Add editor packages

internal/editor/editor.go

@@ -0,0 +1,83 @@
+package editor
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"sync"
+
+	"code.chimeric.al/dwrz/wen/internal/editor/buffer"
+	"code.chimeric.al/dwrz/wen/internal/editor/canvas"
+	"code.chimeric.al/dwrz/wen/internal/editor/event"
+	"code.chimeric.al/dwrz/wen/internal/editor/prompt"
+	"code.chimeric.al/dwrz/wen/pkg/terminal"
+	"code.chimeric.al/dwrz/wen/pkg/terminal/input"
+)
+
+// TODO: add undo and redo.
+// TODO: add search and replace.
+type Editor struct {
+	canvas   *canvas.Canvas
+	input    chan *input.Event
+	log      *slog.Logger
+	events   chan event.Event
+	reader   *input.Reader
+	terminal *terminal.Terminal
+	tmpdir   string
+
+	mu      sync.Mutex
+	active  *buffer.Buffer
+	buffers map[string]*buffer.Buffer
+	prompt  *prompt.Prompt
+}
+
+type Parameters struct {
+	In       *os.File
+	Log      *slog.Logger
+	Out      *os.File
+	TempDir  string
+	Terminal *terminal.Terminal
+}
+
+// TODO: read text piped in from stdin.
+// TODO: pipe buffer texts through shell command.
+func New(p Parameters) (*Editor, error) {
+	var editor = &Editor{
+		buffers:  map[string]*buffer.Buffer{},
+		events:   make(chan event.Event),
+		input:    make(chan *input.Event),
+		log:      p.Log,
+		terminal: p.Terminal,
+		tmpdir:   p.TempDir,
+		prompt:   prompt.New(prompt.Parameters{Log: p.Log}),
+	}
+
+	// Setup user input.
+	editor.reader = input.New(input.Parameters{
+		Chan: editor.input,
+		In:   p.In,
+		Log:  p.Log,
+	})
+
+	// Setup the canvas.
+	editor.canvas = canvas.New(canvas.Parameters{
+		Log:      p.Log,
+		Out:      p.Out,
+		Terminal: p.Terminal,
+	})
+
+	// Create the initial scratch buffer.
+	scratch, err := buffer.Create(buffer.NewBufferParams{
+		Name: editor.tmpdir + "/scratch",
+		Log:  editor.log,
+	})
+	if err != nil {
+		return nil, fmt.Errorf(
+			"failed to create scratch buffer: %v", err,
+		)
+	}
+	editor.active = scratch
+	editor.buffers[scratch.Name()] = scratch
+
+	return editor, nil
+}