fix: normalize guessed languages from enry

- In the case that Enry correctly recognized the language, but returns
the language name in a way that isn't recognized by enry. Although
overkill I've added a map such that new entries should be easier to add.
- Resolves #6077
- Added unit test

modules/highlight/highlight.go

@@ -134,6 +134,12 @@ func CodeFromLexer(lexer chroma.Lexer, code string) template.HTML {
 	return template.HTML(strings.TrimSuffix(htmlbuf.String(), "\n"))
 }
 
+// For the case where Enry recognizes the language, but doesn't use the naming
+// that Chroma expects.
+var normalizeEnryToChroma = map[string]string{
+	"F#": "FSharp",
+}
+
 // File returns a slice of chroma syntax highlighted HTML lines of code and the matched lexer name
 func File(fileName, language string, code []byte) ([]template.HTML, string, error) {
 	NewContext()
@@ -162,6 +168,9 @@ func File(fileName, language string, code []byte) ([]template.HTML, string, erro
 
 	if lexer == nil {
 		guessLanguage := analyze.GetCodeLanguage(fileName, code)
+		if normalizedGuessLanguage, ok := normalizeEnryToChroma[guessLanguage]; ok {
+			guessLanguage = normalizedGuessLanguage
+		}
 
 		lexer = lexers.Get(guessLanguage)
 		if lexer == nil {

modules/highlight/highlight_test.go

@@ -115,6 +115,12 @@ c=2
 			want:      lines(""),
 			lexerName: "ObjectPascal",
 		},
+		{
+			name:      "test.fs",
+			code:      "module Crypt = let generateCryptTable: array<uint32> =",
+			want:      lines(`<span class="k">module</span> <span class="nn">Crypt</span> <span class="o">=</span> <span class="k">let</span> <span class="nv">generateCryptTable</span><span class="o">:</span> <span class="n">array</span><span class="o">&lt;</span><span class="kt">uint32</span><span class="o">&gt;</span> <span class="o">=</span>`),
+			lexerName: "FSharp",
+		},
 	}
 
 	for _, tt := range tests {