Initial commit

Author: gen2brain

AUTHORS

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+Milan Nikolic <gen2brain@gmail.com>

COPYING

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+## goiv
+
+Small and simple image viewer written in pure Go.
+
+
+### Features
+
+* Supports JPEG, PNG, GIF, BMP, PCX, TIFF, PBM, PGM, PPM, WEBP, PSD and TGA formats.
+* Scales images to window size and preserves aspect ratio.
+* Supports HTTP URLs passed as arguments
+* Cross-platform (note: on macOS you need to install [XQuartz](https://www.xquartz.org/)).
+
+
+### Download
+
+ - [Linux 64bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-linux-64bit.tar.gz)
+ - [Windows 32bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-windows-32bit.zip)
+ - [macOS 64bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-darwin-64bit.zip)
+
+
+### Installation
+
+    go get -v github.com/gen2brain/goiv
+
+
+This will install app in `$GOPATH/bin/goiv`.
+
+Note: On Windows you need to generate manifest .syso file, use this instead:
+
+    go get github.com/akavel/rsrc
+    
+    go get -d github.com/gen2brain/goiv
+    go generate github.com/gen2brain/goiv
+    go install github.com/gen2brain/goiv
+
+
+### Keybindings
+
+* j / Right / PageDown / Space
+    Next image
+
+* k / Left / PageUp
+    Previous image
+
+* f / F11
+    Fullscreen
+
+* [ / ]
+    Go 10 images back/forward
+
+* , / .
+    Go to first/last image
+
+* q / Escape
+    Quit
+
+* Enter
+    Print current image path to stdout
+
+
+### Example usage
+
+* View all images in a directory
+    goiv /path/to/dir/*
+
+* View all JPEG's in all subdirectories
+    find . -iname "*.jpg" | goiv
+
+* Delete current image when enter is pressed
+    goiv * | xargs rm
+
+* Rotate current image when enter is pressed
+    goiv * | xargs -i convert -rotate 90 {} {}
+
+
+### Planned features
+
+- [ ] draw in console on DRM/KMS and Framebuffer 
+- [ ] flip image vertically/horizontally
+- [ ] rotate image 90 degrees clockwise/counter-clockwise

README.md

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+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	appName    = "goiv"
+	appVersion = "1.0"
+)
+
+func main() {
+	flag.Usage = usage
+
+	width := flag.Int("w", 1024, "Window width")
+	height := flag.Int("h", 768, "Window height")
+	version := flag.Bool("v", false, "Print version and exit")
+	filelist := flag.String("f", "", "Use list of images from file, one per line")
+
+	flag.Parse()
+
+	if *version {
+		fmt.Fprintf(os.Stdout, "%s version %s\n", appName, appVersion)
+		os.Exit(0)
+	}
+
+	args := arguments(flag.Args())
+
+	if *filelist != "" {
+		file, err := os.Open(*filelist)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err.Error())
+			os.Exit(1)
+		}
+
+		ln := lines(file)
+		args = append(args, ln...)
+
+		file.Close()
+	}
+
+	if piped() {
+		ln := lines(os.Stdin)
+		args = append(args, ln...)
+	}
+
+	if len(args) == 0 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	display(args, *width, *height)
+}
+
+// usage prints default usage.
+func usage() {
+	fmt.Fprintf(os.Stderr, "Usage: %s [FILE1 [FILE2 [...]]]\n", appName)
+	fmt.Fprintf(os.Stderr, `
+  -f path
+	Use list of images from file, one per line
+  -w int
+	Window width (default 1024)
+  -h int
+	Window height (default 768)
+  -v
+	Print version and exit
+
+Keybindings:
+
+  j / Right / PageDown / Space
+	Next image
+
+  k / Left / PageUp
+	Previous image
+
+  f / F11
+	Fullscreen
+
+  [ / ]
+	Go 10 images back/forward
+
+  , / .
+	Go to first/last image
+
+  q / Escape
+	Quit
+
+  Enter
+	Print current image path to stdout`)
+	fmt.Fprintf(os.Stderr, "\n")
+}
+
+// arguments returns slice of arguments.
+func arguments(in []string) []string {
+	out := make([]string, 0)
+	for _, arg := range in {
+		if _, err := os.Stat(arg); err == nil {
+			out = append(out, arg)
+		} else {
+			if isURL(arg) {
+				out = append(out, arg)
+			} else {
+				g, err := filepath.Glob(arg)
+				if err == nil {
+					out = append(out, g...)
+				}
+			}
+		}
+	}
+
+	return out
+}
+
+// lines returns slice of lines from reader.
+func lines(r io.Reader) []string {
+	ln := make([]string, 0)
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		ln = append(ln, scanner.Text())
+	}
+
+	return ln
+}
+
+// piped checks if we have a piped stdin.
+func piped() bool {
+	f, err := os.Stdin.Stat()
+	if err != nil {
+		return false
+	}
+
+	if f.Mode()&os.ModeNamedPipe == 0 {
+		return false
+	} else {
+		return true
+	}
+}
+
+// isURL checks if arguments is URL.
+func isURL(arg string) bool {
+	if strings.HasPrefix(arg, "http://") || strings.HasPrefix(arg, "https://") {
+		return true
+	}
+
+	return false
+}

goiv.go

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+// +build darwin
+
+package main
+
+func display(images []string, width, height int) {
+	displayX11(images, width, height)
+}