v0.30.0 lw --tui, compose pipeline on screen
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package tui
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import (
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"fmt"
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"regexp"
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"slices"
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"strconv"
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"strings"
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"github.com/lixenwraith/logwisp/internal/compose"
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"github.com/lixenwraith/logwisp/internal/config"
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"github.com/lixenwraith/terminal"
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ui "github.com/lixenwraith/terminal/tui"
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)
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const (
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pitch = 3 // rows a source or sink takes, its gap included
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gutter = 4 // columns of wire on either side of the flow box
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wideMin = 64 // the narrowest canvas with the parts side by side
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)
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// spot is where a node draws: its first row and the columns it may use
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type spot struct{ x, y, w int }
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// layout places a pipeline's parts: side by side with wires from 64 columns,
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// stacked below that
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type layout struct {
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wide bool
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h int
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title [3]spot
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nodes [3][]spot // a column's nodes, or its one empty slot
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box spot // the flow box's top left and width
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boxH int
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entry, exit int // the rows wires enter and leave the flow box
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}
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func (a *app) layout(w int) layout {
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var l layout
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counts := [3]int{}
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for col := range columns {
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counts[col] = max(1, len(a.nodes(col)))
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}
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stages := counts[flowCol]
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l.boxH = stages + 2
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if w >= wideMin {
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l.wide = true
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boxW := max(18, min(30, (w-2*gutter)/3))
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sideW := (w - boxW - 2*gutter) / 2
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xs := [3]int{0, sideW + gutter, sideW + 2*gutter + boxW}
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ws := [3]int{sideW, boxW, w - xs[sinksCol]}
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for col := range columns {
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l.title[col] = spot{xs[col], 0, ws[col]}
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}
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l.box = spot{xs[flowCol], 1, boxW}
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for _, col := range []int{sourcesCol, sinksCol} {
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for i := range counts[col] {
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l.nodes[col] = append(l.nodes[col], spot{xs[col], 1 + i*pitch, ws[col]})
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}
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}
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l.entry = l.box.y + 1 + (stages-1)/2
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l.exit = l.entry
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l.h = 1 + max(counts[sourcesCol]*pitch-1, l.boxH, counts[sinksCol]*pitch-1)
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} else {
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y := 0
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for col := range columns {
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l.title[col] = spot{0, y, w}
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y++
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if col == flowCol {
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l.box = spot{0, y, w}
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y += l.boxH
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} else {
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for range counts[col] {
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l.nodes[col] = append(l.nodes[col], spot{0, y, w})
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y += pitch
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}
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y--
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}
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if col != sinksCol {
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y++ // the arrow down to the next part
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}
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}
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l.h = y
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}
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for i := range stages {
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l.nodes[flowCol] = append(l.nodes[flowCol], spot{l.box.x + 2, l.box.y + 1 + i, l.box.w - 4})
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}
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return l
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}
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// drawCanvas draws the pipeline, scrolled to keep the chosen node in view
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func (a *app) drawCanvas(r ui.Region) {
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l := a.layout(r.W)
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chosen := l.nodes[a.col][min(a.row[a.col], len(l.nodes[a.col])-1)]
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if chosen.y < a.scroll {
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a.scroll = chosen.y
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}
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if tall := 2 - a.col%2; chosen.y+tall > a.scroll+r.H {
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a.scroll = chosen.y + tall - r.H
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}
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a.scroll = max(0, min(a.scroll, l.h-r.H))
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// Drawn whole off screen, then the rows in view copied
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cells := make([]terminal.Cell, r.W*l.h)
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full := ui.NewRegion(cells, r.W, 0, 0, r.W, l.h)
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full.FillStyle(a.th.Text)
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a.drawParts(full, l)
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for y := range min(r.H, l.h-a.scroll) {
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copy(r.Cells[(r.Y+y)*r.TotalW+r.X:][:r.W], cells[(a.scroll+y)*r.W:][:r.W])
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}
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}
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func (a *app) drawParts(r ui.Region, l layout) {
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th, f := a.th, a.font
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tints := [3]ui.Style{a.look.Source, a.look.Flow, a.look.Sink}
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for col, c := range columns {
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t := l.title[col]
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r.TextStyled(t.x, t.y, string(f.dot)+" "+c.title, tints[col].On(th.Text))
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}
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a.drawBox(r, l)
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g := wires{w: r.W, arms: make([]uint8, r.W*l.h)}
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for _, col := range []int{sourcesCol, sinksCol} {
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nodes := a.nodes(col)
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for i, s := range l.nodes[col] {
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chosen := a.col == col && a.row[col] == i
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if len(nodes) == 0 {
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a.drawEmpty(r, s, columns[col].role, chosen)
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continue
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}
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a.drawNode(r, s, nodes[i], tints[col], chosen)
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}
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if l.wide && len(nodes) > 0 {
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g.join(l, col)
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}
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}
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if !l.wide {
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for _, col := range []int{sourcesCol, flowCol} {
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r.TextStyled(2, l.title[col+1].y-1, string(f.down), th.Border)
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}
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return
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}
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for i, arms := range g.arms {
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if arms != 0 {
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r.TextStyled(i%r.W, i/r.W, string(f.wire[arms]), th.Border)
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}
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}
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if len(a.nodes(sourcesCol)) > 0 {
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r.TextStyled(l.box.x-1, l.entry, string(f.arrow), th.Border)
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}
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if len(a.nodes(sinksCol)) > 0 {
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r.TextStyled(l.box.x+l.box.w+1, l.exit, string(f.arrow), th.Border)
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}
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}
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// wires are the canvas's cells by the arms they have: up 1, right 2, down 4,
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// left 8, so every junction draws from what meets there
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type wires struct {
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w int
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arms []uint8
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}
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func (g wires) h(y, x0, x1 int) {
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for x := x0; x < x1; x++ {
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g.arms[y*g.w+x] |= 2
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g.arms[y*g.w+x+1] |= 8
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}
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}
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func (g wires) v(x, y0, y1 int) {
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for y := y0; y < y1; y++ {
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g.arms[y*g.w+x] |= 4
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g.arms[(y+1)*g.w+x] |= 1
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}
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}
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// join wires a column's nodes to a trunk beside the flow box, and the trunk
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// to the box's side
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func (g wires) join(l layout, col int) {
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ys := []int{l.entry}
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if col == sinksCol {
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ys[0] = l.exit
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}
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for _, s := range l.nodes[col] {
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ys = append(ys, s.y)
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}
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if col == sourcesCol {
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trunk := l.box.x - gutter + 1
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for _, s := range l.nodes[col] {
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g.h(s.y, trunk-1, trunk)
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}
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g.v(trunk, slices.Min(ys), slices.Max(ys))
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g.h(l.entry, trunk, l.box.x-1)
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return
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}
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right := l.box.x + l.box.w
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trunk := right + 2
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g.h(l.exit, right, trunk)
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g.v(trunk, slices.Min(ys), slices.Max(ys))
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for _, s := range l.nodes[col] {
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g.h(s.y, trunk, s.x-1)
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}
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}
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// drawNode draws a source or sink: a tinted bar, its type and whether it
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// listens or dials, then a summary of its options. The chosen node's bar is
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// solid; a node the first problem names has its bar in the error style.
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func (a *app) drawNode(r ui.Region, s spot, n compose.Node, tint ui.Style, chosen bool) {
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th := a.th
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bg, bar := th.Text, a.font.bar
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if chosen {
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bg, bar = th.Text.On(th.Selected), a.font.barOn
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}
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if a.faulty(n) {
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tint = th.Error
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}
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p, _ := a.plugin(n)
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way := map[config.Side]string{config.Listener: "listens", config.ChainListener: "listens", config.Dialer: "dials"}[p.Side]
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for dy, text := range []string{p.Type, a.summary(n)} {
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row := r.Sub(s.x, s.y+dy, s.w, 1)
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row.FillStyle(bg)
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row.TextStyled(0, 0, string(bar), tint.On(bg))
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style := th.Muted.On(bg)
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if dy == 0 {
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style = th.Text.On(bg)
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row.TextStyled(row.W-ui.RuneLen(way), 0, way, th.Muted.On(bg))
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}
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row.TextStyled(2, 0, ui.Truncate(text, row.W-ui.RuneLen(way)-3), style)
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}
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}
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func (a *app) drawEmpty(r ui.Region, s spot, role string, chosen bool) {
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mark, style := " ", a.th.Muted
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if chosen {
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mark, style = string(a.th.Glyphs.Pointer), a.th.Muted.On(a.th.Selected)
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}
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row := r.Sub(s.x, s.y, s.w-1, 1)
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if chosen {
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row.FillStyle(a.th.Text.On(a.th.Selected))
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}
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row.TextStyled(0, 0, mark+" a adds a "+role, style)
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}
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// drawBox draws the flow box, its stages in the order entries pass them; a
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// stage that is off is dimmed with the Off glyph
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func (a *app) drawBox(r ui.Region, l layout) {
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th, f := a.th, a.font
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b := l.box
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edge := []rune(f.box)
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across := strings.Repeat(string(edge[4]), max(0, b.w-2))
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r.TextStyled(b.x, b.y, string(edge[0])+across+string(edge[1]), th.Border)
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r.TextStyled(b.x, b.y+l.boxH-1, string(edge[2])+across+string(edge[3]), th.Border)
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for y := b.y + 1; y < b.y+l.boxH-1; y++ {
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r.TextStyled(b.x, y, string(edge[5]), th.Border)
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r.TextStyled(b.x+b.w-1, y, string(edge[5]), th.Border)
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}
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for i, n := range a.nodes(flowCol) {
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s := l.nodes[flowCol][i]
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chosen := a.col == flowCol && a.row[flowCol] == i
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bg := th.Text
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if chosen {
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bg = th.Text.On(th.Selected)
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}
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row := r.Sub(s.x, s.y, s.w, 1)
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row.FillStyle(bg)
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mark, tint, text := f.bar, a.look.Flow, th.Text
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if chosen {
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mark = f.barOn
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}
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summary := a.summary(n)
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if !a.on(n) {
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mark, tint, text, summary = f.Off, th.Muted, th.Muted, "off"
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if chosen {
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mark = th.Glyphs.Pointer
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}
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}
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if a.faulty(n) {
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tint = th.Error
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}
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row.TextStyled(0, 0, string(mark), tint.On(bg))
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row.TextStyled(2, 0, n.Role, text.On(bg))
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x := 3 + ui.RuneLen(n.Role)
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row.TextStyled(x, 0, ui.Truncate(summary, row.W-x), th.Muted.On(bg))
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}
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}
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// on reports whether a node is on: a flow stage that is off has no options,
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// or an enabled key that is false
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func (a *app) on(n compose.Node) bool {
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if n.Role == "filters" {
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return len(a.pipeline().Flow.Filters) > 0
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}
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opts, on, _ := a.comp.Options(a.pi, n)
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if slicesHasKey(a.keys(n), "enabled") {
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return on && opts["enabled"] == true
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}
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return on
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}
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// summary is a node's options in a line: the values set, a table by its
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// name, a switch by its key; the filters as +include and -exclude patterns
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func (a *app) summary(n compose.Node) string {
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if n.Role == "filters" {
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var out []string
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for _, f := range a.pipeline().Flow.Filters {
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sign := map[config.FilterType]string{"include": "+", "exclude": "-"}[f.Type]
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out = append(out, sign+strings.Join(f.Patterns, "|"))
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}
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return strings.Join(out, " ")
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}
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opts, _, _ := a.comp.Options(a.pi, n)
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var out []string
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for _, k := range a.keys(n) {
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v, ok := opts[k.Name]
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switch {
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case !ok || k.Name == "enabled" || v == false:
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case k.Kind == "table":
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if t, _ := v.(map[string]any); t["enabled"] != false {
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out = append(out, k.Name)
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}
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case v == true:
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out = append(out, k.Name)
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default:
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out = append(out, show(v))
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}
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}
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return strings.Join(out, " ")
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}
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// show writes a value as a form does: a list joined by commas
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func show(v any) string {
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switch v := v.(type) {
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case []any:
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var out []string
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for _, e := range v {
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out = append(out, show(e))
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}
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return strings.Join(out, ",")
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case float64:
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return strconv.FormatFloat(v, 'f', -1, 64)
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}
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return fmt.Sprint(v)
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}
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// problemPath reads the part a validation error names: its pipeline, node and
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// key, as config's key paths write them
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var problemPath = regexp.MustCompile(`^pipelines?\[(\d+)\](?:\.(plugin_sources|plugin_sinks)\[([^\]]*)\](?:\.config\.?([\w.]*))?|\.flow\.(\w+)(?:\[(\d+)\])?\.?([\w.]*))?`)
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func locate(err error) (pi int, n compose.Node, key string, ok bool) {
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m := problemPath.FindStringSubmatch(err.Error())
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if m == nil {
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return 0, n, "", false
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}
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pi, _ = strconv.Atoi(m[1])
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switch {
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case m[2] != "":
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n = compose.Node{Role: map[string]string{"plugin_sources": "source", "plugin_sinks": "sink"}[m[2]], ID: m[3]}
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key = m[4]
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case m[5] != "":
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n = compose.Node{Role: m[5]}
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if m[6] != "" {
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n.Index, _ = strconv.Atoi(m[6])
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}
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key = m[7]
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}
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return pi, n, key, true
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}
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// faulty reports whether the first problem names this node, or a filter
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// when n is the filters stage
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func (a *app) faulty(n compose.Node) bool {
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if a.problem == nil {
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return false
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}
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pi, m, _, ok := locate(a.problem)
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return ok && pi == a.pi && m.Role == n.Role && m.ID == n.ID
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}
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