Engage!

1 files changed, 62 insertions, 0 deletions

diff --git a/colors.go b/colors.go
new file mode 100644
index 0000000..d88b968
--- /dev/null
+++ b/colors.go
@@ -0,0 +1,62 @@
+package main
+
+// Utility to print all 256 terminal colors. This is useful for debugging themes
+// and ensuring the terminal supports the expected color range.
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/nsf/termbox-go"
+)
+
+// PrintColors initializes termbox and draws a grid of all 256 available colors.
+func PrintColors() {
+	err := termbox.Init()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to init termbox: %v\n", err)
+		return
+	}
+	defer termbox.Close()
+
+	// Enable 256-color mode for the output.
+	termbox.SetOutputMode(termbox.Output256)
+	termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
+
+	w, _ := termbox.Size()
+
+	// Adjust grid columns based on terminal width.
+	cols := 16
+	if w < 64 {
+		cols = 8
+	}
+
+	// Loop through all 256 colors and draw them in a grid.
+	for i := 0; i < 256; i++ {
+		row := (i / cols) * 2
+		col := (i % cols) * 5
+
+		bg := termbox.Attribute(i)
+		fg := termbox.ColorWhite
+		// Ensure text is readable against light/dark backgrounds.
+		if i == 7 || i > 240 {
+			fg = termbox.ColorBlack
+		}
+
+		// Draw the color index and a colored block.
+		str := fmt.Sprintf("%5d", i)
+		for j, r := range str {
+			termbox.SetCell(col+j, row, r, fg, bg)
+			termbox.SetCell(col+j, row+1, ' ', fg, bg)
+		}
+	}
+
+	msg := "Press any key to exit..."
+	for i, r := range msg {
+		termbox.SetCell(i, (256/cols)*2, r, termbox.ColorWhite, termbox.ColorDefault)
+	}
+
+	termbox.Flush()
+	// Wait for any key press before closing.
+	termbox.PollEvent()
+}