feat(autocomplete): add autocompletion for fish shell

cli/cli.go

@@ -29,7 +29,7 @@ var AutoCompleteCommand = cli.Command{
 	Description: `
 Set up auto-completion in your shell by downloading the relevant files and
 laying out what additional information must be loaded. Supported shells are as
-follows: bash, fizsh & zsh.
+follows: bash, fish, fizsh & zsh.
 
 Example:
 
@@ -50,6 +50,7 @@ Example:
 			"bash":  true,
 			"zsh":   true,
 			"fizsh": true,
+			"fish":  true,
 		}
 
 		if _, ok := supportedShells[shellType]; !ok {
@@ -93,6 +94,14 @@ sudo mkdir /etc/zsh/completion.d/
 sudo cp %s /etc/zsh/completion.d/abra
 echo "PROG=abra\n_CLI_ZSH_AUTOCOMPLETE_HACK=1\nsource /etc/zsh/completion.d/abra" >> ~/.zshrc
 # And finally run "abra app ps <hit tab key>" to test things are working, you should see app domains listed!
+`, autocompletionFile))
+		case "fish":
+			fmt.Println(fmt.Sprintf(`
+# Run the following commands to install auto-completion
+sudo mkdir -p /etc/fish/completions
+sudo cp %s /etc/fish/completions/abra
+echo "source /etc/fish/completions/abra" >> ~/.config/fish/config.fish
+# And finally run "abra app ps <hit tab key>" to test things are working, you should see app domains listed!
 `, autocompletionFile))
 		}