experimental WIP

this commit experiments with node and edge rendering.

For these I'm trying a Page element with a list of Node and Edge
primitives.

Node primitives are textviews.

Edges are a new, custom primitive.

the edge only draws a line from 0,0 to 5,5 right now but shows that I'm
able to implement a Draw that just writes arbitrary characters to the
screen.

I need to do several things, some of which suggest that i'm abusing the
Pages primitive in terrible ways:

- Add and remove nodes as needed. Pages has no Clear() or Reset(). I
  will have to manually keep track of the page -> node relationship
- Give nodes and edges page names that are unique. I won't really be
  using these and I must avoid collisions.
- Relate edges to nodes somehow so they can be drawn properly
- Ensure that all edges are drawn before all nodes

and a lot more

A tremendous amount of work is ahead but I at least have some basic
stuff proven to be workable.

.gitignore

@@ -0,0 +1,2 @@
+*.swp
+porphyry

go.mod

@@ -0,0 +1,26 @@
+module git.tilde.town/vilmibm/porphyry
+
+go 1.20
+
+require (
+	github.com/AlecAivazis/survey/v2 v2.3.6
+	github.com/gdamore/tcell/v2 v2.6.0
+	github.com/mattn/go-runewidth v0.0.14
+	github.com/spf13/cobra v1.7.0
+)
+
+require (
+	github.com/gdamore/encoding v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.2 // indirect
+	github.com/mattn/go-isatty v0.0.8 // indirect
+	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
+	github.com/rivo/tview v0.0.0-20230530133550-8bd761dda819 // indirect
+	github.com/rivo/uniseg v0.4.3 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	golang.org/x/term v0.5.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+)

go.sum

@@ -0,0 +1,81 @@
+github.com/AlecAivazis/survey/v2 v2.3.6 h1:NvTuVHISgTHEHeBFqt6BHOe4Ny/NwGZr7w+F8S9ziyw=
+github.com/AlecAivazis/survey/v2 v2.3.6/go.mod h1:4AuI9b7RjAR+G7v9+C4YSlX/YL3K3cWNXgWXOhllqvI=
+github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 h1:+vx7roKuyA63nhn5WAunQHLTznkw5W8b1Xc0dNjp83s=
+github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2/go.mod h1:HBCaDeC1lPdgDeDbhX8XFpy1jqjK0IBG8W5K+xYqA0w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
+github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell/v2 v2.6.0 h1:OKbluoP9VYmJwZwq/iLb4BxwKcwGthaa1YNBJIyCySg=
+github.com/gdamore/tcell/v2 v2.6.0/go.mod h1:be9omFATkdr0D9qewWW3d+MEvl5dha+Etb5y65J2H8Y=
+github.com/hinshun/vt10x v0.0.0-20220119200601-820417d04eec h1:qv2VnGeEQHchGaZ/u7lxST/RaJw+cv273q79D81Xbog=
+github.com/hinshun/vt10x v0.0.0-20220119200601-820417d04eec/go.mod h1:Q48J4R4DvxnHolD5P8pOtXigYlRuPLGl6moFx3ulM68=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
+github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b h1:j7+1HpAFS1zy5+Q4qx1fWh90gTKwiN4QCGoY9TWyyO4=
+github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/tview v0.0.0-20230530133550-8bd761dda819 h1:qRMCGgwKl66uWe7Hnzl5bCvZlfrLNIxOx7K00j5XeNc=
+github.com/rivo/tview v0.0.0-20230530133550-8bd761dda819/go.mod h1:nVwGv4MP47T0jvlk7KuTTjjuSmrGO4JF0iaiNt4bufE=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.4.3 h1:utMvzDsuh3suAEnhH0RdHmoPbU648o6CvXxTx4SBMOw=
+github.com/rivo/uniseg v0.4.3/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220422013727-9388b58f7150/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210503060354-a79de5458b56/go.mod h1:tfny5GFUkzUvx4ps4ajbZsCe5lw1metzhBm9T3x7oIY=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0 h1:n2a8QNdAb0sZNpU9R1ALUXBbY+w51fCQDN+7EdxNBsY=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,237 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+	"github.com/spf13/cobra"
+)
+
+type mode string
+
+const (
+	modeNormal mode = "normal"
+	modeFocus  mode = "focus"
+	modeSearch mode = "search"
+	modeEx     mode = "ex"
+)
+
+type UI struct {
+	Mode   mode
+	App    *tview.Application
+	Fields []field
+	Nodes  []node
+
+	// UI things
+	Pages     *tview.Pages
+	TopFlex   *tview.Flex
+	Field     *tview.Pages
+	FieldBar  *tview.Flex
+	BottomBar *tview.Pages
+	ExInput   *tview.InputField
+	ExOutput  *tview.TextView
+}
+
+func (ui *UI) setMode(m mode) {
+	ui.Mode = m
+	switch ui.Mode {
+	case modeNormal:
+		ui.App.SetFocus(ui.TopFlex)
+		ui.ExInput.SetText("")
+	case modeEx:
+		ui.App.SetFocus(ui.ExInput)
+	}
+}
+
+func (ui *UI) handleInput(event *tcell.EventKey) *tcell.EventKey {
+	switch ui.Mode {
+	case modeNormal:
+		switch event.Rune() {
+		case ':':
+			ui.setMode(modeEx)
+			return nil
+		}
+	case modeEx:
+	case modeFocus:
+	case modeSearch:
+	default:
+		panic("mode?")
+	}
+	return event
+}
+
+func (ui *UI) handleExInput(key tcell.Key) {
+	text := ui.ExInput.GetText()
+	ui.setMode(modeNormal)
+
+	if key != tcell.KeyEnter {
+		return
+	}
+
+	switch text {
+	case "q", "quit":
+		ui.quit()
+	}
+
+	ui.ExOutput.SetText("")
+	fmt.Fprintf(ui.ExOutput, "did not understand '%s', sorry", text)
+}
+
+type field struct {
+	Name     string
+	Selected bool
+}
+
+type node struct {
+	Text  string
+	Edges []*node
+	X     int
+	Y     int
+}
+
+type Edge struct {
+}
+
+func (e Edge) Draw(screen tcell.Screen) {
+	screen.SetContent(0, 0, '!', []rune{}, tcell.StyleDefault)
+}
+
+func (e Edge) GetRect() (int, int, int, int) {
+	return 0, 0, 0, 0
+}
+
+func (e Edge) SetRect(x, y, width, height int) {
+}
+
+func (e Edge) InputHandler() func(_ *tcell.EventKey, _ func(p tview.Primitive)) {
+	return func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {}
+}
+
+func (e Edge) HasFocus() bool {
+	return false
+}
+
+func (e Edge) Focus(delegate func(p tview.Primitive)) {
+}
+
+func (e Edge) Blur() {
+}
+
+func (e Edge) MouseHandler() func(action tview.MouseAction, event *tcell.EventMouse, setFocus func(p tview.Primitive)) (consumed bool, capture tview.Primitive) {
+	return func(action tview.MouseAction, event *tcell.EventMouse, setFocus func(p tview.Primitive)) (consumed bool, capture tview.Primitive) {
+		return false, nil
+	}
+}
+
+func NewUI() *UI {
+	app := tview.NewApplication()
+	ui := UI{
+		Mode:      modeNormal,
+		App:       app,
+		Fields:    []field{{"scratch", true}, {"test", false}},
+		Nodes:     []node{},
+		Pages:     tview.NewPages(),
+		TopFlex:   tview.NewFlex(),
+		Field:     tview.NewPages(),
+		FieldBar:  tview.NewFlex(),
+		BottomBar: tview.NewPages(),
+		ExInput:   tview.NewInputField(),
+		ExOutput:  tview.NewTextView(),
+	}
+
+	app.SetInputCapture(ui.handleInput)
+
+	ui.TopFlex.SetDirection(tview.FlexRow)
+	ui.TopFlex.AddItem(ui.Field, 0, 20, true)
+	ui.TopFlex.AddItem(ui.FieldBar, 0, 1, false)
+	ui.TopFlex.AddItem(ui.BottomBar, 0, 1, false)
+
+	ui.Pages.AddPage("main", ui.TopFlex, true, true)
+
+	ui.BottomBar.AddPage("output", ui.ExOutput, true, true)
+	ui.BottomBar.AddPage("input", ui.ExInput, true, false)
+
+	ui.ExInput.SetLabel(":")
+	ui.ExInput.SetDoneFunc(ui.handleExInput)
+
+	ui.ExOutput.SetMaxLines(1)
+	fmt.Fprintf(ui.ExOutput, "porphyry has started. :q to quit")
+
+	ui.FieldBar.SetDirection(tview.FlexColumn)
+
+	ui.Nodes = append(ui.Nodes, node{
+		Text: "foobar\nbaz\nquux",
+	})
+	ui.Nodes = append(ui.Nodes, node{
+		Text: "hello\nthere\nhow",
+	})
+
+	x := 0
+	y := 0
+
+	rand.Seed(time.Now().Unix())
+
+	for _, n := range ui.Nodes {
+		b := tview.NewTextView()
+		b.SetText(n.Text)
+		b.SetBorder(true)
+		b.SetRect(x, y, 10, 5)
+		x += 20
+		ui.Field.AddPage(fmt.Sprintf("%d", rand.Intn(10000)), b, false, true)
+	}
+
+	ui.Field.AddPage("edge", Edge{}, false, true)
+
+	app.SetBeforeDrawFunc(func(_ tcell.Screen) bool {
+		// Handle nodes
+		// TODO
+
+		// Handle field bar
+		ui.FieldBar.Clear()
+
+		for _, f := range ui.Fields {
+			t := tview.NewTextView().SetTextStyle(tcell.StyleDefault.Bold(f.Selected))
+			t.SetMaxLines(1)
+			t.SetBorder(true)
+			fmt.Fprintf(t, f.Name)
+			ui.FieldBar.AddItem(t, 0, 1, false)
+		}
+
+		// Handle ex mode prompt
+
+		if ui.Mode == modeEx {
+			ui.BottomBar.SwitchToPage("input")
+		} else {
+			ui.BottomBar.SwitchToPage("output")
+		}
+		return false
+	})
+
+	app.SetRoot(ui.Pages, true)
+	return &ui
+}
+
+func (ui *UI) quit() {
+	ui.App.Stop()
+}
+
+func _main() error {
+	cmd := &cobra.Command{
+		Use: "porphyry",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return NewUI().App.Run()
+		},
+	}
+
+	return cmd.Execute()
+}
+
+func main() {
+	if err := _main(); err != nil {
+		fmt.Fprintf(os.Stderr, err.Error()+"\n")
+	}
+}