✨ Support text/x-ansi - fixes #45

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Wrapped list items are indented to stay behind the bullet (#35)
 - Certificate expiry date is stored when the cert IDs match (#39)
 - What link was selected is remembered as you browse through history
+- Render ANSI codes in `text/x-ansi` pages, or text pages that end with `.ans`
 
 ### Changed
 - Pages are rewrapped dynamically, whenever the terminal size changes (#33)

display/private.go

@@ -127,6 +127,8 @@ func reformatPage(p *structs.Page) {
 		rendered, _ = renderer.RenderGemini(p.Raw, textWidth(), leftMargin())
 	} else if p.Mediatype == structs.TextPlain {
 		rendered = renderer.RenderPlainText(p.Raw, leftMargin())
+	} else if p.Mediatype == structs.TextAnsi {
+		rendered = renderer.RenderANSI(p.Raw, leftMargin())
 	} else {
 		// Rendering this type is not implemented
 		return

renderer/page.go

@@ -109,14 +109,25 @@ func MakePage(url string, res *gemini.Response, width, leftMargin int) (*structs
 			Links:     links,
 		}, nil
 	} else if strings.HasPrefix(mediatype, "text/") {
-		// Treated as plaintext
-		return &structs.Page{
-			Mediatype: structs.TextPlain,
-			Url:       url,
-			Raw:       utfText,
-			Content:   RenderPlainText(utfText, leftMargin),
-			Links:     []string{},
-		}, nil
+		if mediatype == "text/x-ansi" || strings.HasSuffix(url, ".ans") {
+			// ANSI
+			return &structs.Page{
+				Mediatype: structs.TextAnsi,
+				Url:       url,
+				Raw:       utfText,
+				Content:   RenderANSI(utfText, leftMargin),
+				Links:     []string{},
+			}, nil
+		} else {
+			// Treated as plaintext
+			return &structs.Page{
+				Mediatype: structs.TextPlain,
+				Url:       url,
+				Raw:       utfText,
+				Content:   RenderPlainText(utfText, leftMargin),
+				Links:     []string{},
+			}, nil
+		}
 	}
 
 	return nil, errors.New("displayable mediatype is not handled in the code, implementation error")

renderer/renderer.go

@@ -13,6 +13,21 @@ import (
 	"gitlab.com/tslocum/cview"
 )
 
+// RenderANSI renders plain text pages containing ANSI codes.
+// Practically, it is used for the text/x-ansi.
+func RenderANSI(s string, leftMargin int) string {
+	s = cview.Escape(s)
+	if viper.GetBool("a-general.color") {
+		s = cview.TranslateANSI(s)
+	}
+	var shifted string
+	lines := strings.Split(s, "\n")
+	for i := range lines {
+		shifted += strings.Repeat(" ", leftMargin) + lines[i] + "\n"
+	}
+	return shifted
+}
+
 // RenderPlainText should be used to format plain text pages.
 func RenderPlainText(s string, leftMargin int) string {
 	var shifted string

structs/structs.go

@@ -5,6 +5,7 @@ type Mediatype string
 const (
 	TextGemini Mediatype = "text/gemini"
 	TextPlain  Mediatype = "text/plain"
+	TextAnsi   Mediatype = "text/x-ansi"
 )
 
 type PageMode int