fix InitCommand() (#285)

split modules/config

login_tasks.go should probably be modules/task/login.go,
but i didn't do that, as it still depends on the global
`Config` variable from the config module, see
https://gitea.com/gitea/tea/issues/158

rework InitCommand()

- make it error tolerant if $PWD is not a git repo (#200)
- don't force default login when repo flag is set (#191)

remove InitCommandLoginOnly()

Merge branch 'master' into issue-200-initcommand

improve docs

Merge branch 'master' into issue-200-initcommand

move config func and config task func to right place

Co-authored-by: Norwin Roosen <git@nroo.de>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/285
Reviewed-by: 6543 <6543@obermui.de>
Reviewed-by: khmarbaise <khmarbaise@noreply.gitea.io>
Co-Authored-By: Norwin <noerw@noreply.gitea.io>
Co-Committed-By: Norwin <noerw@noreply.gitea.io>

modules/git/repo.go

@@ -16,18 +16,14 @@ type TeaRepo struct {
 // RepoForWorkdir tries to open the git repository in the local directory
 // for reading or modification.
 func RepoForWorkdir() (*TeaRepo, error) {
-	repo, err := git.PlainOpenWithOptions("./", &git.PlainOpenOptions{
-		DetectDotGit: true,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return &TeaRepo{repo}, nil
+	return RepoFromPath("")
 }
 
 // RepoFromPath tries to open the git repository by path
 func RepoFromPath(path string) (*TeaRepo, error) {
+	if len(path) == 0 {
+		path = "./"
+	}
 	repo, err := git.PlainOpenWithOptions(path, &git.PlainOpenOptions{
 		DetectDotGit: true,
 	})