Get line numbers style from Chroma style

build.sh

@@ -26,3 +26,6 @@ fi
 # This line must be last in the script so that its return code
 # propagates properly to its caller
 go build -ldflags="-s -w -X main.versionString=${VERSION}" -o "${BINARY}"
+
+# Alternative build line, if you want to attach to the running process in the Go debugger:
+# go build -ldflags="-X main.versionString=${VERSION}" -gcflags='-N -l' -o "${BINARY}"

m/styling.go

@@ -77,8 +77,13 @@ func styleUi(chromaStyle *chroma.Style, chromaFormatter *chroma.Formatter, statu
 		return
 	}
 
-	// FIXME: Get this from the Chroma style
-	lineNumbersStyle = twin.StyleDefault.WithAttr(twin.AttrDim)
+	chromaLineNumbers := twinStyleFromChroma(chromaStyle, chromaFormatter, chroma.LineNumbers)
+	if chromaLineNumbers != nil {
+		// If somebody can provide an example where not-dimmed line numbers
+		// looks good I'll change this, but until then they will be dimmed no
+		// matter what the theme authors think.
+		lineNumbersStyle = chromaLineNumbers.WithAttr(twin.AttrDim)
+	}
 
 	if standoutStyle != nil {
 		statusbarStyle = *standoutStyle