536 lines
12 KiB
Go
536 lines
12 KiB
Go
package d2term
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import (
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"errors"
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"fmt"
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"image/color"
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"log"
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"math"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"github.com/OpenDiablo2/OpenDiablo2/d2common"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
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)
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// TermCategory applies styles to the lines in the Terminal
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type TermCategory d2interface.TermCategory
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// Terminal Category types
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const (
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TermCategoryNone = TermCategory(d2interface.TermCategoryNone)
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TermCategoryInfo = TermCategory(d2interface.TermCategoryInfo)
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TermCategoryWarning = TermCategory(d2interface.TermCategoryWarning)
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TermCategoryError = TermCategory(d2interface.TermCategoryError)
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)
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const (
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termCharWidth = 6
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termCharHeight = 16
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termRowCount = 24
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termRowCountMax = 32
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termColCountMax = 128
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termAnimLength = 0.5
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)
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type termVis int
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const (
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termVisHidden termVis = iota
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termVisShowing
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termVisShown
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termVisHiding
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)
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const (
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maxVisAnim = 1.0
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minVisAnim = 0.0
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)
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type termHistoryEntry struct {
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text string
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category d2interface.TermCategory
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}
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type termActionEntry struct {
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action interface{}
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description string
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}
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type terminal struct {
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outputHistory []termHistoryEntry
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outputIndex int
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command string
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commandHistory []string
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commandIndex int
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lineCount int
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visState termVis
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visAnim float64
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bgColor color.RGBA
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fgColor color.RGBA
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infoColor color.RGBA
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warningColor color.RGBA
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errorColor color.RGBA
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actions map[string]termActionEntry
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}
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func (t *terminal) Advance(elapsed float64) error {
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switch t.visState {
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case termVisShowing:
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t.visAnim = math.Min(maxVisAnim, t.visAnim+elapsed/termAnimLength)
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if t.visAnim == maxVisAnim {
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t.visState = termVisShown
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}
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case termVisHiding:
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t.visAnim = math.Max(minVisAnim, t.visAnim-elapsed/termAnimLength)
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if t.visAnim == minVisAnim {
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t.visState = termVisHidden
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}
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}
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if !t.IsVisible() {
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return nil
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}
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return nil
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}
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func (t *terminal) OnKeyDown(event d2interface.KeyEvent) bool {
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if event.Key() == d2interface.KeyGraveAccent {
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t.toggleTerminal()
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}
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if !t.IsVisible() {
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return false
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}
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switch event.Key() {
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case d2interface.KeyEscape:
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t.command = ""
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case d2interface.KeyEnd:
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t.outputIndex = 0
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case d2interface.KeyHome:
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t.outputIndex = d2common.MaxInt(0, len(t.outputHistory)-t.lineCount)
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case d2interface.KeyPageUp:
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maxOutputIndex := d2common.MaxInt(0, len(t.outputHistory)-t.lineCount)
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if t.outputIndex += t.lineCount; t.outputIndex >= maxOutputIndex {
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t.outputIndex = maxOutputIndex
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}
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case d2interface.KeyPageDown:
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if t.outputIndex -= t.lineCount; t.outputIndex < 0 {
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t.outputIndex = 0
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}
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case d2interface.KeyUp, d2interface.KeyDown:
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t.handleControlKey(event.Key(), event.KeyMod())
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case d2interface.KeyEnter:
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t.processCommand()
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case d2interface.KeyBackspace:
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if len(t.command) > 0 {
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t.command = t.command[:len(t.command)-1]
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}
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}
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return true
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}
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func (t *terminal) processCommand() {
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if t.command == "" {
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return
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}
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n := 0
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for _, command := range t.commandHistory {
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if command != t.command {
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t.commandHistory[n] = command
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n++
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}
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}
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t.commandHistory = t.commandHistory[:n]
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t.commandHistory = append(t.commandHistory, t.command)
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t.Outputf(t.command)
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if err := t.Execute(t.command); err != nil {
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t.OutputErrorf(err.Error())
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}
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t.commandIndex = len(t.commandHistory) - 1
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t.command = ""
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}
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func (t *terminal) handleControlKey(eventKey d2interface.Key, keyMod d2interface.KeyMod) {
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switch eventKey {
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case d2interface.KeyUp:
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if keyMod == d2interface.KeyModControl {
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t.lineCount = d2common.MaxInt(0, t.lineCount-1)
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} else if len(t.commandHistory) > 0 {
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t.command = t.commandHistory[t.commandIndex]
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if t.commandIndex == 0 {
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t.commandIndex = len(t.commandHistory) - 1
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} else {
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t.commandIndex--
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}
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}
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case d2interface.KeyDown:
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if keyMod == d2interface.KeyModControl {
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t.lineCount = d2common.MinInt(t.lineCount+1, termRowCountMax)
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}
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}
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}
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func (t *terminal) toggleTerminal() {
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if t.visState == termVisHiding || t.visState == termVisHidden {
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t.Show()
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} else {
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t.Hide()
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}
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}
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func (t *terminal) OnKeyChars(event d2interface.KeyCharsEvent) bool {
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if !t.IsVisible() {
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return false
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}
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var handled bool
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for _, c := range event.Chars() {
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if c != '`' {
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t.command += string(c)
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handled = true
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}
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}
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return handled
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}
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func (t *terminal) Render(surface d2interface.Surface) error {
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if !t.IsVisible() {
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return nil
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}
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totalWidth, _ := surface.GetSize()
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outputHeight := t.lineCount * termCharHeight
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totalHeight := outputHeight + termCharHeight
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offset := -int((1.0 - easeInOut(t.visAnim)) * float64(totalHeight))
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surface.PushTranslation(0, offset)
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surface.DrawRect(totalWidth, outputHeight, t.bgColor)
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for i := 0; i < t.lineCount; i++ {
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historyIndex := len(t.outputHistory) - i - t.outputIndex - 1
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if historyIndex < 0 {
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break
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}
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historyEntry := t.outputHistory[historyIndex]
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surface.PushTranslation(termCharWidth*2, outputHeight-(i+1)*termCharHeight)
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surface.DrawText(historyEntry.text)
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surface.PushTranslation(-termCharWidth*2, 0)
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switch historyEntry.category {
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case d2interface.TermCategoryInfo:
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surface.DrawRect(termCharWidth, termCharHeight, t.infoColor)
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case d2interface.TermCategoryWarning:
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surface.DrawRect(termCharWidth, termCharHeight, t.warningColor)
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case d2interface.TermCategoryError:
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surface.DrawRect(termCharWidth, termCharHeight, t.errorColor)
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}
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surface.Pop()
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surface.Pop()
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}
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surface.PushTranslation(0, outputHeight)
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surface.DrawRect(totalWidth, termCharHeight, t.fgColor)
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surface.DrawText("> " + t.command)
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surface.Pop()
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surface.Pop()
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return nil
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}
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func (t *terminal) Execute(command string) error {
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params := parseCommand(command)
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if len(params) == 0 {
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return errors.New("invalid command")
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}
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actionName := params[0]
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actionParams := params[1:]
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actionEntry, ok := t.actions[actionName]
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if !ok {
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return errors.New("action not found")
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}
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actionType := reflect.TypeOf(actionEntry.action)
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if actionType.Kind() != reflect.Func {
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return errors.New("action is not a function")
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}
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if len(actionParams) != actionType.NumIn() {
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return errors.New("action requires different argument count")
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}
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paramValues, err := parseActionParams(actionType, actionParams)
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if err != nil {
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return err
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}
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actionValue := reflect.ValueOf(actionEntry.action)
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actionReturnValues := actionValue.Call(paramValues)
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if actionReturnValueCount := len(actionReturnValues); actionReturnValueCount > 0 {
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t.OutputInfof("function returned %d values:", actionReturnValueCount)
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for _, actionReturnValue := range actionReturnValues {
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t.OutputInfof("%v: %s", actionReturnValue.Interface(), actionReturnValue.String())
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}
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}
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return nil
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}
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func parseActionParams(actionType reflect.Type, actionParams []string) ([]reflect.Value, error) {
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var paramValues []reflect.Value
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for i := 0; i < actionType.NumIn(); i++ {
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actionParam := actionParams[i]
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switch actionType.In(i).Kind() {
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case reflect.String:
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paramValues = append(paramValues, reflect.ValueOf(actionParam))
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case reflect.Int:
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value, err := strconv.ParseInt(actionParam, 10, 64)
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if err != nil {
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return nil, err
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}
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paramValues = append(paramValues, reflect.ValueOf(int(value)))
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case reflect.Uint:
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value, err := strconv.ParseUint(actionParam, 10, 64)
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if err != nil {
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return nil, err
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}
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paramValues = append(paramValues, reflect.ValueOf(uint(value)))
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case reflect.Float64:
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value, err := strconv.ParseFloat(actionParam, 64)
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if err != nil {
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return nil, err
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}
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paramValues = append(paramValues, reflect.ValueOf(value))
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case reflect.Bool:
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value, err := strconv.ParseBool(actionParam)
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if err != nil {
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return nil, err
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}
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paramValues = append(paramValues, reflect.ValueOf(value))
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default:
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return nil, errors.New("action has unsupported arguments")
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}
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}
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return paramValues, nil
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}
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func (t *terminal) OutputRaw(text string, category d2interface.TermCategory) {
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var line string
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for _, word := range strings.Split(text, " ") {
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if len(line) > 0 {
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line += " "
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}
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lineLength := len(line)
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wordLength := len(word)
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if lineLength+wordLength >= termColCountMax {
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t.outputHistory = append(t.outputHistory, termHistoryEntry{line, category})
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line = word
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} else {
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line += word
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}
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}
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t.outputHistory = append(t.outputHistory, termHistoryEntry{line, category})
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}
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func (t *terminal) Outputf(format string, params ...interface{}) {
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t.OutputRaw(fmt.Sprintf(format, params...), d2interface.TermCategoryNone)
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}
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func (t *terminal) OutputInfof(format string, params ...interface{}) {
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t.OutputRaw(fmt.Sprintf(format, params...), d2interface.TermCategoryInfo)
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}
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func (t *terminal) OutputWarningf(format string, params ...interface{}) {
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t.OutputRaw(fmt.Sprintf(format, params...), d2interface.TermCategoryWarning)
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}
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func (t *terminal) OutputErrorf(format string, params ...interface{}) {
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t.OutputRaw(fmt.Sprintf(format, params...), d2interface.TermCategoryError)
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}
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func (t *terminal) OutputClear() {
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t.outputHistory = nil
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t.outputIndex = 0
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}
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func (t *terminal) IsVisible() bool {
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return t.visState != termVisHidden
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}
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func (t *terminal) Hide() {
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if t.visState != termVisHidden {
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t.visState = termVisHiding
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}
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}
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func (t *terminal) Show() {
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if t.visState != termVisShown {
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t.visState = termVisShowing
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}
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}
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func (t *terminal) BindAction(name, description string, action interface{}) error {
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actionType := reflect.TypeOf(action)
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if actionType.Kind() != reflect.Func {
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return errors.New("action is not a function")
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}
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for i := 0; i < actionType.NumIn(); i++ {
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switch actionType.In(i).Kind() {
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case reflect.String:
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case reflect.Int:
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case reflect.Uint:
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case reflect.Float64:
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case reflect.Bool:
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default:
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return errors.New("action has unsupported arguments")
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}
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}
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t.actions[name] = termActionEntry{action, description}
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return nil
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}
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func (t *terminal) BindLogger() {
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log.SetOutput(&terminalLogger{writer: log.Writer(), terminal: t})
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}
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func (t *terminal) UnbindAction(name string) error {
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delete(t.actions, name)
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return nil
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}
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func easeInOut(t float64) float64 {
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t *= 2
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if t < 1 {
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return 0.5 * t * t * t * t
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}
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t -= 2
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return -0.5 * (t*t*t*t - 2)
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}
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func parseCommand(command string) []string {
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var (
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quoted bool
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escape bool
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param string
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params []string
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)
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for _, c := range command {
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switch c {
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case '"':
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if escape {
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param += string(c)
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escape = false
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} else {
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quoted = !quoted
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}
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case ' ':
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if quoted {
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param += string(c)
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} else if len(param) > 0 {
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params = append(params, param)
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param = ""
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}
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case '\\':
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if escape {
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param += string(c)
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escape = false
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} else {
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escape = true
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}
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default:
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param += string(c)
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}
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}
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if len(param) > 0 {
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params = append(params, param)
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}
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return params
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}
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func createTerminal() (*terminal, error) {
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terminal := &terminal{
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lineCount: termRowCount,
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bgColor: color.RGBA{R: 0x2e, G: 0x34, B: 0x36, A: 0xb0},
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fgColor: color.RGBA{R: 0x55, G: 0x57, B: 0x53, A: 0xb0},
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infoColor: color.RGBA{R: 0x34, G: 0x65, B: 0xa4, A: 0xb0},
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warningColor: color.RGBA{R: 0xfc, G: 0xe9, B: 0x4f, A: 0xb0},
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errorColor: color.RGBA{R: 0xcc, A: 0xb0},
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actions: make(map[string]termActionEntry),
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}
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terminal.OutputInfof("::: OpenDiablo2 Terminal :::")
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terminal.OutputInfof("type \"ls\" for a list of actions")
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err := terminal.BindAction("ls", "list available actions", func() {
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var names []string
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for name := range terminal.actions {
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names = append(names, name)
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}
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sort.Strings(names)
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terminal.OutputInfof("available actions (%d):", len(names))
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for _, name := range names {
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entry := terminal.actions[name]
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terminal.OutputInfof("%s: %s; %s", name, entry.description, reflect.TypeOf(entry.action).String())
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}
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})
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if err != nil {
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return nil, fmt.Errorf("failed to bind the '%s' action, err: %w", "ls", err)
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}
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err = terminal.BindAction("clear", "clear terminal", func() {
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terminal.OutputClear()
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})
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if err != nil {
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return nil, fmt.Errorf("failed to bind the '%s' action, err: %w", "clear", err)
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}
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return terminal, nil
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}
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