refactor(repo): create `repo` package

- Refactor `installer.clone` into new `repo.Clone` package and method.

- Refactor `sheets.isGitDir` into `repo.GitDir`.

Both of these changes read better, and will facilitate cleaner
architecture when `--update` is implemented.

internal/installer/run.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/cheat/cheat/internal/config"
+	"github.com/cheat/cheat/internal/repo"
 )
 
 // Run runs the installer
@@ -45,7 +46,7 @@ func Run(configs string, confpath string) error {
 	if yes {
 		// clone the community cheatsheets
 		fmt.Printf("Cloning community cheatsheets to %s.\n", community)
-		if err := clone(community); err != nil {
+		if err := repo.Clone(community); err != nil {
 			return fmt.Errorf("failed to clone cheatsheets: %v", err)
 		}
 

internal/repo/clone.go

@@ -1,4 +1,4 @@
-package installer
+package repo
 
 import (
 	"fmt"
@@ -7,11 +7,11 @@ import (
 	"github.com/go-git/go-git/v5"
 )
 
-// clone clones the community cheatsheets
-func clone(path string) error {
+// Clone clones the repo available at `url`
+func Clone(url string) error {
 
 	// clone the community cheatsheets
-	_, err := git.PlainClone(path, false, &git.CloneOptions{
+	_, err := git.PlainClone(url, false, &git.CloneOptions{
 		URL:      "https://github.com/cheat/cheatsheets.git",
 		Depth:    1,
 		Progress: os.Stdout,

internal/repo/gitdir.go

@@ -1,4 +1,4 @@
-package sheets
+package repo
 
 import (
 	"fmt"
@@ -6,9 +6,9 @@ import (
 	"strings"
 )
 
-// isGitDir returns `true` if `path` is within a `.git` directory, or `false`
-// otherwise
-func isGitDir(path string) (bool, error) {
+// GitDir returns `true` if we are iterating over a directory contained within
+// a repositories `.git` directory.
+func GitDir(path string) (bool, error) {
 
 	/*
 		A bit of context is called for here, because this functionality has

internal/repo/update.go

@@ -0,0 +1 @@
+package repo

internal/sheets/load.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	cp "github.com/cheat/cheat/internal/cheatpath"
+	"github.com/cheat/cheat/internal/repo"
 	"github.com/cheat/cheat/internal/sheet"
 )
 
@@ -52,7 +53,7 @@ func Load(cheatpaths []cp.Cheatpath) ([]map[string]sheet.Sheet, error) {
 				// Don't walk the `.git` directory. Doing so creates
 				// hundreds/thousands of needless syscalls and could
 				// potentially harm performance on machines with slow disks.
-				skip, err := isGitDir(path)
+				skip, err := repo.GitDir(path)
 				if err != nil {
 					return fmt.Errorf("failed to identify .git directory: %v", err)
 				}