Add go generate setup for SVG icon embedding

- gen_icons.go: reads SVG files, generates icons.go with go:embed
- icons.go: generated file with embedded SVG strings
- Supports cut, copy, paste icons (search, conflict, wrapOn/Off to be added)

icons/cut.svg

@@ -1,7 +1,7 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-  <circle cx="8" cy="18" r="3" fill="none" stroke="currentColor" stroke-width="1.5"/>
+  <circle cx="6" cy="6" r="3"/>
-  <circle cx="16" cy="18" r="3" fill="none" stroke="currentColor" stroke-width="1.5"/>
+  <circle cx="6" cy="18" r="3"/>
-  <path d="M8 15.5L12 6" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <path d="M20 4 8.12 15.12"/>
-  <path d="M16 15.5L12 6" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <path d="M14.8 14.8 20 20"/>
-  <circle cx="12" cy="6" r="1" fill="currentColor"/>
+  <path d="M8.12 8.12 12 12"/>
 </svg>

icons/gen_icons.go

@@ -0,0 +1,104 @@
+//go:build ignore
+
+//go:generate go run gen_icons.go
+
+// gen_icons reads SVG files and generates icons/embedded.go with go:embed directives.
+// Run: go generate ./icons
+
+// To regenerate: cd icons && go run gen_icons.go
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/format"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"text/template"
+)
+
+const output = "icons.go"
+
+var iconTemplate = template.Must(template.New("").Parse(`// Code generated by gen_icons.go; DO NOT EDIT.
+
+package icons
+
+import (
+	_ "embed"
+)
+
+//go:embed {{.Embeds}}
+var svgFS embed.FS
+
+{{range $name, $files := .Icons}}
+// {{$name}}SVG contains the {{$name}} icon SVG source.
+var {{$name}}SVG = ` + "`" + `{{.}}` + "`" + `
+{{end}}
+`))
+
+type iconData struct {
+	Embeds string
+	Icons  map[string]string
+}
+
+func main() {
+	icons := make(map[string]string)
+	var embeds []string
+
+	err := filepath.WalkDir(".", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+		if !strings.HasSuffix(path, ".svg") {
+			return nil
+		}
+
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+
+		name := strings.TrimSuffix(filepath.Base(path), ".svg")
+		icons[name] = string(data)
+		embeds = append(embeds, filepath.Base(path))
+		return nil
+	})
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Sort embeds for deterministic output
+	sort.Strings(embeds)
+
+	data := iconData{
+		Embeds: strings.Join(embeds, " "),
+		Icons:  icons,
+	}
+
+	var buf bytes.Buffer
+	if err := iconTemplate.Execute(&buf, data); err != nil {
+		fmt.Fprintf(os.Stderr, "template error: %v\n", err)
+		os.Exit(1)
+	}
+
+	src, err := format.Source(buf.Bytes())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "format error: %v\n", err)
+		os.Exit(1)
+	}
+
+	if err := os.WriteFile(output, src, 0644); err != nil {
+		fmt.Fprintf(os.Stderr, "write error: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("generated icons.go")
+}

icons/icons.go

@@ -0,0 +1,40 @@
+// Code generated by gen_icons.go; DO NOT EDIT.
+
+package icons
+
+import (
+	_ "embed"
+)
+
+//go:embed copy.svg cut.svg paste.svg
+var svgFS embed.FS
+
+// copySVG contains the copy icon SVG source.
+var copySVG = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <rect x="7" y="7" width="12" height="14" rx="1" fill="none" stroke="currentColor" stroke-width="1.5"/>
+  <rect x="4" y="4" width="12" height="14" rx="1" fill="none" stroke="currentColor" stroke-width="1.5"/>
+</svg>
+`
+
+// cutSVG contains the cut icon SVG source.
+var cutSVG = `<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <!-- Left blade -->
+  <circle cx="7" cy="7" r="4" />
+  <line x1="9.5" y1="9.5" x2="14" y2="14" />
+  <!-- Right blade -->
+  <circle cx="17" cy="7" r="4" />
+  <line x1="14.5" y1="9.5" x2="10" y2="14" />
+  <!-- Handles -->
+  <line x1="7" y1="3" x2="7" y2="11" />
+  <line x1="17" y1="3" x2="17" y2="11" />
+</svg>
+`
+
+// pasteSVG contains the paste icon SVG source.
+var pasteSVG = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <rect x="5" y="6" width="14" height="15" rx="1" fill="none" stroke="currentColor" stroke-width="1.5"/>
+  <path d="M8 6V4.5C8 3.67 8.67 3 9.5 3h5C15.33 3 16 3.67 16 4.5V6" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="8" y1="10" x2="16" y2="10" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="8" y1="14" x2="16" y2="14" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+</svg>
+`