Merge pull request #12 from nineinchnick/auto-expand

Auto expand if width is greater than screen

encode.go

@@ -46,6 +46,9 @@ type TableEncoder struct {
 	// summary is the summary map.
 	summary map[int]func(io.Writer, int) (int, error)
 
+	// isCustomSummary when summary has been set via options
+	isCustomSummary bool
+
 	// title is the title value.
 	title *Value
 
@@ -65,6 +68,10 @@ type TableEncoder struct {
 	// They are at least as wide as user-supplied widths
 	maxWidths []int
 
+	// maxWidth of whole table, before switching to the ExpandedEncoder,
+	// zero disables switching
+	maxWidth int
+
 	// scanCount is the number of scanned results in the result set.
 	scanCount int
 
@@ -170,29 +177,36 @@ func (enc *TableEncoder) Encode(w io.Writer) error {
 
 		enc.calcWidth(vals)
 
+		if enc.maxWidth != 0 && enc.tableWidth() > enc.maxWidth {
+			t := *enc
+			t.formatter = NewEscapeFormatter()
+			exp := ExpandedEncoder{
+				TableEncoder: t,
+			}
+			exp.offsets = make([]int, 2)
+			exp.maxWidths = make([]int, 2)
+			exp.calcWidth(vals)
+
+			if err := exp.encodeVals(vals); err != nil {
+				return nil
+			}
+			continue
+		}
+
 		// print header if not already done
 		if !wroteHeader {
 			wroteHeader = true
-
 			enc.header()
 		}
 
-		rs := enc.rowStyle(enc.lineStyle.Row)
-		// print buffered vals
-		for i := 0; i < len(vals); i++ {
-			enc.row(vals[i], rs)
-			if i+1%1000 == 0 {
-				// check error every 1k rows
-				if err := enc.w.Flush(); err != nil {
-					return err
-				}
-			}
+		if err := enc.encodeVals(vals); err != nil {
+			return err
 		}
-	}
 
-	// draw end border
-	if enc.border >= 2 {
-		enc.divider(enc.rowStyle(enc.lineStyle.End))
+		// draw end border
+		if enc.border >= 2 {
+			enc.divider(enc.rowStyle(enc.lineStyle.End))
+		}
 	}
 
 	// add summary
@@ -202,6 +216,22 @@ func (enc *TableEncoder) Encode(w io.Writer) error {
 	return enc.w.Flush()
 }
 
+func (enc *TableEncoder) encodeVals(vals [][]*Value) error {
+	rs := enc.rowStyle(enc.lineStyle.Row)
+	// print buffered vals
+	for i := 0; i < len(vals); i++ {
+		enc.row(vals[i], rs)
+		if i+1%1000 == 0 {
+			// check error every 1k rows
+			if err := enc.w.Flush(); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 // EncodeAll encodes all result sets to the writer using the encoder settings.
 func (enc *TableEncoder) EncodeAll(w io.Writer) error {
 	var err error
@@ -518,6 +548,9 @@ func (enc *TableEncoder) writeAligned(b, filler []byte, a Align, width, max int)
 // summarize writes the table scan count summary.
 func (enc *TableEncoder) summarize(w io.Writer) {
 	// do summary
+	if enc.summary == nil {
+		return
+	}
 	var f func(io.Writer, int) (int, error)
 	if z, ok := enc.summary[-1]; ok {
 		f = z
@@ -544,6 +577,9 @@ func NewExpandedEncoder(resultSet ResultSet, opts ...Option) (Encoder, error) {
 	}
 	t := tableEnc.(*TableEncoder)
 	t.formatter = NewEscapeFormatter()
+	if !t.isCustomSummary {
+		t.summary = nil
+	}
 
 	enc := &ExpandedEncoder{
 		TableEncoder: *t,
@@ -601,8 +637,6 @@ func (enc *ExpandedEncoder) Encode(w io.Writer) error {
 
 		enc.calcWidth(vals)
 
-		rs := enc.rowStyle(enc.lineStyle.Row)
-
 		// print title if not already done
 		if !wroteTitle && enc.title != nil {
 			wroteTitle = true
@@ -611,14 +645,27 @@ func (enc *ExpandedEncoder) Encode(w io.Writer) error {
 			enc.w.Write(enc.newline)
 		}
 
-		// print buffered vals
-		for i := 0; i < len(vals); i++ {
-			enc.record(i, vals[i], rs)
-			if i+1%1000 == 0 {
-				// check error every 1k rows
-				if err := enc.w.Flush(); err != nil {
-					return err
-				}
+		if err := enc.encodeVals(vals); err != nil {
+			return err
+		}
+	}
+
+	// add summary
+	enc.summarize(w)
+
+	// flush will return the error code
+	return enc.w.Flush()
+}
+
+func (enc *ExpandedEncoder) encodeVals(vals [][]*Value) error {
+	rs := enc.rowStyle(enc.lineStyle.Row)
+	// print buffered vals
+	for i := 0; i < len(vals); i++ {
+		enc.record(i, vals[i], rs)
+		if i+1%1000 == 0 {
+			// check error every 1k rows
+			if err := enc.w.Flush(); err != nil {
+				return err
 			}
 		}
 	}
@@ -627,9 +674,7 @@ func (enc *ExpandedEncoder) Encode(w io.Writer) error {
 	if enc.border >= 2 && enc.scanCount != 0 {
 		enc.divider(enc.rowStyle(enc.lineStyle.End))
 	}
-
-	// flush will return the error code
-	return enc.w.Flush()
+	return nil
 }
 
 // EncodeAll encodes all result sets to the writer using the encoder settings.

go.mod

@@ -1,5 +1,8 @@
 module github.com/xo/tblfmt
 
-require github.com/mattn/go-runewidth v0.0.9
+require (
+	github.com/mattn/go-runewidth v0.0.9
+	github.com/nathan-fiscaletti/consolesize-go v0.0.0-20210105204122-a87d9f614b9d
+)
 
 go 1.13

go.sum

@@ -1,2 +1,4 @@
 github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/nathan-fiscaletti/consolesize-go v0.0.0-20210105204122-a87d9f614b9d h1:PQW4Aqovdqc9efHl9EVA+bhKmuZ4ME1HvSYYDvaDiK0=
+github.com/nathan-fiscaletti/consolesize-go v0.0.0-20210105204122-a87d9f614b9d/go.mod h1:cxIIfNMTwff8f/ZvRouvWYF6wOoO7nj99neWSx2q/Es=

opts.go

@@ -4,6 +4,8 @@ import (
 	"io"
 	"strconv"
 	"unicode/utf8"
+
+	"github.com/nathan-fiscaletti/consolesize-go"
 )
 
 // Builder is the shared builder interface.
@@ -69,7 +71,8 @@ func FromMap(opts map[string]string) (Builder, []Option) {
 		if e, ok := opts["expanded"]; ok {
 			switch e {
 			case "auto":
-				fallthrough
+				cols, _ := consolesize.GetConsoleSize()
+				tableOpts = append(tableOpts, WithMaxWidth(cols))
 			case "on":
 				builder = NewExpandedEncoder
 			}
@@ -126,6 +129,7 @@ func WithSummary(summary map[int]func(io.Writer, int) (int, error)) Option {
 		switch enc := v.(type) {
 		case *TableEncoder:
 			enc.summary = summary
+			enc.isCustomSummary = true
 		}
 		return nil
 	}
@@ -195,6 +199,19 @@ func WithWidths(widths []int) Option {
 	}
 }
 
+// WithMaxWidth is a encoder option to set maximum width before switching to expanded format.
+func WithMaxWidth(w int) Option {
+	return func(v interface{}) error {
+		switch enc := v.(type) {
+		case *TableEncoder:
+			enc.maxWidth = w
+		case *ExpandedEncoder:
+			enc.maxWidth = w
+		}
+		return nil
+	}
+}
+
 // WithNewline is a encoder option to set the newline.
 func WithNewline(newline string) Option {
 	return func(v interface{}) error {

tblfmt_test.go

@@ -235,6 +235,20 @@ func TestTinyAligned(t *testing.T) {
 	}
 }
 
+func TestWideExpanded(t *testing.T) {
+	resultSet := rswide()
+	buf := new(bytes.Buffer)
+	params := map[string]string{
+		"format":   "aligned",
+		"expanded": "auto",
+		"border":   "2",
+	}
+	if err := EncodeAll(buf, resultSet, params); err != nil {
+		t.Fatalf("expected no error when encoding, got: %v", err)
+	}
+	t.Log("\n", newlineRE.ReplaceAllString(buf.String(), "\t"))
+}
+
 func TestBigAligned(t *testing.T) {
 	resultSet := rsbig()
 

util_test.go

@@ -150,6 +150,28 @@ func rstiny() *rset {
 	}
 }
 
+func rswide() *rset {
+	return &rset{
+		cols: []string{
+			"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+			"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+			"cccccccccccccccccccccccccccccc",
+			"dddddddddddddddddddddddddddddd",
+			"eeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
+			"ffffffffffffffffffffffffffffff",
+			"gggggggggggggggggggggggggggggg",
+			"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhh",
+			"iiiiiiiiiiiiiiiiiiiiiiiiiiiiii",
+			"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjj",
+		},
+		vals: [][][]interface{}{
+			{
+				{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"},
+			},
+		},
+	}
+}
+
 // rsset returns a predefined set of records for rs.
 func rsset(i int) [][]interface{} {
 	return [][]interface{}{