feat(installer): set default `editor`

Attempt to set and locate a default editor when running the installer.

cmd/cheat/str_config.go

@@ -9,7 +9,7 @@ import (
 func configs() string {
 	return strings.TrimSpace(`---
 # The editor to use with 'cheat -e <sheet>'. Defaults to $EDITOR or $VISUAL.
-# editor: vim
+editor: EDITOR_PATH
 
 # Should 'cheat' always colorize output?
 colorize: false

configs/conf.yml

@@ -1,6 +1,6 @@
 ---
 # The editor to use with 'cheat -e <sheet>'. Defaults to $EDITOR or $VISUAL.
-# editor: vim
+editor: EDITOR_PATH
 
 # Should 'cheat' always colorize output?
 colorize: false

internal/config/editor.go

@@ -15,11 +15,22 @@ func Editor() (string, error) {
 		return "notepad", nil
 	}
 
-	// look for `nano` on the `PATH`
+	// look for `nano` and `vim` on the `PATH`
+	def, _ := exec.LookPath("editor") // default `editor` wrapper
 	nano, _ := exec.LookPath("nano")
+	vim, _ := exec.LookPath("vim")
 
-	// search for `$VISUAL`, `$EDITOR`, and then `nano`, in that order
-	for _, editor := range []string{os.Getenv("VISUAL"), os.Getenv("EDITOR"), nano} {
+	// set editor priority
+	editors := []string{
+		os.Getenv("VISUAL"),
+		os.Getenv("EDITOR"),
+		def,
+		nano,
+		vim,
+	}
+
+	// return the first editor that was found per the priority above
+	for _, editor := range editors {
 		if editor != "" {
 			return editor, nil
 		}

internal/installer/run.go

@@ -20,11 +20,18 @@ func Run(configs string, confpath string) error {
 	community := filepath.Join(confdir, "cheatsheets", "community")
 	personal := filepath.Join(confdir, "cheatsheets", "personal")
 
-	// template the above paths into the default configs
+	// set default cheatpaths
 	configs = strings.Replace(configs, "COMMUNITY_PATH", community, -1)
 	configs = strings.Replace(configs, "PERSONAL_PATH", personal, -1)
+
+	// locate and set a default pager
 	configs = strings.Replace(configs, "PAGER_PATH", config.Pager(), -1)
 
+	// locate and set a default editor
+	if editor, err := config.Editor(); err == nil {
+		configs = strings.Replace(configs, "EDITOR_PATH", editor, -1)
+	}
+
 	// prompt the user to download the community cheatsheets
 	yes, err := Prompt(
 		"Would you like to download the community cheatsheets? [Y/n]",