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tui.go
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tui.go
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/*
* ELF tree - Tree viewer for ELF library dependency
*
* Copyright (C) 2017 Namhyung Kim <[email protected]>
*
* Released under MIT license.
*/
package main
import (
"fmt"
tui "github.com/airking05/termui" // for termui bug #177
)
type TreeItem struct {
node interface{}
parent *TreeItem
prev *TreeItem // pointer to siblings
next *TreeItem
child *TreeItem // pointer to first child
folded bool
total int // number of (shown) children (not count itself)
}
type TreeView struct {
tui.Block // embedded
Root *TreeItem
Top *TreeItem
Curr *TreeItem
ItemFgColor tui.Attribute
ItemBgColor tui.Attribute
FocusFgColor tui.Attribute
FocusBgColor tui.Attribute
idx int // current cursor position
off int // first entry displayed
pos int // position of x-axis
rows int
cols int
}
type FileInfo struct {
Root *TreeItem
Top *TreeItem
Curr *TreeItem
idx int
off int
pos int
}
const (
MODE_FILE = iota
MODE_SYMBOL
MODE_DYNAMIC
MODE_SECTION
)
var (
mode int
finfo map[string]*FileInfo
yinfo map[string]*FileInfo
dinfo map[string]*FileInfo
sinfo map[string]*FileInfo
focus *TreeView
)
type StatusLine struct {
tui.Block // embedded
tv *TreeView
}
func NewTreeView() *TreeView {
tv := &TreeView{Block: *tui.NewBlock()}
tv.ItemFgColor = tui.ThemeAttr("list.item.fg")
tv.ItemBgColor = tui.ThemeAttr("list.item.bg")
tv.idx = 0
tv.off = 0
return tv
}
func NewStatusLine(tv *TreeView) *StatusLine {
sl := &StatusLine{Block: *tui.NewBlock()}
sl.Block.Border = false
sl.tv = tv
return sl
}
func (ti *TreeItem) prevItem() *TreeItem {
if ti.prev == nil {
return ti.parent
}
ti = ti.prev
// find last child of previous sibling
for ti != nil {
if ti.child == nil || ti.folded {
return ti
}
ti = ti.child
for ti.next != nil {
ti = ti.next
}
}
return nil
}
func (ti *TreeItem) nextItem() *TreeItem {
if ti.child == nil || ti.folded {
for ti != nil {
if ti.next != nil {
return ti.next
}
ti = ti.parent
}
return nil
}
return ti.child
}
func (ti *TreeItem) expand() {
if !ti.folded || ti.child == nil {
return
}
for c := ti.child; c != nil; c = c.next {
ti.total = c.total 1
}
for p := ti.parent; p != nil; p = p.parent {
p.total = ti.total
}
ti.folded = false
}
func (ti *TreeItem) fold() {
if ti.folded || ti.child == nil {
return
}
for p := ti.parent; p != nil; p = p.parent {
p.total -= ti.total
}
ti.total = 0
ti.folded = true
}
func (ti *TreeItem) toggle() {
if ti.folded {
ti.expand()
} else {
ti.fold()
}
}
func (tv *TreeView) drawDepsNode(buf tui.Buffer, dn *DepsNode, i, printed int, folded bool) {
fg := tv.ItemFgColor
bg := tv.ItemBgColor
if i == tv.idx {
if focus == tv {
fg = tv.FocusFgColor
bg = tv.FocusBgColor
} else {
fg = tv.ItemBgColor
bg = tv.ItemFgColor
}
}
indent := 3 * dn.depth
text_width := tv.cols - 2 - indent
if text_width < 0 {
text_width = 0
}
cs := tui.DefaultTxBuilder.Build(dn.name, fg, bg)
cs = tui.DTrimTxCls(cs, text_width)
j := 0
if i == tv.idx {
// draw current line cursor from the beginning
for j < indent {
if j 1 > tv.pos {
buf.Set(j 1-tv.pos, printed 1, tui.Cell{' ', fg, bg})
}
j
}
} else {
j = indent
}
if j 1 > tv.pos {
if folded {
buf.Set(j 1-tv.pos, printed 1, tui.Cell{' ', fg, bg})
} else {
buf.Set(j 1-tv.pos, printed 1, tui.Cell{'-', fg, bg})
}
}
if j 2 > tv.pos {
buf.Set(j 2-tv.pos, printed 1, tui.Cell{' ', fg, bg})
}
j = 2
for _, vv := range cs {
w := vv.Width()
if j 1 > tv.pos {
buf.Set(j 1-tv.pos, printed 1, vv)
}
j = w
}
if i != tv.idx {
return
}
// draw current line cursor to the end
for j < tv.cols tv.pos {
if j 1 > tv.pos {
buf.Set(j 1-tv.pos, printed 1, tui.Cell{' ', fg, bg})
}
j
}
}
func (tv *TreeView) drawStrNode(buf tui.Buffer, s string, i, printed int, sign rune) {
fg := tv.ItemFgColor
bg := tv.ItemBgColor
if i == tv.idx {
if focus == tv {
fg = tv.FocusFgColor
bg = tv.FocusBgColor
}
}
cs := tui.DefaultTxBuilder.Build(s, fg, bg)
cs = tui.DTrimTxCls(cs, tv.cols-2)
j := 0
if j 1 > tv.pos {
buf.Set(tv.X j 1-tv.pos, printed 1, tui.Cell{sign, fg, bg})
}
if j 2 > tv.pos {
buf.Set(tv.X j 2-tv.pos, printed 1, tui.Cell{' ', fg, bg})
}
j = 2
for _, vv := range cs {
w := vv.Width()
if j 1 > tv.pos {
buf.Set(tv.X j 1-tv.pos, printed 1, vv)
}
j = w
}
if i != tv.idx {
return
}
// draw current line cursor to the end
for j < tv.cols tv.pos {
if j 1 > tv.pos {
buf.Set(tv.X j 1-tv.pos, printed 1, tui.Cell{' ', fg, bg})
}
j
}
}
// Buffer implements Bufferer interface.
func (tv *TreeView) Buffer() tui.Buffer {
buf := tv.Block.Buffer()
i := 0
printed := 0
var ti *TreeItem
for ti = tv.Root; ti != nil; ti = ti.nextItem() {
if i < tv.off {
i
continue
}
if printed == tv.rows {
break
}
switch node := ti.node.(type) {
case *DepsNode:
tv.drawDepsNode(buf, node, i, printed, ti.folded)
printed
i
case string:
sign := ' '
if ti.folded {
sign = ' '
} else if ti.child != nil {
sign = '-'
}
tv.drawStrNode(buf, node, i, printed, sign)
printed
i
default:
}
}
return buf
}
func (tv *TreeView) Down() {
if tv.idx < tv.Root.total {
tv.idx
tv.Curr = tv.Curr.nextItem()
}
if tv.idx-tv.off >= tv.rows {
tv.off
tv.Top = tv.Top.nextItem()
}
}
func (tv *TreeView) Up() {
if tv.idx > 0 {
tv.idx--
tv.Curr = tv.Curr.prevItem()
}
if tv.idx < tv.off {
tv.off = tv.idx
tv.Top = tv.Curr
}
}
func (tv *TreeView) PageDown() {
idx := tv.idx
bottom := tv.off tv.rows - 1
if bottom > tv.Root.total {
bottom = tv.Root.total
}
// At first, move to the bottom of current page
if tv.idx != bottom {
tv.idx = bottom
for idx != bottom {
tv.Curr = tv.Curr.nextItem()
idx
}
return
}
tv.idx = tv.rows
if tv.idx > tv.Root.total {
tv.idx = tv.Root.total
}
for idx != tv.idx {
tv.Curr = tv.Curr.nextItem()
idx
}
off := tv.off
if tv.idx-tv.off >= tv.rows {
tv.off = tv.idx - tv.rows 1
for off != tv.off {
tv.Top = tv.Top.nextItem()
off
}
}
}
func (tv *TreeView) PageUp() {
idx := tv.idx
// At first, move to the top of current page
if tv.idx != tv.off {
tv.idx = tv.off
tv.Curr = tv.Top
return
}
tv.idx -= tv.rows
if tv.idx < 0 {
tv.idx = 0
}
tv.off = tv.idx
for idx != tv.idx {
tv.Curr = tv.Curr.prevItem()
idx--
}
tv.Top = tv.Curr
}
func (tv *TreeView) Home() {
tv.idx = 0
tv.off = 0
tv.Curr = tv.Root
tv.Top = tv.Root
}
func (tv *TreeView) End() {
tv.idx = tv.Root.total
tv.off = tv.idx - tv.rows 1
if tv.off < 0 {
tv.off = 0
}
for next := tv.Curr; next != nil; next = next.nextItem() {
tv.Curr = next
}
off := tv.idx
top := tv.Curr
for off != tv.off {
top = top.prevItem()
off--
}
tv.Top = top
}
func (tv *TreeView) Left(i int) {
tv.pos -= i
if tv.pos < 0 {
tv.pos = 0
}
}
func (tv *TreeView) Right(i int) {
tv.pos = i
}
func (tv *TreeView) Toggle() {
tv.Curr.toggle()
}
// Buffer implements Bufferer interface.
func (sl *StatusLine) Buffer() tui.Buffer {
buf := sl.Block.Buffer()
var line string
curr := sl.tv.Curr
if curr != nil {
node := curr.node.(*DepsNode)
line = node.name
n := node.parent
for n != nil {
line = n.name " > " line
n = n.parent
}
} else {
line = "ELF tree"
}
fg := tui.ColorBlack
bg := tui.ColorWhite
cs := tui.DefaultTxBuilder.Build(line, fg, bg)
cs = tui.DTrimTxCls(cs, sl.Width-3)
buf.Set(0, sl.Y, tui.Cell{' ', fg, bg})
buf.Set(1, sl.Y, tui.Cell{' ', fg, bg})
j := 2
for _, vv := range cs {
w := vv.Width()
buf.Set(j, sl.Y, vv)
j = w
}
// draw status line to the end
for j < sl.Width {
buf.Set(j, sl.Y, tui.Cell{' ', fg, bg})
j
}
return buf
}
func makeDepsItems(dep *DepsNode, parent *TreeItem) *TreeItem {
item := &TreeItem{node: dep, parent: parent, folded: false, total: len(dep.child)}
var prev *TreeItem
for _, v := range dep.child {
c := makeDepsItems(v, item)
if item.child == nil {
item.child = c
}
if prev != nil {
prev.next = c
c.prev = prev
}
prev = c
item.total = c.total
}
return item
}
func AddSubTree(name string, items []string, parent *TreeItem) {
var t, p *TreeItem
t = &TreeItem{node: name, parent: parent}
if parent.child == nil {
parent.child = t
} else {
p = parent.child
for p.next != nil {
p = p.next
}
p.next = t
t.prev = p
}
p = nil
parent = t
for _, item := range items {
t = &TreeItem{node: item, parent: parent}
if p == nil {
parent.child = t
} else {
p.next = t
t.prev = p
}
p = t
}
parent.total = len(items)
parent.parent.total = len(items) 1
}
func makeFileInfo(name string, info *DepsInfo) *FileInfo {
root := &TreeItem{node: name}
// general file info
AddSubTree("", nil, root)
AddSubTree("File Info", []string{" Path: " info.path,
" Type: " info.kind.String() ", " info.mach.String(),
" Data: " info.bits.String() ", " info.endian.String()},
root)
// program headers
var phdr []string
for _, v := range info.prog {
phdr = append(phdr, " " progHdrString(v))
}
AddSubTree("", nil, root)
AddSubTree(fmt.Sprintf("%-16s %s s s %8s",
"Program Info", "Flags", "Vaddr", "Size", "Align"),
phdr, root)
// dependent libraries
var libs []string
for _, v := range info.libs {
libs = append(libs, " " v)
}
AddSubTree("", nil, root)
AddSubTree("Dependencies", libs, root)
return &FileInfo{Root: root, Top: root, Curr: root}
}
func makeSymbolInfo(name string, info *DepsInfo) *FileInfo {
root := &TreeItem{node: name}
// dynamic symbols
AddSubTree("", nil, root)
var dsym []string
for _, v := range info.dsym {
dsym = append(dsym, makeSymbolString(v))
}
AddSubTree("Dynamic Symbols", dsym, root)
// normal symbols
AddSubTree("", nil, root)
var nsym []string
for _, v := range info.syms {
nsym = append(nsym, makeSymbolString(v))
}
AddSubTree("Symbols", nsym, root)
return &FileInfo{Root: root, Top: root, Curr: root}
}
func makeDynamicInfo(name string, info *DepsInfo) *FileInfo {
root := &TreeItem{node: name}
// dynamic info
AddSubTree("", nil, root)
AddSubTree("Dynamic Info", makeDynamicStrings(info), root)
return &FileInfo{Root: root, Top: root, Curr: root}
}
func makeSectionInfo(name string, info *DepsInfo) *FileInfo {
root := &TreeItem{node: name}
// section headers
AddSubTree("", nil, root)
var sect []string
sect = append(sect, fmt.Sprintf(" %4s %-24s %-12s %8s %8s %4s",
"Idx", "Name", "Type", "Offset", "Size", "Flag"))
for i, v := range info.sect {
sect = append(sect, makeSectionString(i, v))
}
AddSubTree("Section Info", sect, root)
return &FileInfo{Root: root, Top: root, Curr: root}
}
func saveInfoView(tv, iv *TreeView) {
if focus != tv {
return
}
curr := tv.Curr
node := curr.node.(*DepsNode)
var info *FileInfo
if mode == MODE_FILE {
info = finfo[node.name]
} else if mode == MODE_SYMBOL {
info = yinfo[node.name]
} else if mode == MODE_DYNAMIC {
info = dinfo[node.name]
} else if mode == MODE_SECTION {
info = sinfo[node.name]
}
info.Root = iv.Root
info.Top = iv.Top
info.Curr = iv.Curr
info.off = iv.off
info.idx = iv.idx
info.pos = iv.pos
}
func restoreInfoView(tv, iv *TreeView) {
if focus != tv {
return
}
curr := tv.Curr
node := curr.node.(*DepsNode)
var info *FileInfo
if mode == MODE_FILE {
info = finfo[node.name]
} else if mode == MODE_SYMBOL {
info = yinfo[node.name]
} else if mode == MODE_DYNAMIC {
info = dinfo[node.name]
} else if mode == MODE_SECTION {
info = sinfo[node.name]
}
iv.Root = info.Root
iv.Top = info.Top
iv.Curr = info.Curr
iv.off = info.off
iv.idx = info.idx
iv.pos = info.pos
}
func resize(tv, iv *TreeView, sl *StatusLine) {
tv.Height = tui.TermHeight() - 1
tv.Width = tui.TermWidth() * 3 / 5
tv.rows = tv.Height - 2 // exclude border at top and bottom
tv.cols = tv.Width - 2 // exclude border at left and right
iv.Height = tui.TermHeight() - 1
iv.Width = tui.TermWidth() - tv.Width
iv.X = tv.Width
iv.rows = iv.Height - 2
iv.cols = iv.Width - 2
sl.Height = 1
sl.Width = tui.TermWidth()
sl.Y = tui.TermHeight() - 1
}
func ShowWithTUI(dep *DepsNode) {
if err := tui.Init(); err != nil {
panic(err)
}
defer tui.Close()
root := makeDepsItems(dep, nil)
tv := NewTreeView()
tv.Root = root
tv.Curr = root
tv.Top = root
tv.FocusFgColor = tui.ColorYellow
tv.FocusBgColor = tui.ColorBlue
tv.BorderLabel = "ELF Tree"
iv := NewTreeView()
iv.FocusFgColor = tui.ColorYellow
iv.FocusBgColor = tui.ColorBlue
sl := NewStatusLine(tv)
finfo = make(map[string]*FileInfo)
yinfo = make(map[string]*FileInfo)
dinfo = make(map[string]*FileInfo)
sinfo = make(map[string]*FileInfo)
for k, v := range deps {
finfo[k] = makeFileInfo(k, &v)
yinfo[k] = makeSymbolInfo(k, &v)
dinfo[k] = makeDynamicInfo(k, &v)
sinfo[k] = makeSectionInfo(k, &v)
}
mode = MODE_FILE
focus = tv
restoreInfoView(tv, iv)
resize(tv, iv, sl)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
// handle key pressing
tui.Handle("/sys/kbd/q", func(tui.Event) {
// press q to quit
tui.StopLoop()
})
tui.Handle("/sys/kbd/C-c", func(tui.Event) {
// press Ctrl-C to quit
tui.StopLoop()
})
tui.Handle("/sys/kbd/f", func(tui.Event) {
if focus == tv {
mode = MODE_FILE
restoreInfoView(tv, iv)
}
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/y", func(tui.Event) {
if focus == tv {
mode = MODE_SYMBOL
restoreInfoView(tv, iv)
}
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/d", func(tui.Event) {
if focus == tv {
mode = MODE_DYNAMIC
restoreInfoView(tv, iv)
}
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/s", func(tui.Event) {
if focus == tv {
mode = MODE_SECTION
restoreInfoView(tv, iv)
}
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<down>", func(tui.Event) {
saveInfoView(tv, iv)
focus.Down()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<up>", func(tui.Event) {
saveInfoView(tv, iv)
focus.Up()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<left>", func(tui.Event) {
focus.Left(1)
tui.Render(focus)
// no need to redraw sl
})
tui.Handle("/sys/kbd/<right>", func(tui.Event) {
focus.Right(1)
tui.Render(focus)
// no need to redraw sl
})
tui.Handle("/sys/kbd/<", func(tui.Event) {
focus.Left(3)
tui.Render(focus)
// no need to redraw sl
})
tui.Handle("/sys/kbd/>", func(tui.Event) {
focus.Right(3)
tui.Render(focus)
// no need to redraw sl
})
tui.Handle("/sys/kbd/<next>", func(tui.Event) {
saveInfoView(tv, iv)
focus.PageDown()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<previous>", func(tui.Event) {
saveInfoView(tv, iv)
focus.PageUp()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<home>", func(tui.Event) {
saveInfoView(tv, iv)
focus.Home()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<end>", func(tui.Event) {
saveInfoView(tv, iv)
focus.End()
restoreInfoView(tv, iv)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<enter>", func(tui.Event) {
focus.Toggle()
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/kbd/<tab>", func(tui.Event) {
if focus == tv {
focus = iv
} else {
focus = tv
}
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Handle("/sys/wnd/resize", func(tui.Event) {
resize(tv, iv, sl)
tui.Render(tv)
tui.Render(iv)
tui.Render(sl)
})
tui.Loop()
}