Initial Commit

src/buffer.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type Buffer struct {
+	Id       int
+	Name     string
+	Contents string
+	LoadFunc func(buffer *Buffer) error
+	SaveFunc func(buffer *Buffer) error
+}
+
+var Buffers = make(map[int]*Buffer)
+var LastBufferId int
+
+func CreateFileBuffer(filename string) (*Buffer, error) {
+	// Replace tilde with home directory
+	if filename != "~" && strings.HasPrefix(filename, "~/") {
+		homedir, err := os.UserHomeDir()
+
+		if err != nil {
+			return nil, err
+		}
+
+		filename = filepath.Join(homedir, filename[2:])
+	}
+
+	stat, err := os.Stat(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	if !stat.Mode().IsRegular() {
+		return nil, fmt.Errorf("%s is not a regular file", filename)
+	}
+
+	buffer := Buffer{
+		Id:       LastBufferId + 1,
+		Name:     filename,
+		Contents: "",
+		LoadFunc: func(buffer *Buffer) error {
+			content, err := os.ReadFile(filename)
+			if err != nil {
+				return err
+			}
+
+			buffer.Contents = string(content)
+			return nil
+		},
+		SaveFunc: func(buffer *Buffer) error {
+			err := os.WriteFile(filename, []byte(buffer.Contents), 0644)
+			if err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+
+	err = buffer.LoadFunc(&buffer)
+	if err != nil {
+		return nil, err
+	}
+
+	Buffers[buffer.Id] = &buffer
+
+	return &buffer, nil
+}
+
+func CreateBuffer(bufferName string) *Buffer {
+	buffer := Buffer{
+		Id:       LastBufferId + 1,
+		Name:     bufferName,
+		Contents: "\n",
+		LoadFunc: func(buffer *Buffer) error { return nil },
+		SaveFunc: func(buffer *Buffer) error { return nil },
+	}
+
+	Buffers[buffer.Id] = &buffer
+
+	return &buffer
+}