From 9a68591255747c82fd4ce99351bca6d43349cafa Mon Sep 17 00:00:00 2001
From: tjpcc <tjp@ctrl-c.club>
Date: Sun, 3 Sep 2023 19:58:18 -0600
Subject: implement gophernicus extensions for gophermaps

---
 gopher/gophermap/listdir.go | 154 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 gopher/gophermap/listdir.go

(limited to 'gopher/gophermap/listdir.go')

diff --git a/gopher/gophermap/listdir.go b/gopher/gophermap/listdir.go
new file mode 100644
index 0000000..8d66277
--- /dev/null
+++ b/gopher/gophermap/listdir.go
@@ -0,0 +1,154 @@
+package gophermap
+
+import (
+	"bufio"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"tildegit.org/tjp/sliderule/gopher"
+	"tildegit.org/tjp/sliderule/internal/types"
+)
+
+// ListDir builds a gopher menu representing the contents of a directory.
+func ListDir(dir string, location *url.URL) (gopher.MapDocument, error) {
+	return listDir(dir, location, nil, nil)
+}
+
+func listDir(dir string, location *url.URL, hidden map[string]struct{}, extensions map[string]types.Status) (gopher.MapDocument, error) {
+	contents, err := os.ReadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	doc := gopher.MapDocument{}
+
+	for _, entry := range contents {
+		name := entry.Name()
+
+		if _, ok := hidden[name]; ok || name == "gophermap" {
+			continue
+		}
+
+		var code types.Status
+
+		ext := strings.TrimPrefix(filepath.Ext(name), ".")
+		if entry.IsDir() {
+			code = gopher.MenuType
+		} else if c, ok := extensions[ext]; ok && ext != "" {
+			code = c
+		} else {
+			switch ext {
+			case "gophermap":
+				code = gopher.MenuType
+			case "exe", "bin", "out":
+				code = gopher.BinaryFileType
+			case "gif":
+				code = gopher.GifFileType
+			case "jpg", "jpeg", "tif", "tiff":
+				code = gopher.ImageFileType
+			case "bmp":
+				code = gopher.BitmapType
+			case "mp4", "mov", "avi", "wmv", "webm":
+				code = gopher.MovieFileType
+			case "pcm", "aiff", "mp3", "aac", "ogg", "wma", "flac", "alac":
+				code = gopher.SoundFileType
+			case "doc", "docx", "odt", "fodt":
+				code = gopher.DocumentType
+			case "html":
+				code = gopher.HTMLType
+			case "png":
+				code = gopher.PngImageFileType
+			case "rtf":
+				code = gopher.RtfDocumentType
+			case "wav":
+				code = gopher.WavSoundFileType
+			case "pdf":
+				code = gopher.PdfDocumentType
+			case "xml", "atom":
+				code = gopher.XmlDocumentType
+			default:
+				code = gopher.TextFileType
+			}
+		}
+
+		doc = append(doc, gopher.MapItem{
+			Type:     code,
+			Display:  displayName(dir, entry),
+			Selector: path.Join(path.Dir(location.Path), name),
+			Hostname: location.Hostname(),
+			Port:     location.Port(),
+		})
+	}
+
+	return doc, nil
+}
+
+func displayName(dir string, entry os.DirEntry) string {
+	fname := entry.Name()
+
+	// if is a gophermap, use !title or filename
+	if strings.HasSuffix(fname, ".gophermap") {
+		if title := gophermapTitle(dir, fname); title != "" {
+			return title
+		}
+		return fname
+	}
+
+	if entry.IsDir() {
+		if tag := tagTitle(dir, fname); tag != "" {
+			return tag
+		}
+
+		if title := gophermapTitle(dir, filepath.Join(fname, "gophermap")); title != "" {
+			return title
+		}
+	}
+
+	return fname
+}
+
+func gophermapTitle(dir, name string) string {
+	file, err := os.Open(filepath.Join(dir, name))
+	if err != nil {
+		return ""
+	}
+	defer func() {
+		_ = file.Close()
+	}()
+
+	rdr := bufio.NewReader(file)
+	line, err := rdr.ReadString('\n')
+	if err != nil {
+		return ""
+	}
+
+	if !strings.HasPrefix(line, "!") {
+		return ""
+	}
+	return strings.TrimRight(line[1:], "\r\n")
+}
+
+func tagTitle(parent, name string) string {
+	file, err := os.Open(filepath.Join(parent, name, "gophertag"))
+	if err != nil {
+		return ""
+	}
+	defer func() {
+		_ = file.Close()
+	}()
+
+	stat, err := file.Stat()
+	if err != nil || stat.IsDir() {
+		return ""
+	}
+
+	rdr := bufio.NewReader(file)
+	line, err := rdr.ReadString('\n')
+	if err != nil {
+		return ""
+	}
+	return strings.TrimRight(line, "\r\n")
+}
-- 
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