Skip .bzl files generated by cargo raze.

Broken by #45.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

main.go

@@ -270,12 +270,15 @@ func hashBang(b []byte) []byte {
 	return nil
 }
 
-var reGenerated = regexp.MustCompile(`(?m)^.{1,2} Code generated .* DO NOT EDIT\.$`)
+// go generate: ^// Code generated .* DO NOT EDIT\.$
+var goGenerated = regexp.MustCompile(`(?m)^.{1,2} Code generated .* DO NOT EDIT\.$`)
+// cargo raze: ^DO NOT EDIT! Replaced on runs of cargo-raze$
+var cargoRazeGenerated = regexp.MustCompile(`(?m)^DO NOT EDIT! Replaced on runs of cargo-raze$`)
 
 // isGenerated returns true if it contains a string that implies the file was
 // generated.
 func isGenerated(b []byte) bool {
-	return reGenerated.Match(b)
+	return goGenerated.Match(b) || cargoRazeGenerated.Match(b)
 }
 
 func hasLicense(b []byte) bool {

testdata/expected/file_generated.bzl

@@ -0,0 +1,22 @@
+"""
+cargo-raze crate workspace functions
+
+DO NOT EDIT! Replaced on runs of cargo-raze
+"""
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def _new_http_archive(name, **kwargs):
+    if not native.existing_rule(name):
+        http_archive(name=name, **kwargs)
+
+def raze_fetch_remote_crates():
+
+    _new_http_archive(
+        name = "raze__log__0_4_11",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/log/log-0.4.11.crate",
+        type = "tar.gz",
+        sha256 = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b",
+        strip_prefix = "log-0.4.11",
+        build_file = Label("//bazel/cargo/remote:log-0.4.11.BUILD"),
+    )
+

testdata/initial/file_generated.bzl

@@ -0,0 +1,22 @@
+"""
+cargo-raze crate workspace functions
+
+DO NOT EDIT! Replaced on runs of cargo-raze
+"""
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def _new_http_archive(name, **kwargs):
+    if not native.existing_rule(name):
+        http_archive(name=name, **kwargs)
+
+def raze_fetch_remote_crates():
+
+    _new_http_archive(
+        name = "raze__log__0_4_11",
+        url = "https://crates-io.s3-us-west-1.amazonaws.com/crates/log/log-0.4.11.crate",
+        type = "tar.gz",
+        sha256 = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b",
+        strip_prefix = "log-0.4.11",
+        build_file = Label("//bazel/cargo/remote:log-0.4.11.BUILD"),
+    )
+