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package gophermap
import (
"bufio"
"net/url"
"os"
"path"
"path/filepath"
"slices"
"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, settings FileSystemSettings) (gopher.MapDocument, error) {
return listDir(dir, location, settings, nil, nil)
}
func listDir(dir string, location *url.URL, settings FileSystemSettings, 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()
inf, err := entry.Info()
if err != nil {
return nil, err
}
if inf.Mode()&4 == 0 {
continue
}
if _, ok := hidden[name]; ok || slices.Contains(settings.DirMaps, name) {
continue
}
var code types.Status
if entry.IsDir() {
code = gopher.MenuType
} else {
ext := strings.TrimPrefix(filepath.Ext(name), ".")
if c, ok := extensions[ext]; ok {
code = c
} else if c, ok := extensions[name]; ok {
code = c
} else {
code = gopher.GuessItemType(name)
}
}
doc = append(doc, gopher.MapItem{
Type: code,
Display: displayName(dir, entry, settings),
Selector: path.Join(path.Dir(location.Path), name),
Hostname: location.Hostname(),
Port: location.Port(),
})
}
return doc, nil
}
func displayName(dir string, entry os.DirEntry, settings FileSystemSettings) string {
fname := entry.Name()
fullpath := filepath.Join(dir, fname)
if entry.Type().IsRegular() && settings.ParseExtended && (strings.HasSuffix(fname, ".gophermap") || slices.Contains(settings.DirMaps, fname)) {
if title := gophermapTitle(fullpath); title != "" {
return title
}
}
if entry.IsDir() {
if settings.DirTag != "" {
if tag := tagTitle(filepath.Join(fullpath, settings.DirTag)); tag != "" {
return tag
}
}
if settings.ParseExtended {
for _, mapname := range settings.DirMaps {
if title := gophermapTitle(filepath.Join(fullpath, mapname)); title != "" {
return title
}
}
}
}
return fname
}
func gophermapTitle(path string) string {
file, err := os.Open(path)
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(path string) string {
file, err := os.Open(path)
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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