Added support for TSV files

This uses a similar parser as CSV files, except configured for tabs.
Have also fixed the configured parser to ignore column counts.

README.md

@@ -15,10 +15,14 @@ go get github.com/lmika/ted
 ## Usage
 
 ```
-ted <csvfile>
+ted [FLAGS] FILE
 ```
 
-Can either be a new CSV file, or an existing CSV file.
+Flags:
+
+- `-c <codec>` the format that the file is in.  Either `csv` or `tsv` files are supported.  Default is `csv`
+
+File can either be a new file, or an existing file.
 
 TED is similar to Vim in that it is modal.  After opening a file, the editor starts off in view mode, which permits navigating around.
 

main.go

@@ -1,13 +1,14 @@
 package main
 
 import (
-	"github.com/lmika/ted/ui"
 	"flag"
 	"fmt"
+	"github.com/lmika/ted/ui"
 	"os"
 )
 
 func main() {
+	var flagCodec = flag.String("c", "csv", "file codec to use")
 	flag.Parse()
 	if flag.NArg() == 0 {
 		fmt.Fprintln(os.Stderr, "usage: ted FILENAME")
@@ -20,8 +21,14 @@ func main() {
 	}
 	defer uiManager.Close()
 
+	codecBuilder, hasCodec := codecModelSourceBuilders[*flagCodec]
+	if !hasCodec {
+		fmt.Fprintf(os.Stderr, "unrecognised codec: %v", *flagCodec)
+		os.Exit(1)
+	}
+
 	frame := NewFrame(uiManager)
-	session := NewSession(uiManager, frame, CsvFileModelSource{flag.Arg(0)})
+	session := NewSession(uiManager, frame, codecBuilder(flag.Arg(0)))
 	session.LoadFromSource()
 
 	uiManager.SetRootComponent(frame.RootComponent())
@@ -29,3 +36,14 @@ func main() {
 
 	uiManager.Loop()
 }
+
+type codecModelSourceBuilder func(filename string) ModelSource
+
+var codecModelSourceBuilders = map[string]codecModelSourceBuilder{
+	"csv": func(filename string) ModelSource {
+		return NewCsvFileModelSource(filename, CsvFileModelSourceOptions{Comma: ','})
+	},
+	"tsv": func(filename string) ModelSource {
+		return NewCsvFileModelSource(filename, CsvFileModelSourceOptions{Comma: '\t'})
+	},
+}

modelsource.go

@@ -1,10 +1,10 @@
 package main
 
 import (
-	"path/filepath"
-	"os"
 	"encoding/csv"
 	"io"
+	"os"
+	"path/filepath"
 )
 
 // ModelSource is a source of models.  At a minimum, it must be able to read models.
@@ -26,22 +26,34 @@ type WritableModelSource interface {
 
 // A model source backed by a CSV file
 type CsvFileModelSource struct {
-	Filename string
+	filename string
+	options  CsvFileModelSourceOptions
+}
+
+type CsvFileModelSourceOptions struct {
+	Comma rune
+}
+
+func NewCsvFileModelSource(filename string, options CsvFileModelSourceOptions) CsvFileModelSource {
+	return CsvFileModelSource{
+		filename: filename,
+		options:  options,
+	}
 }
 
 // Describes the source
 func (s CsvFileModelSource) String() string {
-	return filepath.Base(s.Filename)
+	return filepath.Base(s.filename)
 }
 
 // Read the model from the given source
 func (s CsvFileModelSource) Read() (Model, error) {
 	// Check if the file exists.  If not, return an empty model
-	if _, err := os.Stat(s.Filename); os.IsNotExist(err) {
+	if _, err := os.Stat(s.filename); os.IsNotExist(err) {
 		return NewSingleCellStdModel(), nil
 	}
 
-	f, err := os.Open(s.Filename)
+	f, err := os.Open(s.filename)
 	if err != nil {
 		return nil, err
 	}
@@ -49,12 +61,13 @@ func (s CsvFileModelSource) Read() (Model, error) {
 
 	model := new(StdModel)
 	r := csv.NewReader(f)
+	r.Comma = s.options.Comma
+	r.FieldsPerRecord = -1
 	for {
 		record, err := r.Read()
 		if err == io.EOF {
 			break
-		}
-		if err != nil {
+		} else if err != nil {
 			return nil, err
 		}
 
@@ -66,12 +79,13 @@ func (s CsvFileModelSource) Read() (Model, error) {
 }
 
 func (s CsvFileModelSource) Write(m Model) error {
-	f, err := os.Create(s.Filename)
+	f, err := os.Create(s.filename)
 	if err != nil {
 		return err
 	}
 
 	w := csv.NewWriter(f)
+	w.Comma = s.options.Comma
 
 	rows, cols := m.Dimensions()