1 files changed, 107 insertions, 0 deletions
diff --git a/editor/editor.go b/editor/editor.go
new file mode 100644
index 0000000..67f0ab3
--- /dev/null
+++ b/editor/editor.go
@@ -0,0 +1,107 @@
+package editor
+
+import (
+	"path/filepath"
+	"time"
+
+	"github.com/prodhe/poe/gapbuffer"
+)
+
+// Editor is the edit component that holds text buffers. A UI of some sort operates on the editor to manipulate buffers.
+type Editor interface {
+	NewBuffer() (id int64, buf *Buffer)
+	Buffer(id int64) *Buffer
+	Buffers() ([]int64, []*Buffer)
+	Current() *Buffer
+	LoadBuffers(filenames []string)
+	CloseBuffer(id int64)
+	WorkDir() string
+	Len() int
+	Run(cmd string)
+}
+
+// New returns an empty editor with no buffers loaded.
+func New() Editor {
+	e := &editor{}
+	e.buffers = map[int64]*Buffer{}
+	e.workdir, _ = filepath.Abs(".")
+	e.initCommands()
+	return e
+}
+
+// editor implements Editor.
+type editor struct {
+	buffers map[int64]*Buffer
+	current int64 // id ref to current buffer
+	workdir string
+}
+
+// NewBuffer creates an empty buffer and appends it to the editor. Returns the new id and the new buffer.
+func (e *editor) NewBuffer() (id int64, buf *Buffer) {
+	buf = &Buffer{buf: &gapbuffer.Buffer{}}
+	id = e.genBufferID()
+	e.buffers[id] = buf
+	e.current = id
+	return id, buf
+}
+
+// Buffer returns the buffer with given index. Nil if id not found.
+func (e *editor) Buffer(id int64) *Buffer {
+	if _, ok := e.buffers[id]; ok {
+		e.current = id
+	}
+	return e.buffers[id]
+}
+
+// Buffers returns a slice of IDs and a slice of buffers.
+func (e *editor) Buffers() ([]int64, []*Buffer) {
+	ids := make([]int64, 0, len(e.buffers))
+	bs := make([]*Buffer, 0, len(e.buffers))
+	for i, b := range e.buffers {
+		ids = append(ids, i)
+		bs = append(bs, b)
+	}
+	return ids, bs
+}
+
+// Current returns the current buffer.
+func (e *editor) Current() *Buffer {
+	return e.buffers[e.current]
+}
+
+// CloseBuffer deletes the given buffer from memory. No warnings. Here be dragons.
+func (e *editor) CloseBuffer(id int64) {
+	delete(e.buffers, id)
+}
+
+// Len returns number of buffers currently in the editor.
+func (e *editor) Len() int {
+	return len(e.buffers)
+}
+
+// WorkDir returns the base working directory of the editor.
+func (e *editor) WorkDir() string {
+	if e.workdir == "" {
+		d, _ := filepath.Abs(".")
+		return d
+	}
+	return e.workdir
+}
+
+// LoadBuffers reads files from disk and loads them into windows. Screen need to be initialized.
+func (e *editor) LoadBuffers(fns []string) {
+	// load given filenames and append to buffer list
+	for _, fn := range fns {
+		_, buf := e.NewBuffer()
+		buf.NewFile(fn)
+		buf.ReadFile()
+	}
+
+	if len(fns) == 0 {
+		e.NewBuffer()
+	}
+}
+
+func (e *editor) genBufferID() int64 {
+	return time.Now().UnixNano()
+}