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372 lines
11 KiB
Go
372 lines
11 KiB
Go
// Copyright 2012-2013 Apcera Inc. All rights reserved.
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package termtables
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import (
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"bytes"
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"os"
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"runtime"
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"strings"
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"github.com/goodrain/rainbond/util/termtables/term"
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)
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// MaxColumns represents the maximum number of columns that are available for
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// display without wrapping around the right-hand side of the terminal window.
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// At program initialization, the value will be automatically set according
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// to available sources of information, including the $COLUMNS environment
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// variable and, on Unix, tty information.
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var MaxColumns = 80
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// Element the interface that can draw a representation of the contents of a
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// table cell.
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type Element interface {
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Render(*renderStyle) string
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}
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type outputMode int
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const (
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outputTerminal outputMode = iota
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outputMarkdown
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outputHTML
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)
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// Open question: should UTF-8 become an output mode? It does require more
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// tracking when resetting, if the locale-enabling had been used.
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var outputsEnabled struct {
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UTF8 bool
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HTML bool
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Markdown bool
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titleStyle titleStyle
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}
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var defaultOutputMode outputMode = outputTerminal
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// Table represents a terminal table. The Style can be directly accessed
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// and manipulated; all other access is via methods.
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type Table struct {
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Style *TableStyle
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elements []Element
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headers []interface{}
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title interface{}
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titleCell *Cell
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outputMode outputMode
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}
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// EnableUTF8 will unconditionally enable using UTF-8 box-drawing characters
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// for any tables created after this call, as the default style.
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func EnableUTF8() {
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outputsEnabled.UTF8 = true
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}
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// SetModeHTML will control whether or not new tables generated will be in HTML
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// mode by default; HTML-or-not takes precedence over options which control how
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// a terminal output will be rendered, such as whether or not to use UTF8.
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// This affects any tables created after this call.
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func SetModeHTML(onoff bool) {
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outputsEnabled.HTML = onoff
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chooseDefaultOutput()
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}
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// SetModeMarkdown will control whether or not new tables generated will be
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// in Markdown mode by default. HTML-mode takes precedence.
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func SetModeMarkdown(onoff bool) {
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outputsEnabled.Markdown = onoff
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chooseDefaultOutput()
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}
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// EnableUTF8PerLocale will use current locale character map information to
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// determine if UTF-8 is expected and, if so, is equivalent to EnableUTF8.
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func EnableUTF8PerLocale() {
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locale := getLocale()
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if strings.Contains(locale, "UTF-8") {
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EnableUTF8()
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}
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}
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// getLocale returns the current locale name.
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func getLocale() string {
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if runtime.GOOS == "windows" {
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// TODO: detect windows locale
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return "US-ASCII"
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}
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return unixLocale()
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}
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// unixLocale returns the locale by checking the $LC_ALL, $LC_CTYPE, and $LANG
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// environment variables. If none of those are set, it returns "US-ASCII".
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func unixLocale() string {
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for _, env := range []string{"LC_ALL", "LC_CTYPE", "LANG"} {
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if locale := os.Getenv(env); locale != "" {
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return locale
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}
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}
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return "US-ASCII"
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}
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// SetHTMLStyleTitle lets an HTML title output mode be chosen.
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func SetHTMLStyleTitle(want titleStyle) {
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outputsEnabled.titleStyle = want
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}
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// chooseDefaultOutput sets defaultOutputMode based on priority
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// choosing amongst the options which are enabled. Pros: simpler
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// encapsulation; cons: setting markdown doesn't disable HTML if
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// HTML was previously enabled and was later disabled.
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// This seems fairly reasonable.
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func chooseDefaultOutput() {
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if outputsEnabled.HTML {
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defaultOutputMode = outputHTML
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} else if outputsEnabled.Markdown {
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defaultOutputMode = outputMarkdown
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} else {
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defaultOutputMode = outputTerminal
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}
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}
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func init() {
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// Do not enable UTF-8 per locale by default, breaks tests.
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sz, err := term.GetSize()
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if err == nil && sz.Columns != 0 {
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MaxColumns = sz.Columns
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}
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}
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// CreateTable creates an empty Table using defaults for style.
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func CreateTable() *Table {
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t := &Table{elements: []Element{}, Style: DefaultStyle}
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if outputsEnabled.UTF8 {
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t.Style.setUtfBoxStyle()
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}
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if outputsEnabled.titleStyle != titleStyle(0) {
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t.Style.htmlRules.title = outputsEnabled.titleStyle
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}
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t.outputMode = defaultOutputMode
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return t
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}
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// AddSeparator adds a line to the table content, where the line
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// consists of separator characters.
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func (t *Table) AddSeparator() {
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t.elements = append(t.elements, &Separator{})
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}
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// AddRow adds the supplied items as cells in one row of the table.
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func (t *Table) AddRow(items ...interface{}) *Row {
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row := CreateRow(items)
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t.elements = append(t.elements, row)
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return row
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}
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// AddTitle supplies a table title, which if present will be rendered as
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// one cell across the width of the table, as the first row.
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func (t *Table) AddTitle(title interface{}) {
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t.title = title
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}
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// AddHeaders supplies column headers for the table.
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func (t *Table) AddHeaders(headers ...interface{}) {
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t.headers = append(t.headers, headers...)
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}
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// SetAlign changes the alignment for elements in a column of the table;
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// alignments are stored with each cell, so cells added after a call to
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// SetAlign will not pick up the change. Columns are numbered from 1.
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func (t *Table) SetAlign(align tableAlignment, column int) {
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if column < 0 {
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return
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}
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for i := range t.elements {
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row, ok := t.elements[i].(*Row)
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if !ok {
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continue
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}
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if column >= len(row.cells) {
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continue
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}
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row.cells[column-1].alignment = &align
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}
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}
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// UTF8Box sets the table style to use UTF-8 box-drawing characters,
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// overriding all relevant style elements at the time of the call.
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func (t *Table) UTF8Box() {
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t.Style.setUtfBoxStyle()
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}
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// SetModeHTML switches this table to be in HTML when rendered; the
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// default depends upon whether the package function SetModeHTML() has been
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// called, and with what value. This method forces the feature on for this
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// table. Turning off involves choosing a different mode, per-table.
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func (t *Table) SetModeHTML() {
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t.outputMode = outputHTML
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}
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// SetModeMarkdown switches this table to be in Markdown mode
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func (t *Table) SetModeMarkdown() {
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t.outputMode = outputMarkdown
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}
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// SetModeTerminal switches this table to be in terminal mode.
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func (t *Table) SetModeTerminal() {
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t.outputMode = outputTerminal
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}
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// SetHTMLStyleTitle lets an HTML output mode be chosen; we should rework this
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// into a more generic and extensible API as we clean up termtables.
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func (t *Table) SetHTMLStyleTitle(want titleStyle) {
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t.Style.htmlRules.title = want
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}
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// Render returns a string representation of a fully rendered table, drawn
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// out for display, with embedded newlines. If this table is in HTML mode,
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// then this is equivalent to RenderHTML().
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func (t *Table) Render() string {
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// Elements is already populated with row data.
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switch t.outputMode {
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case outputTerminal:
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return t.renderTerminal()
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case outputMarkdown:
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return t.renderMarkdown()
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case outputHTML:
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return t.RenderHTML()
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default:
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panic("unknown output mode set")
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}
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}
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// renderTerminal returns a string representation of a fully rendered table,
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// drawn out for display, with embedded newlines.
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func (t *Table) renderTerminal() string {
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// Use a placeholder rather than adding titles/headers to the tables
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// elements or else successive calls will compound them.
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tt := t.clone()
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// Initial top line.
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if !tt.Style.SkipBorder {
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if tt.title != nil && tt.headers == nil {
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tt.elements = append([]Element{&Separator{where: LINE_SUBTOP}}, tt.elements...)
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} else if tt.title == nil && tt.headers == nil {
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tt.elements = append([]Element{&Separator{where: LINE_TOP}}, tt.elements...)
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} else {
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tt.elements = append([]Element{&Separator{where: LINE_INNER}}, tt.elements...)
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}
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}
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// If we have headers, include them.
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if tt.headers != nil {
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ne := make([]Element, 2)
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ne[1] = CreateRow(tt.headers)
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if tt.title != nil {
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ne[0] = &Separator{where: LINE_SUBTOP}
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} else {
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ne[0] = &Separator{where: LINE_TOP}
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}
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tt.elements = append(ne, tt.elements...)
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}
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// If we have a title, write it.
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if tt.title != nil {
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// Match changes to this into renderMarkdown too.
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tt.titleCell = CreateCell(tt.title, &CellStyle{Alignment: AlignCenter, ColSpan: 999})
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ne := []Element{
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&StraightSeparator{where: LINE_TOP},
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CreateRow([]interface{}{tt.titleCell}),
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}
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tt.elements = append(ne, tt.elements...)
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}
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// Create a new table from the
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// generate the runtime style. Must include all cells being printed.
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style := createRenderStyle(tt)
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// Loop over the elements and render them.
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b := bytes.NewBuffer(nil)
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for _, e := range tt.elements {
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b.WriteString(e.Render(style))
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b.WriteString("\n")
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}
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// Add bottom line.
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if !style.SkipBorder {
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b.WriteString((&Separator{where: LINE_BOTTOM}).Render(style) + "\n")
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}
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return b.String()
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}
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// renderMarkdown returns a string representation of a table in Markdown
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// markup format using GitHub Flavored Markdown's notation (since tables
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// are not in the core Markdown spec).
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func (t *Table) renderMarkdown() string {
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// We need ASCII drawing characters; we need a line after the header;
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// *do* need a header! Do not need to markdown-escape contents of
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// tables as markdown is ignored in there. Do need to do _something_
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// with a '|' character shown as a member of a table.
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t.Style.setAsciiBoxStyle()
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firstLines := make([]Element, 0, 2)
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if t.headers == nil {
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initial := createRenderStyle(t)
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if initial.columns > 1 {
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row := CreateRow([]interface{}{})
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for i := 0; i < initial.columns; i++ {
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row.AddCell(CreateCell(i+1, &CellStyle{}))
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}
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}
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}
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firstLines = append(firstLines, CreateRow(t.headers))
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// This is a dummy line, swapped out below.
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firstLines = append(firstLines, firstLines[0])
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t.elements = append(firstLines, t.elements...)
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// Generate the runtime style.
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style := createRenderStyle(t)
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// We know that the second line is a dummy, we can replace it.
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mdRow := CreateRow([]interface{}{})
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for i := 0; i < style.columns; i++ {
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mdRow.AddCell(CreateCell(strings.Repeat("-", style.cellWidths[i]), &CellStyle{}))
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}
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t.elements[1] = mdRow
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b := bytes.NewBuffer(nil)
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// Comes after style is generated, which must come after all width-affecting
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// changes are in.
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if t.title != nil {
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// Markdown doesn't support titles or column spanning; we _should_
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// escape the title, but doing that to handle all possible forms of
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// markup would require a heavy dependency, so we punt.
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b.WriteString("Table: ")
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b.WriteString(strings.TrimSpace(CreateCell(t.title, &CellStyle{}).Render(style)))
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b.WriteString("\n\n")
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}
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// Loop over the elements and render them.
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for _, e := range t.elements {
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b.WriteString(e.Render(style))
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b.WriteString("\n")
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}
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return b.String()
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}
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// clone returns a copy of the table with the underlying slices being copied;
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// the references to the Elements/cells are left as shallow copies.
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func (t *Table) clone() *Table {
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tt := &Table{outputMode: t.outputMode, Style: t.Style, title: t.title}
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if t.headers != nil {
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tt.headers = make([]interface{}, len(t.headers))
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copy(tt.headers, t.headers)
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}
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if t.elements != nil {
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tt.elements = make([]Element, len(t.elements))
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copy(tt.elements, t.elements)
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}
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return tt
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}
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