table: ColumnConfig.WidthMaxEnforcer to customize WidthMax impl; fixes …

…#98

table/config.go

@@ -50,8 +50,21 @@ type ColumnConfig struct {
 	// VAlignHeader defines the vertical alignment in Header rows
 	VAlignHeader text.VAlign
 
-	// WidthMin defines the minimum character length of the column
-	WidthMin int
 	// WidthMax defines the maximum character length of the column
 	WidthMax int
+	// WidthEnforcer enforces the WidthMax value on the column contents;
+	// default: text.WrapText
+	WidthMaxEnforcer WidthEnforcer
+	// WidthMin defines the minimum character length of the column
+	WidthMin int
+}
+
+func (c ColumnConfig) getWidthMaxEnforcer() WidthEnforcer {
+	if c.WidthMax == 0 {
+		return widthEnforcerNone
+	}
+	if c.WidthMaxEnforcer != nil {
+		return c.WidthMaxEnforcer
+	}
+	return text.WrapText
 }

table/config_test.go

@@ -0,0 +1,68 @@
+package table
+
+import (
+	"testing"
+
+	"github.com/jedib0t/go-pretty/text"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestColumnConfig_getWidthMaxEnforcer(t *testing.T) {
+	t.Run("no width enforcer", func(t *testing.T) {
+		cc := ColumnConfig{}
+
+		widthEnforcer := cc.getWidthMaxEnforcer()
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 0))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 1))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 5))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 10))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 100))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 1000))
+	})
+
+	t.Run("default width enforcer", func(t *testing.T) {
+		cc := ColumnConfig{
+			WidthMax: 10,
+		}
+
+		widthEnforcer := cc.getWidthMaxEnforcer()
+		assert.Equal(t, "", widthEnforcer("1234567890", 0))
+		assert.Equal(t, "1\n2\n3\n4\n5\n6\n7\n8\n9\n0", widthEnforcer("1234567890", 1))
+		assert.Equal(t, "12345\n67890", widthEnforcer("1234567890", 5))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 10))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 100))
+		assert.Equal(t, "1234567890", widthEnforcer("1234567890", 1000))
+	})
+
+	t.Run("custom width enforcer (1)", func(t *testing.T) {
+		cc := ColumnConfig{
+			WidthMax:         10,
+			WidthMaxEnforcer: text.Trim,
+		}
+
+		widthEnforcer := cc.getWidthMaxEnforcer()
+		assert.Equal(t, text.Trim("1234567890", 0), widthEnforcer("1234567890", 0))
+		assert.Equal(t, text.Trim("1234567890", 1), widthEnforcer("1234567890", 1))
+		assert.Equal(t, text.Trim("1234567890", 5), widthEnforcer("1234567890", 5))
+		assert.Equal(t, text.Trim("1234567890", 10), widthEnforcer("1234567890", 10))
+		assert.Equal(t, text.Trim("1234567890", 100), widthEnforcer("1234567890", 100))
+		assert.Equal(t, text.Trim("1234567890", 1000), widthEnforcer("1234567890", 1000))
+	})
+
+	t.Run("custom width enforcer (2)", func(t *testing.T) {
+		cc := ColumnConfig{
+			WidthMax: 10,
+			WidthMaxEnforcer: func(col string, maxLen int) string {
+				return "foo"
+			},
+		}
+
+		widthEnforcer := cc.getWidthMaxEnforcer()
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 0))
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 1))
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 5))
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 10))
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 100))
+		assert.Equal(t, "foo", widthEnforcer("1234567890", 1000))
+	})
+}

table/render.go

@@ -260,7 +260,8 @@ func (t *Table) renderRow(out *strings.Builder, rowNum int, row rowStr, hint ren
 		colMaxLines := 0
 		rowWrapped := make(rowStr, len(row))
 		for colIdx, colStr := range row {
-			rowWrapped[colIdx] = text.WrapText(colStr, t.maxColumnLengths[colIdx])
+			widthEnforcer := t.columnConfigMap[colIdx].getWidthMaxEnforcer()
+			rowWrapped[colIdx] = widthEnforcer(colStr, t.maxColumnLengths[colIdx])
 			colNumLines := strings.Count(rowWrapped[colIdx], "\n") + 1
 			if colNumLines > colMaxLines {
 				colMaxLines = colNumLines

table/render_test.go

@@ -2,7 +2,6 @@ package table
 
 import (
 	"fmt"
-	"os"
 	"sort"
 	"strings"
 	"testing"
@@ -72,7 +71,6 @@ func TestTable_Render(t *testing.T) {
 [<   >|<          >|<TOTAL    >|< 10000>|<                           >]
 \-----v------------v-----------v--------v-----------------------------/
 A Song of Ice and Fire`
-	fmt.Println(tw.Render())
 	assert.Equal(t, expectedOut, tw.Render())
 }
 
@@ -233,7 +231,6 @@ func TestTable_Render_Colored(t *testing.T) {
 	tw.Style().Options.SeparateFooter = true
 	tw.Style().Options.SeparateHeader = true
 	tw.Style().Options.SeparateRows = true
-	tw.SetOutputMirror(os.Stdout)
 
 	expectedOut := []string{
 		"\x1b[106;30m+\x1b[0m\x1b[106;30m---\x1b[0m\x1b[106;30m+\x1b[0m\x1b[106;30m-----\x1b[0m\x1b[106;30m+\x1b[0m\x1b[106;30m------------\x1b[0m\x1b[106;30m+\x1b[0m\x1b[106;30m-----------\x1b[0m\x1b[106;30m+\x1b[0m\x1b[106;30m--------\x1b[0m\x1b[106;30m+\x1b[0m\x1b[106;30m-----------------------------\x1b[0m\x1b[106;30m+\x1b[0m",
@@ -398,7 +395,6 @@ func TestTable_Render_ColoredStyleAutoIndex(t *testing.T) {
 		"\x1b[36;100m   \x1b[0m\x1b[36;100m     \x1b[0m\x1b[36;100m            \x1b[0m\x1b[36;100m TOTAL     \x1b[0m\x1b[36;100m  10000 \x1b[0m\x1b[36;100m                             \x1b[0m",
 	}, "\n")
 	out := table.Render()
-	fmt.Println(out)
 	assert.Equal(t, expectedOut, out)
 
 	// dump it out in a easy way to update the test if things are meant to

table/util.go

@@ -1,6 +1,8 @@
 package table
 
-import "reflect"
+import (
+	"reflect"
+)
 
 // AutoIndexColumnID returns a unique Column ID/Name for the given Column Number.
 // The functionality is similar to what you get in an Excel spreadsheet w.r.t.
@@ -25,3 +27,11 @@ func isNumber(x interface{}) bool {
 	}
 	return false
 }
+
+// WidthEnforcer is a function that helps enforce a width condition on a string.
+type WidthEnforcer func(col string, maxLen int) string
+
+// widthEnforcerNone returns the input string as is without any modifications.
+func widthEnforcerNone(col string, maxLen int) string {
+	return col
+}