languages: copy over latest version from sourcegraph

I realised we haven't been updating this package as we updated the
package in the sourcegraph repo.

We don't need all the functionality it has, but its easier to just copy
paste everything.

Test Plan: go test

go.mod

@@ -53,6 +53,7 @@ require (
 	golang.org/x/sys v0.25.0
 	google.golang.org/grpc v1.66.1
 	google.golang.org/protobuf v1.34.2
+	pgregory.net/rapid v1.1.0
 )
 
 require (

go.sum

@@ -572,4 +572,6 @@ honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 mvdan.cc/gofumpt v0.4.0 h1:JVf4NN1mIpHogBj7ABpgOyZc65/UUOkKQFkoURsz4MM=
 mvdan.cc/gofumpt v0.4.0/go.mod h1:PljLOHDeZqgS8opHRKLzp2It2VBuSdteAgqUfzMTxlQ=
+pgregory.net/rapid v1.1.0 h1:CMa0sjHSru3puNx+J0MIAuiiEV4N0qj8/cMWGBBCsjw=
+pgregory.net/rapid v1.1.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

internal/languages/enry_vendored.go

@@ -0,0 +1,15 @@
+package languages
+
+import "strings"
+
+// This file contains functions private functions
+// vendored from the go-enry codebase.
+
+// convertToAliasKey is vendored from go-enry to make sure
+// we're normalizing strings the same way.
+func convertToAliasKey(langName string) string {
+	ak := strings.SplitN(langName, `,`, 2)[0]
+	ak = strings.Replace(ak, ` `, `_`, -1)
+	ak = strings.ToLower(ak)
+	return ak
+}