Remove gogit and major refactoring (#2)

* Fix typo in readme

* Reimplement all git methods without go-git

* Rename repo pkg to git, add gitconfig methods

* Improve tests for configuration reading

* Rename package file to io and move RepoFinder there

* Refactor printers

- Remove smart printer
- Decouple printers from git repos with interfaces
- Update printer functions
- Remove unnecessary flags
- Add better remote URL detection

* Update readme and go.mod

* Add author to git commit in tests

Otherwise tests will fail in CI.

* Install git before running tests and don't use cgo

* Add better error message, revert installing git

* Ensure commit message is in quotes

* Set up git config before running tests

pkg/print/dump.go

@@ -1,31 +1,40 @@
 package print
 
 import (
-	"git-get/pkg/repo"
 	"strings"
 )
 
-// DumpPrinter implements Printer interface and provides method for printing list of repos in dump file format.
+// DumpRepo is a git repository printable into a dump file.
+type DumpRepo interface {
+	Path() string
+	Remote() (string, error)
+	CurrentBranch() (string, error)
+}
+
+// DumpPrinter prints a list of repos in a dump file format.
 type DumpPrinter struct{}
 
+// NewDumpPrinter creates a DumpPrinter.
+func NewDumpPrinter() *DumpPrinter {
+	return &DumpPrinter{}
+}
+
 // 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 []*repo.Repo) string {
+func (p *DumpPrinter) Print(repos []DumpRepo) string {
 	var str strings.Builder
 
 	for i, r := range repos {
-		remotes, err := r.Remotes()
-		if err != nil || len(remotes) == 0 {
+		url, err := r.Remote()
+		if err != nil {
 			continue
+			// TODO: handle error?
 		}
 
-		// 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 := r.Status.CurrentBranch
-
 		str.WriteString(url)
 
-		if current != repo.StatusDetached && current != repo.StatusUnknown {
+		current, err := r.CurrentBranch()
+		if err != nil || current != detached {
 			str.WriteString(" " + current)
 		}