Add docs

bar.go

@@ -6,6 +6,20 @@ package termui
 
 import "fmt"
 
+// BarChart creates multiple bars in a widget:
+/*
+   bc := termui.NewBarChart()
+   data := []int{3, 2, 5, 3, 9, 5}
+   bclabels := []string{"S0", "S1", "S2", "S3", "S4", "S5"}
+   bc.Border.Label = "Bar Chart"
+   bc.Data = data
+   bc.Width = 26
+   bc.Height = 10
+   bc.DataLabels = bclabels
+   bc.TextColor = termui.ColorGreen
+   bc.BarColor = termui.ColorRed
+   bc.NumColor = termui.ColorYellow
+*/
 type BarChart struct {
 	Block
 	BarColor   Attribute
@@ -22,6 +36,7 @@ type BarChart struct {
 	max        int
 }
 
+// NewBarChart returns a new *BarChart with current theme.
 func NewBarChart() *BarChart {
 	bc := &BarChart{Block: *NewBlock()}
 	bc.BarColor = theme.BarChartBar
@@ -53,6 +68,7 @@ func (bc *BarChart) layout() {
 	bc.scale = float64(bc.max) / float64(bc.innerHeight-1)
 }
 
+// Buffer implements Bufferer interface.
 func (bc *BarChart) Buffer() []Point {
 	ps := bc.Block.Buffer()
 	bc.layout()

block.go

@@ -4,7 +4,9 @@
 
 package termui
 
-// basic struct, consider it as css: display:block
+// Block is a base struct for all other upper level widgets,
+// consider it as css: display:block.
+// Normally you do not need to create it manually.
 type Block struct {
 	X             int
 	Y             int
@@ -24,6 +26,7 @@ type Block struct {
 	PaddingRight  int
 }
 
+// NewBlock returns a *Block which inherits styles from current theme.
 func NewBlock() *Block {
 	d := Block{}
 	d.IsDisplay = true
@@ -52,11 +55,13 @@ func (d *Block) align() {
 		d.Border.Y = d.Y
 		d.Border.Width = d.Width
 		d.Border.Height = d.Height
-		d.innerX += 1
+		d.innerX++
-		d.innerY += 1
+		d.innerY++
 	}
 }
 
+// Buffer implements Bufferer interface.
+// Draw background and border (if any).
 func (d *Block) Buffer() []Point {
 	d.align()
 
@@ -82,22 +87,23 @@ func (d *Block) Buffer() []Point {
 	return ps
 }
 
+// GetHeight implements GridBufferer.
+// It returns current height of the block.
 func (d Block) GetHeight() int {
 	return d.Height
 }
 
-func (d Block) GetWidth() int {
+// SetX implements GridBufferer interface, which sets block's x position.
-	return d.Width
-}
-
 func (d *Block) SetX(x int) {
 	d.X = x
 }
 
+// SetY implements GridBufferer interface, it sets y position for block.
 func (d *Block) SetY(y int) {
 	d.Y = y
 }
 
+// SetWidth implements GridBuffer interface, it sets block's width.
 func (d *Block) SetWidth(w int) {
 	d.Width = w
 }

box.go

@@ -29,6 +29,7 @@ type vline struct {
 	BgColor Attribute
 }
 
+// Draw a horizontal line.
 func (l hline) Buffer() []Point {
 	pts := make([]Point, l.Length)
 	for i := 0; i < l.Length; i++ {
@@ -41,6 +42,7 @@ func (l hline) Buffer() []Point {
 	return pts
 }
 
+// Draw a vertical line.
 func (l vline) Buffer() []Point {
 	pts := make([]Point, l.Length)
 	for i := 0; i < l.Length; i++ {
@@ -53,6 +55,7 @@ func (l vline) Buffer() []Point {
 	return pts
 }
 
+// Draw a box border.
 func (b border) Buffer() []Point {
 	if b.Width < 2 || b.Height < 2 {
 		return nil
@@ -98,6 +101,7 @@ type labeledBorder struct {
 	LabelBgColor Attribute
 }
 
+// Draw a box border with label.
 func (lb labeledBorder) Buffer() []Point {
 	ps := lb.border.Buffer()
 	maxTxtW := lb.Width - 2

chart.go

@@ -32,8 +32,18 @@ var braillePatterns = map[[2]int]rune{
 var lSingleBraille = [4]rune{'\u2840', '⠄', '⠂', '⠁'}
 var rSingleBraille = [4]rune{'\u2880', '⠠', '⠐', '⠈'}
 
-//var singleBraille = [4]rune{'⣀', '⠤', '⠒', '⠉'}
+// LineChart has two modes: braille(default) and dot. Using braille gives 2x capicity as dot mode,
-
+// because one braille char can represent two data points.
+/*
+  lc := termui.NewLineChart()
+  lc.Border.Label = "braille-mode Line Chart"
+  lc.Data = [1.2, 1.3, 1.5, 1.7, 1.5, 1.6, 1.8, 2.0]
+  lc.Width = 50
+  lc.Height = 12
+  lc.AxesColor = termui.ColorWhite
+  lc.LineColor = termui.ColorGreen | termui.AttrBold
+  // termui.Render(lc)...
+*/
 type LineChart struct {
 	Block
 	Data          []float64
@@ -58,6 +68,7 @@ type LineChart struct {
 	minY          float64
 }
 
+// NewLineChart returns a new LineChart with current theme.
 func NewLineChart() *LineChart {
 	lc := &LineChart{Block: *NewBlock()}
 	lc.AxesColor = theme.LineChartAxes
@@ -298,6 +309,7 @@ func (lc *LineChart) plotAxes() []Point {
 	return ps
 }
 
+// Buffer implements Bufferer interface.
 func (lc *LineChart) Buffer() []Point {
 	ps := lc.Block.Buffer()
 	if lc.Data == nil || len(lc.Data) == 0 {

doc.go

@@ -0,0 +1,27 @@
+// Copyright 2015 Zack Guo <gizak@icloud.com>. All rights reserved.
+// Use of this source code is governed by a MIT license that can
+// be found in the LICENSE file.
+
+/*
+Package termui is a library designed for creating command line UI. For more info, goto http://github.com/gizak/termui
+
+A simplest example:
+    package main
+
+    import ui "github.com/gizak/termui"
+
+    func main() {
+        if err:=ui.Init(); err != nil {
+            panic(err)
+        }
+        defer ui.Close()
+
+        g := ui.NewGauge()
+        g.Percent = 50
+        g.Width = 50
+        g.Border.Label = "Gauge"
+
+        ui.Render(g)
+    }
+*/
+package termui

gauge.go

@@ -6,6 +6,17 @@ package termui
 
 import "strconv"
 
+// Gauge is a progress bar like widget.
+// A simple example:
+/*
+  g := termui.NewGauge()
+  g.Percent = 40
+  g.Width = 50
+  g.Height = 3
+  g.Border.Label = "Slim Gauge"
+  g.BarColor = termui.ColorRed
+  g.PercentColor = termui.ColorBlue
+*/
 type Gauge struct {
 	Block
 	Percent      int
@@ -13,6 +24,7 @@ type Gauge struct {
 	PercentColor Attribute
 }
 
+// NewGauge return a new gauge with current theme.
 func NewGauge() *Gauge {
 	g := &Gauge{
 		Block:        *NewBlock(),
@@ -23,6 +35,7 @@ func NewGauge() *Gauge {
 	return g
 }
 
+// Buffer implements Bufferer interface.
 func (g *Gauge) Buffer() []Point {
 	ps := g.Block.Buffer()
 

grid.go

@@ -4,8 +4,8 @@
 
 package termui
 
-// Bufferers that can be manipulated by Grid
+// GridBufferer introduces a Bufferer that can be manipulated by Grid.
-type LayoutBufferer interface {
+type GridBufferer interface {
 	Bufferer
 	GetHeight() int
 	SetWidth(int)
@@ -13,10 +13,10 @@ type LayoutBufferer interface {
 	SetY(int)
 }
 
-// build a layout tree
+// row builds a layout tree
 type row struct {
-	Cols   []*row         //children
+	Cols   []*row       //children
-	Widget LayoutBufferer // root
+	Widget GridBufferer // root
 	X      int
 	Y      int
 	Width  int
@@ -25,6 +25,7 @@ type row struct {
 	Offset int
 }
 
+// calculate and set the underlying layout tree's x, y, height and width.
 func (r *row) calcLayout() {
 	r.assignWidth(r.Width)
 	r.Height = r.solveHeight()
@@ -32,6 +33,7 @@ func (r *row) calcLayout() {
 	r.assignY(r.Y)
 }
 
+// tell if the node is leaf in the tree.
 func (r *row) isLeaf() bool {
 	return r.Cols == nil || len(r.Cols) == 0
 }
@@ -40,16 +42,18 @@ func (r *row) isRenderableLeaf() bool {
 	return r.isLeaf() && r.Widget != nil
 }
 
+// assign widgets' (and their parent rows') width recursively.
 func (r *row) assignWidth(w int) {
 	cw := int(float64(w*r.Span) / 12)
 	r.SetWidth(cw)
 
-	for i, _ := range r.Cols {
+	for i := range r.Cols {
 		r.Cols[i].assignWidth(cw)
 	}
 }
 
-// bottom up, return r's total height
+// bottom up calc and set rows' (and their widgets') height,
+// return r's total height.
 func (r *row) solveHeight() int {
 	if r.isRenderableLeaf() {
 		r.Height = r.Widget.GetHeight()
@@ -74,6 +78,7 @@ func (r *row) solveHeight() int {
 	return maxh
 }
 
+// recursively assign x position for r tree.
 func (r *row) assignX(x int) {
 	r.SetX(x)
 
@@ -89,6 +94,7 @@ func (r *row) assignX(x int) {
 	}
 }
 
+// recursively assign y position to r.
 func (r *row) assignY(y int) {
 	r.SetY(y)
 
@@ -106,10 +112,12 @@ func (r *row) assignY(y int) {
 
 }
 
+// GetHeight implements GridBufferer interface.
 func (r row) GetHeight() int {
 	return r.Height
 }
 
+// SetX implements GridBufferer interface.
 func (r *row) SetX(x int) {
 	r.X = x
 	if r.Widget != nil {
@@ -117,6 +125,7 @@ func (r *row) SetX(x int) {
 	}
 }
 
+// SetY implements GridBufferer interface.
 func (r *row) SetY(y int) {
 	r.Y = y
 	if r.Widget != nil {
@@ -124,6 +133,7 @@ func (r *row) SetY(y int) {
 	}
 }
 
+// SetWidth implements GridBufferer interface.
 func (r *row) SetWidth(w int) {
 	r.Width = w
 	if r.Widget != nil {
@@ -131,6 +141,7 @@ func (r *row) SetWidth(w int) {
 	}
 }
 
+// Buffer implements Bufferer interface,
 // recursively merge all widgets buffer
 func (r *row) Buffer() []Point {
 	merged := []Point{}
@@ -154,6 +165,27 @@ func (r *row) Buffer() []Point {
 	return merged
 }
 
+// Grid implements 12 columns system.
+// A simple example:
+/*
+   import ui "github.com/gizak/termui"
+   // init and create widgets...
+
+   // build
+   ui.Body.AddRows(
+       ui.NewRow(
+           ui.NewCol(6, 0, widget0),
+           ui.NewCol(6, 0, widget1)),
+       ui.NewRow(
+           ui.NewCol(3, 0, widget2),
+           ui.NewCol(3, 0, widget30, widget31, widget32),
+           ui.NewCol(6, 0, widget4)))
+
+   // calculate layout
+   ui.Body.Align()
+
+   ui.Render(ui.Body)
+*/
 type Grid struct {
 	Rows    []*row
 	Width   int
@@ -162,23 +194,25 @@ type Grid struct {
 	BgColor Attribute
 }
 
+// NewGrid returns *Grid with given rows.
 func NewGrid(rows ...*row) *Grid {
 	return &Grid{Rows: rows}
 }
 
+// AddRows appends given rows to Grid.
 func (g *Grid) AddRows(rs ...*row) {
 	g.Rows = append(g.Rows, rs...)
 }
 
+// NewRow creates a new row out of given columns.
 func NewRow(cols ...*row) *row {
 	rs := &row{Span: 12, Cols: cols}
 	return rs
 }
 
-// NewCol accepts: widgets are LayoutBufferer or
+// NewCol accepts: widgets are LayoutBufferer or widgets is A NewRow.
-//                 widgets is A NewRow
+// Note that if multiple widgets are provided, they will stack up in the col.
-// Note that if multiple widgets are provided, they will stack up in the col
+func NewCol(span, offset int, widgets ...GridBufferer) *row {
-func NewCol(span, offset int, widgets ...LayoutBufferer) *row {
 	r := &row{Span: span, Offset: offset}
 
 	if widgets != nil && len(widgets) == 1 {
@@ -203,7 +237,7 @@ func NewCol(span, offset int, widgets ...LayoutBufferer) *row {
 	return r
 }
 
-// Calculate each rows' layout
+// Align calculate each rows' layout.
 func (g *Grid) Align() {
 	h := 0
 	for _, r := range g.Rows {
@@ -215,6 +249,7 @@ func (g *Grid) Align() {
 	}
 }
 
+// Buffer implments Bufferer interface.
 func (g Grid) Buffer() []Point {
 	ps := []Point{}
 	for _, r := range g.Rows {
@@ -223,4 +258,5 @@ func (g Grid) Buffer() []Point {
 	return ps
 }
 
+// Body corresponds to the entire terminal display region.
 var Body *Grid

list.go

@@ -6,6 +6,29 @@ package termui
 
 import "strings"
 
+// List displays []string as its items,
+// it has a Overflow option (default is "hidden"), when set to "hidden",
+// the item exceeding List's width is truncated, but when set to "wrap",
+// the overflowed text breaks into next line.
+/*
+  strs := []string{
+		"[0] github.com/gizak/termui",
+		"[1] editbox.go",
+		"[2] iterrupt.go",
+		"[3] keyboard.go",
+		"[4] output.go",
+		"[5] random_out.go",
+		"[6] dashboard.go",
+		"[7] nsf/termbox-go"}
+
+  ls := termui.NewList()
+  ls.Items = strs
+  ls.ItemFgColor = termui.ColorYellow
+  ls.Border.Label = "List"
+  ls.Height = 7
+  ls.Width = 25
+  ls.Y = 0
+*/
 type List struct {
 	Block
 	Items       []string
@@ -14,6 +37,7 @@ type List struct {
 	ItemBgColor Attribute
 }
 
+// NewList returns a new *List with current theme.
 func NewList() *List {
 	l := &List{Block: *NewBlock()}
 	l.Overflow = "hidden"
@@ -22,6 +46,7 @@ func NewList() *List {
 	return l
 }
 
+// Buffer implements Bufferer interface.
 func (l *List) Buffer() []Point {
 	ps := l.Block.Buffer()
 	switch l.Overflow {

p.go

@@ -4,6 +4,13 @@
 
 package termui
 
+// Par displays a paragraph.
+/*
+  par := termui.NewPar("Simple Text")
+  par.Height = 3
+  par.Width = 17
+  par.Border.Label = "Label"
+*/
 type Par struct {
 	Block
 	Text        string
@@ -11,6 +18,7 @@ type Par struct {
 	TextBgColor Attribute
 }
 
+// NewPar returns a new *Par with given text as its content.
 func NewPar(s string) *Par {
 	return &Par{
 		Block:       *NewBlock(),
@@ -19,6 +27,7 @@ func NewPar(s string) *Par {
 		TextBgColor: theme.ParTextBg}
 }
 
+// Buffer implements Bufferer interface.
 func (p *Par) Buffer() []Point {
 	ps := p.Block.Buffer()
 

point.go

@@ -4,6 +4,7 @@
 
 package termui
 
+// Point stands for a single cell in terminal.
 type Point struct {
 	Ch rune
 	Bg Attribute

render.go

@@ -6,11 +6,13 @@ package termui
 
 import tm "github.com/nsf/termbox-go"
 
-// all renderable components should implement this
+// Bufferer should be implemented by all renderable components.
 type Bufferer interface {
 	Buffer() []Point
 }
 
+// Init initializes termui library. This function should be called before any others.
+// After initialization, the library must be finalized by 'Close' function.
 func Init() error {
 	Body = NewGrid()
 	Body.X = 0
@@ -23,21 +25,26 @@ func Init() error {
 	return tm.Init()
 }
 
+// Close finalizes termui library,
+// should be called after successful initialization when termui's functionality isn't required anymore.
 func Close() {
 	tm.Close()
 }
 
+// TermWidth returns the current terminal's width.
 func TermWidth() int {
 	w, _ := tm.Size()
 	return w
 }
 
+// TermHeight returns the current terminal's height.
 func TermHeight() int {
 	_, h := tm.Size()
 	return h
 }
 
-// render all from left to right, right could overlap on left ones
+// Render renders all Bufferer in the given order from left to right,
+// right could overlap on left ones.
 func Render(rs ...Bufferer) {
 	tm.Clear(tm.ColorDefault, toTmAttr(theme.BodyBg))
 	for _, r := range rs {

sparkline.go

@@ -6,6 +6,14 @@ package termui
 
 import "math"
 
+// Sparkline is like: ▅▆▂▂▅▇▂▂▃▆▆▆▅▃
+/*
+  data := []int{4, 2, 1, 6, 3, 9, 1, 4, 2, 15, 14, 9, 8, 6, 10, 13, 15, 12, 10, 5, 3, 6, 1}
+  spl := termui.NewSparkline()
+  spl.Data = data
+  spl.Title = "Sparkline 0"
+  spl.LineColor = termui.ColorGreen
+*/
 type Sparkline struct {
 	Data          []int
 	Height        int
@@ -17,6 +25,12 @@ type Sparkline struct {
 	max           int
 }
 
+// Sparklines is a renderable widget which groups together the given sparklines.
+/*
+  spls := termui.NewSparklines(spl0,spl1,spl2) //...
+  spls.Height = 2
+  spls.Width = 20
+*/
 type Sparklines struct {
 	Block
 	Lines        []Sparkline
@@ -26,11 +40,12 @@ type Sparklines struct {
 
 var sparks = []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
 
+// Add appends a given Sparkline to s *Sparklines.
 func (s *Sparklines) Add(sl Sparkline) {
 	s.Lines = append(s.Lines, sl)
 }
 
-// return unrenderable single sparkline, need to add it into Sparklines
+// NewSparkline returns a unrenderable single sparkline that intended to be added into Sparklines.
 func NewSparkline() Sparkline {
 	return Sparkline{
 		Height:     1,
@@ -38,6 +53,7 @@ func NewSparkline() Sparkline {
 		LineColor:  theme.SparklineLine}
 }
 
+// NewSparklines return a new *Spaklines with given Sparkline(s), you can always add a new Sparkline later.
 func NewSparklines(ss ...Sparkline) *Sparklines {
 	s := &Sparklines{Block: *NewBlock(), Lines: ss}
 	return s
@@ -79,6 +95,7 @@ func (sl *Sparklines) update() {
 	}
 }
 
+// Buffer implements Bufferer interface.
 func (sl *Sparklines) Buffer() []Point {
 	ps := sl.Block.Buffer()
 	sl.update()