Add a "dump" output option to git-list

It prints a list of all repos URL and is supposed to be consumed by `git get --dump` option.

pkg/cfg/config.go

@@ -18,12 +18,12 @@ const GitgetPrefix = "gitget"
 const (
 	KeyBranch      = "branch"
 	DefBranch      = "master"
-	KeyBundle      = "bundle"
+	KeyDump        = "dump"
 	KeyDefaultHost = "defaultHost"
 	DefDefaultHost = "github.com"
 	KeyFetch       = "fetch"
 	KeyOutput      = "out"
-	DefOutput      = OutSimple
+	DefOutput      = OutTree
 	KeyPrivateKey  = "privateKey"
 	DefPrivateKey  = "id_rsa"
 	KeyReposRoot   = "reposRoot"
@@ -32,9 +32,10 @@ const (
 
 // Allowed values for the --out flag
 const (
-	OutFlat   = "flat"
-	OutSmart  = "smart"
-	OutSimple = "simple"
+	OutDump  = "dump"
+	OutFlat  = "flat"
+	OutTree  = "tree"
+	OutSmart = "smart"
 )
 
 // Version metadata set by ldflags during the build.

pkg/print/dump.go

@@ -0,0 +1,37 @@
+package print
+
+import (
+	"git-get/pkg/git"
+	"strings"
+)
+
+type DumpPrinter struct{}
+
+// Print generates a list of repos URLs. Each line contains a URL and, if applicable, a currently checked out branch name.
+// It's a way to dump all repositories managed by git-get and is supposed to be consumed by `git get --dump`.
+func (p *DumpPrinter) Print(_ string, repos []*git.Repo) string {
+	var str strings.Builder
+
+	for i, repo := range repos {
+		remotes, err := repo.Remotes()
+		if err != nil || len(remotes) == 0 {
+			continue
+		}
+
+		// TODO: Needs work. Right now we're just assuming the first remote is the origin one and the one from which the current branch is checked out.
+		url := remotes[0].Config().URLs[0]
+		current := repo.Status.CurrentBranch
+
+		str.WriteString(url)
+
+		if current != git.StatusDetached && current != git.StatusUnknown {
+			str.WriteString(" " + current)
+		}
+
+		if i < len(repos)-1 {
+			str.WriteString("\n")
+		}
+	}
+
+	return str.String()
+}