widgets: rename package to app

This is the central point of all aerc. Having it named widgets is
confusing. Rename it to app. It will make a cleaner transition when
making the app.Aerc object available globally in the next commit.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

1 files changed, 299 insertions, 0 deletions

diff --git a/app/listbox.go b/app/listbox.go
new file mode 100644
index 00000000..5a80261e
--- /dev/null
+++ b/app/listbox.go
@@ -0,0 +1,299 @@
+package app
+
+import (
+	"math"
+	"strings"
+	"sync"
+
+	"git.sr.ht/~rjarry/aerc/config"
+	"git.sr.ht/~rjarry/aerc/lib/ui"
+	"git.sr.ht/~rjarry/aerc/log"
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+type ListBox struct {
+	Scrollable
+	title       string
+	lines       []string
+	selected    string
+	cursorPos   int
+	horizPos    int
+	jump        int
+	showCursor  bool
+	showFilter  bool
+	filterMutex sync.Mutex
+	filter      *ui.TextInput
+	uiConfig    *config.UIConfig
+	cb          func(string)
+}
+
+func NewListBox(title string, lines []string, uiConfig *config.UIConfig, cb func(string)) *ListBox {
+	lb := &ListBox{
+		title:     title,
+		lines:     lines,
+		cursorPos: -1,
+		jump:      -1,
+		uiConfig:  uiConfig,
+		cb:        cb,
+		filter:    ui.NewTextInput("", uiConfig),
+	}
+	lb.filter.OnChange(func(ti *ui.TextInput) {
+		var show bool
+		if ti.String() == "" {
+			show = false
+		} else {
+			show = true
+		}
+		lb.setShowFilterField(show)
+		lb.filter.Focus(show)
+		lb.Invalidate()
+	})
+	lb.dedup()
+	return lb
+}
+
+func (lb *ListBox) dedup() {
+	dedupped := make([]string, 0, len(lb.lines))
+	dedup := make(map[string]struct{})
+	for _, line := range lb.lines {
+		if _, dup := dedup[line]; dup {
+			log.Warnf("ignore duplicate: %s", line)
+			continue
+		}
+		dedup[line] = struct{}{}
+		dedupped = append(dedupped, line)
+	}
+	lb.lines = dedupped
+}
+
+func (lb *ListBox) setShowFilterField(b bool) {
+	lb.filterMutex.Lock()
+	defer lb.filterMutex.Unlock()
+	lb.showFilter = b
+}
+
+func (lb *ListBox) showFilterField() bool {
+	lb.filterMutex.Lock()
+	defer lb.filterMutex.Unlock()
+	return lb.showFilter
+}
+
+func (lb *ListBox) Draw(ctx *ui.Context) {
+	defaultStyle := lb.uiConfig.GetStyle(config.STYLE_DEFAULT)
+	titleStyle := lb.uiConfig.GetStyle(config.STYLE_TITLE)
+	w, h := ctx.Width(), ctx.Height()
+	ctx.Fill(0, 0, w, h, ' ', defaultStyle)
+	ctx.Fill(0, 0, w, 1, ' ', titleStyle)
+	ctx.Printf(0, 0, titleStyle, "%s", lb.title)
+
+	y := 0
+	if lb.showFilterField() {
+		y = 1
+		x := ctx.Printf(0, y, defaultStyle, "Filter: ")
+		lb.filter.Draw(ctx.Subcontext(x, y, w-x, 1))
+	}
+
+	lb.drawBox(ctx.Subcontext(0, y+1, w, h-(y+1)))
+}
+
+func (lb *ListBox) moveCursor(delta int) {
+	list := lb.filtered()
+	if len(list) == 0 {
+		return
+	}
+	lb.cursorPos += delta
+	if lb.cursorPos < 0 {
+		lb.cursorPos = 0
+	}
+	if lb.cursorPos >= len(list) {
+		lb.cursorPos = len(list) - 1
+	}
+	lb.selected = list[lb.cursorPos]
+	lb.showCursor = true
+	lb.horizPos = 0
+}
+
+func (lb *ListBox) moveHorizontal(delta int) {
+	lb.horizPos += delta
+	if lb.horizPos > len(lb.selected) {
+		lb.horizPos = len(lb.selected)
+	}
+	if lb.horizPos < 0 {
+		lb.horizPos = 0
+	}
+}
+
+func (lb *ListBox) filtered() []string {
+	list := []string{}
+	filterTerm := lb.filter.String()
+	for _, line := range lb.lines {
+		if strings.Contains(line, filterTerm) {
+			list = append(list, line)
+		}
+	}
+	return list
+}
+
+func (lb *ListBox) drawBox(ctx *ui.Context) {
+	defaultStyle := lb.uiConfig.GetStyle(config.STYLE_DEFAULT)
+	selectedStyle := lb.uiConfig.GetComposedStyleSelected(config.STYLE_MSGLIST_DEFAULT, nil)
+
+	w, h := ctx.Width(), ctx.Height()
+	lb.jump = h
+	list := lb.filtered()
+
+	lb.UpdateScroller(ctx.Height(), len(list))
+	scroll := 0
+	lb.cursorPos = -1
+	for i := 0; i < len(list); i++ {
+		if lb.selected == list[i] {
+			scroll = i
+			lb.cursorPos = i
+			break
+		}
+	}
+	lb.EnsureScroll(scroll)
+
+	needScrollbar := lb.NeedScrollbar()
+	if needScrollbar {
+		w -= 1
+		if w < 0 {
+			w = 0
+		}
+	}
+
+	if lb.lines == nil || len(list) == 0 {
+		return
+	}
+
+	y := 0
+	for i := lb.Scroll(); i < len(list) && y < h; i++ {
+		style := defaultStyle
+		line := runewidth.Truncate(list[i], w-1, "❯")
+		if lb.selected == list[i] && lb.showCursor {
+			style = selectedStyle
+			if len(list[i]) > w {
+				if len(list[i])-lb.horizPos < w {
+					lb.horizPos = len(list[i]) - w + 1
+				}
+				rest := list[i][lb.horizPos:]
+				line = runewidth.Truncate(rest,
+					w-1, "❯")
+				if lb.horizPos > 0 && len(line) > 0 {
+					line = "❮" + line[1:]
+				}
+			}
+		}
+		ctx.Printf(1, y, style, line)
+		y += 1
+	}
+
+	if needScrollbar {
+		scrollBarCtx := ctx.Subcontext(w, 0, 1, ctx.Height())
+		lb.drawScrollbar(scrollBarCtx)
+	}
+}
+
+func (lb *ListBox) drawScrollbar(ctx *ui.Context) {
+	gutterStyle := tcell.StyleDefault
+	pillStyle := tcell.StyleDefault.Reverse(true)
+
+	// gutter
+	h := ctx.Height()
+	ctx.Fill(0, 0, 1, h, ' ', gutterStyle)
+
+	// pill
+	pillSize := int(math.Ceil(float64(h) * lb.PercentVisible()))
+	pillOffset := int(math.Floor(float64(h) * lb.PercentScrolled()))
+	ctx.Fill(0, pillOffset, 1, pillSize, ' ', pillStyle)
+}
+
+func (lb *ListBox) Invalidate() {
+	ui.Invalidate()
+}
+
+func (lb *ListBox) Event(event tcell.Event) bool {
+	if event, ok := event.(*tcell.EventKey); ok {
+		switch event.Key() {
+		case tcell.KeyLeft:
+			lb.moveHorizontal(-1)
+			lb.Invalidate()
+			return true
+		case tcell.KeyRight:
+			lb.moveHorizontal(+1)
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlB:
+			line := lb.selected[:lb.horizPos]
+			fds := strings.Fields(line)
+			if len(fds) > 1 {
+				lb.moveHorizontal(
+					strings.LastIndex(line,
+						fds[len(fds)-1]) - lb.horizPos - 1)
+			} else {
+				lb.horizPos = 0
+			}
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlW:
+			line := lb.selected[lb.horizPos+1:]
+			fds := strings.Fields(line)
+			if len(fds) > 1 {
+				lb.moveHorizontal(strings.Index(line, fds[1]))
+			}
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlA, tcell.KeyHome:
+			lb.horizPos = 0
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlE, tcell.KeyEnd:
+			lb.horizPos = len(lb.selected)
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlP, tcell.KeyUp:
+			lb.moveCursor(-1)
+			lb.Invalidate()
+			return true
+		case tcell.KeyCtrlN, tcell.KeyDown:
+			lb.moveCursor(+1)
+			lb.Invalidate()
+			return true
+		case tcell.KeyPgUp:
+			if lb.jump >= 0 {
+				lb.moveCursor(-lb.jump)
+				lb.Invalidate()
+			}
+			return true
+		case tcell.KeyPgDn:
+			if lb.jump >= 0 {
+				lb.moveCursor(+lb.jump)
+				lb.Invalidate()
+			}
+			return true
+		case tcell.KeyEnter:
+			return lb.quit(lb.selected)
+		case tcell.KeyEsc:
+			return lb.quit("")
+		}
+	}
+	if lb.filter != nil {
+		handled := lb.filter.Event(event)
+		lb.Invalidate()
+		return handled
+	}
+	return false
+}
+
+func (lb *ListBox) quit(s string) bool {
+	lb.filter.Focus(false)
+	if lb.cb != nil {
+		lb.cb(s)
+	}
+	return true
+}
+
+func (lb *ListBox) Focus(f bool) {
+	lb.filter.Focus(f)
+}