From ed32c7fea5ad0fefccab9c99a51ebdae13b3a2f2 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Mon, 16 Mar 2026 23:01:59 +0200
Subject: bump version to v0.2.0

- Add REPL mode with vi keybindings
- Add built-in commands (help, clear, quit/exit)
- Add mage repl target

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 cmd/perc/main.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'cmd')

diff --git a/cmd/perc/main.go b/cmd/perc/main.go
index a5764b5..a9faf76 100644
--- a/cmd/perc/main.go
+++ b/cmd/perc/main.go
@@ -7,6 +7,8 @@ import (
 
 	"codeberg.org/snonux/perc/internal"
 	"codeberg.org/snonux/perc/internal/calculator"
+	"codeberg.org/snonux/perc/internal/repl"
+	"github.com/mattn/go-isatty"
 )
 
 func main() {
@@ -20,6 +22,11 @@ func main() {
 
 func runCommand(args []string) (string, error) {
 	if len(args) < 2 {
+		// No args provided - check if stdin is a TTY for REPL mode
+		if isatty.IsTerminal(os.Stdin.Fd()) {
+			repl.RunREPL()
+			return "", nil
+		}
 		printUsage()
 		return "", fmt.Errorf("no input provided")
 	}
@@ -28,6 +35,12 @@ func runCommand(args []string) (string, error) {
 		return internal.Version, nil
 	}
 
+	// Check for --repl flag
+	if args[1] == "--repl" || args[1] == "repl" {
+		repl.RunREPL()
+		return "", nil
+	}
+
 	input := strings.Join(args[1:], " ")
 	result, err := calculator.Parse(input)
 	if err != nil {
@@ -40,9 +53,12 @@ func runCommand(args []string) (string, error) {
 func printUsage() {
 	fmt.Println("Usage: perc <calculation>")
 	fmt.Println("       perc version")
+	fmt.Println("       perc [--repl|repl]")
 	fmt.Println("\nExamples:")
 	fmt.Println("  perc 20% of 150")
 	fmt.Println("  perc what is 20% of 150")
 	fmt.Println("  perc 30 is what % of 150")
 	fmt.Println("  perc 30 is 20% of what")
+	fmt.Println("\nStart REPL mode interactively by running without arguments:")
+	fmt.Println("  perc")
 }
-- 
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