utils: Add helper to get all repos

This does a filepath.WalkDir of the config.ScanPath and tries to find
all valid git repos. It returns a list of repoInfo structs holding basic
information of each repository.

routes/util.go

@@ -1,8 +1,11 @@
 package routes
 
 import (
+	"io/fs"
+	"log"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"git.icyphox.sh/legit/git"
 )
@@ -31,3 +34,57 @@ func (d *deps) isIgnored(name string) bool {
 
 	return false
 }
+
+type repoInfo struct {
+	Git      *git.GitRepo
+	Path     string
+	Category string
+}
+
+func (d *deps) getAllRepos() ([]repoInfo, error) {
+	repos := []repoInfo{}
+	max := strings.Count(d.c.Repo.ScanPath, string(os.PathSeparator)) + 2
+
+	err := filepath.WalkDir(d.c.Repo.ScanPath, func(path string, de fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if de.IsDir() {
+			// Check if we've exceeded our recursion depth
+			if strings.Count(path, string(os.PathSeparator)) > max {
+				return fs.SkipDir
+			}
+
+			if d.isIgnored(path) {
+				return fs.SkipDir
+			}
+
+			// A bare repo should always have at least a HEAD file, if it
+			// doesn't we can continue recursing
+			if _, err := os.Lstat(filepath.Join(path, "HEAD")); err == nil {
+				repo, err := git.Open(path, "")
+				if err != nil {
+					log.Println(err)
+				} else {
+					relpath, _ := filepath.Rel(d.c.Repo.ScanPath, path)
+					repos = append(repos, repoInfo{
+						Git:      repo,
+						Path:     relpath,
+						Category: d.category(path),
+					})
+					// Since we found a Git repo, we don't want to recurse
+					// further
+					return fs.SkipDir
+				}
+			}
+		}
+		return nil
+	})
+
+	return repos, err
+}
+
+func (d *deps) category(path string) string {
+	return strings.TrimPrefix(filepath.Dir(strings.TrimPrefix(path, d.c.Repo.ScanPath)), string(os.PathSeparator))
+}