib)
+    hasSuffix
+    ;
+in
+
+ext: f: {
+  matches = file: hasSuffix ".${ext}" file
+    && stringLength file > (stringLength ext + 1);
+  loader = f;
+}

diff --git a/src/matchers/nix.nix b/src/matchers/nix.nix
@@ -1,15 +1,3 @@
-{ lib }:
+{ super }:
 
-let
-  inherit (builtins)
-    stringLength
-    ;
-  inherit (lib)
-    hasSuffix
-    ;
-in
-
-f: {
-  matches = file: hasSuffix ".nix" file && stringLength file > 4;
-  loader = f;
-}
+super.extension "nix"