Initial commit.

.gitignore

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+.vscode/
+debug

README.md

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+# Console Pxls viewer
+
+View a Pxls canvas on the command-line!
+
+## Known bugs
+
+- Windows has fewer, wronger colors
+  - this is due to the library that's used ([termbox-go](https://github.com/nsf/termbox-go/)) not supporting xterm 256 colors at the time of this writing.
+- Mingw on Windows not rendering anything
+  - no idea why this happens
+- Moving horizontally goes twice as fast than moving vertically
+
+## Controls
+
+* Drag your mouse to scroll through the canvas.
+* Use the arrow keys to move faster.
+* Ctrl+C exists.
+
+## Arguments
+
+`--host`: the hostname of the pxls server. Default is "pxls.space"
+
+`--secure`: whether the connection should be secure (use https: and wss: protocols) or insecure (use http: and ws: protocols). Default is true.
+
+---
+
+## Screenshots
+
+Powershell in Windows:
+![Windows, Powershell](images/windows-powershell.gif)
+
+Ubuntu with Xterm color palette (full of visual glitches, but pretty colors)
+![Ubuntu, Terminal (Xterm color palette)](images/ubuntu-xterm.gif)

color_unix.go

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+// +build !windows linux,darwin
+
+package main
+
+import (
+	"github.com/lucasb-eyer/go-colorful"
+	"github.com/nsf/termbox-go"
+)
+
+const termboxXtermOffset = 0x11
+
+// modification of https://github.com/ichinaski/pxl/blob/master/color.go.
+
+// reduceRGB reduces color values to the range [0, 15].
+func reduceRGB(color colorful.Color) (uint16, uint16, uint16) {
+	r, g, b, _ := color.RGBA()
+
+	return uint16(r >> 8), uint16(g >> 8), uint16(b >> 8)
+}
+
+// termColor converts a 24-bit RGB color into a term256 compatible approximation.
+func colorToTermboxAttr(color colorful.Color) termbox.Attribute {
+	r, g, b := reduceRGB(color)
+
+	var (
+		termR = (((r * 5) + 127) / 255) * 36
+		termG = (((g * 5) + 127) / 255) * 6
+		termB = (((b * 5) + 127) / 255)
+	)
+
+	return termbox.Attribute(termR + termG + termB + termboxXtermOffset)
+}

color_windows.go

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+// +build windows
+
+package main
+
+import (
+	"github.com/lucasb-eyer/go-colorful"
+	"github.com/nsf/termbox-go"
+)
+
+// TODO(netux): wait for Termbox to add support for Output256 on Windows.
+var termboxPalette = map[colorful.Color]termbox.Attribute{
+	colorful.Color{R: 0, G: 0, B: 0}: termbox.ColorBlack,
+	colorful.Color{R: 1, G: 0, B: 0}: termbox.ColorRed,
+	colorful.Color{R: 0, G: 1, B: 0}: termbox.ColorGreen,
+	colorful.Color{R: 0, G: 1, B: 0}: termbox.ColorBlue,
+	colorful.Color{R: 1, G: 1, B: 0}: termbox.ColorYellow,
+	colorful.Color{R: 1, G: 0, B: 1}: termbox.ColorMagenta,
+	colorful.Color{R: 0, G: 1, B: 1}: termbox.ColorCyan,
+	colorful.Color{R: 1, G: 1, B: 1}: termbox.ColorWhite,
+}
+
+func colorToTermboxAttr(color colorful.Color) termbox.Attribute {
+	var closest colorful.Color
+	var by float64 = 2
+	for c := range termboxPalette {
+		d := color.DistanceLab(c)
+
+		if d < by {
+			closest = c
+			by = d
+		}
+	}
+
+	return termboxPalette[closest]
+}

go.mod

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+module go-dev.netux.site/shell/pxls-viewer
+
+require (
+	github.com/lucasb-eyer/go-colorful v0.0.0-20181028223441-12d3b2882a08
+	github.com/mattn/go-runewidth v0.0.4 // indirect
+	github.com/nsf/termbox-go v0.0.0-20190121233118-02980233997d
+	golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3
+)

go.sum

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+github.com/lucasb-eyer/go-colorful v0.0.0-20181028223441-12d3b2882a08 h1:5MnxBC15uMxFv5FY/J/8vzyaBiArCOkMdFT9Jsw78iY=
+github.com/lucasb-eyer/go-colorful v0.0.0-20181028223441-12d3b2882a08/go.mod h1:NXg0ArsFk0Y01623LgUqoqcouGDB+PwCCQlrwrG6xJ4=
+github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/nsf/termbox-go v0.0.0-20190121233118-02980233997d h1:x3S6kxmy49zXVVyhcnrFqxvNVCBPb2KZ9hV2RBdS840=
+github.com/nsf/termbox-go v0.0.0-20190121233118-02980233997d/go.mod h1:IuKpRQcYE1Tfu+oAQqaLisqDeXgjyyltCfsaoYN18NQ=
+golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3 h1:ulvT7fqt0yHWzpJwI57MezWnYDVpCAYBVuYst/L+fAY=
+golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=