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771 lines
18 KiB
771 lines
18 KiB
// SPDX-License-Identifier: GPL-3.0-or-later
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// Package main is the command-line entrypoint for the distribusi command.
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package main
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"image/png"
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"io"
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"io/fs"
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"io/ioutil"
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"net/http"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"time"
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logrusStack "github.com/Gurpartap/logrus-stack"
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"github.com/barasher/go-exiftool"
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"github.com/disintegration/imaging"
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"github.com/gabriel-vasile/mimetype"
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"github.com/k0kubun/go-ansi"
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"github.com/schollz/progressbar/v3"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli/v2"
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)
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// Version is the current version of distribusi-go
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var Version string
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// Commit is the current commit of distribusi-go
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var Commit string
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// port is the web server port
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var port = ":3000"
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// exiftooInstalled tells us if the exiftool binary is installed or not.
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var exiftoolInstalled = true
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// generatedInDistribusi is an internal marker to help recognise when
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// distribusi-go has generated files.
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var generatedInDistribusi = "<meta name='generator' content='distribusi-go' />"
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// htmlBody is the template for the index.html files that are generated by distribusi-go.
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var htmlBody = `
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<!-- Generated with distribusi-go https://git.vvvvvvaria.org/decentral1se/distribusi-go -->
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%s
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<style>
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.image {
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max-width: 100%%;
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}
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.pdf {
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width: 640px;
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height: 640px;
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}
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.os::before {
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content: "📁 ";
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font-size: 18px;
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}
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.filename {
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display: block;
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font-family: mono;
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}
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.gif {
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width: 450px;
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max-height: 450px;
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}
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div {
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display: inline-block;
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vertical-align: top;
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margin: 1em;
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padding: 1em;
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}
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video {
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width: 450px;
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max-height: 450px;
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}
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%s
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</style>
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</head>
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<body>
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%s
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</body>
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</html
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`
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// main is the command-line entrypoint.
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func main() {
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if Version == "" {
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Version = "dev"
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}
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if Commit == "" {
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Commit = " "
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}
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app := &cli.App{
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Name: "distribusi-go",
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Version: fmt.Sprintf("%s-%s", Version, Commit[:7]),
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Usage: "low-tech content management system for the web",
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Description: `
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Distribusi is a content management system for the web that produces static
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index pages based on folders in the files system. It is inspired by the
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automatic index functions featured in several popular web servers. Distribusi
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works by traversing the file system and directory hierarchy to automatically
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list all the files in the directory, detect the file types and providing them
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with relevant html classes and tags for easy styling.
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Example:
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distribusi -p <path> -s
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`,
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "css",
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Aliases: []string{"c"},
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Usage: "css file for custom styles",
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Value: "",
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},
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&cli.BoolFlag{
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Name: "debug",
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Aliases: []string{"d"},
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Usage: "debug logging",
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Value: false,
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},
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&cli.BoolFlag{
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Name: "hidden",
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Aliases: []string{"n"},
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Usage: "include hidden directories (e.g. .git)",
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Value: false,
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},
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&cli.StringFlag{
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Name: "ignore",
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Aliases: []string{"i"},
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Usage: "ignore specific paths, (e.g. \"*.gif, *.txt, mydir\" )",
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Value: "",
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},
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&cli.StringFlag{
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Name: "path",
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Aliases: []string{"p"},
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Usage: "path to distribusify",
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Required: true,
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},
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&cli.BoolFlag{
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Name: "serve",
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Aliases: []string{"s"},
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Usage: "serve distribusi for the web",
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Value: false,
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},
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&cli.BoolFlag{
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Name: "wipe",
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Aliases: []string{"w"},
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Usage: "remove all generated files",
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Value: false,
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},
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},
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Authors: []*cli.Author{
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{
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Name: "Varia & friends",
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Email: "info@varia.zone",
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},
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},
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Before: func(c *cli.Context) error {
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if c.Bool("debug") {
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logrus.SetLevel(logrus.DebugLevel)
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logrus.SetFormatter(&logrus.TextFormatter{})
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logFile, err := getLogFile()
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if err != nil {
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logrus.Fatalf("unable to set up a log file, saw: %s", err)
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}
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logrus.SetOutput(io.MultiWriter(os.Stderr, logFile))
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logrus.RegisterExitHandler(func() {
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if logFile == nil {
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return
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}
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logFile.Close()
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})
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logrus.AddHook(logrusStack.StandardHook())
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}
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return nil
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},
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Action: func(c *cli.Context) error {
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root, err := filepath.Abs(c.String("path"))
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if err != nil {
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logrus.Fatal(err)
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}
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logrus.Debugf("selecting %s as distribusi root", root)
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var ignore []string
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if c.String("ignore") != "" {
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ignore = strings.Split(c.String("ignore"), ",")
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for i := range ignore {
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ignore[i] = strings.TrimSpace(ignore[i])
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}
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logrus.Debugf("parsed %s as ignore patterns", strings.Join(ignore, " "))
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}
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if c.Bool("wipe") {
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if err := wipeGeneratedFiles(root); err != nil {
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logrus.Fatal(err)
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}
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logrus.Infof("wiped all generated files in %s", root)
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return nil
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}
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_, err = exec.LookPath("exiftool")
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if err != nil {
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logrus.Debug("exiftool is not installed, skipping image captions")
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exiftoolInstalled = false
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}
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ch := make(chan error, 2)
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go func() {
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if err := distribusify(c, root, ignore); err != nil {
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ch <- err
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return
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}
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fmt.Printf("done!")
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ch <- nil
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return
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}()
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if c.Bool("serve") {
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go func() {
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logrus.Debug("starting up web server")
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if err := serveHTTP(root); err != nil {
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ch <- err
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return
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}
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ch <- nil
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return
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}()
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}
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for i := 1; i <= 2; i++ {
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err := <-ch
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if err != nil {
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logrus.Fatal(err)
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}
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}
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return nil
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},
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}
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sort.Sort(cli.FlagsByName(app.Flags))
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sort.Sort(cli.CommandsByName(app.Commands))
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if err := app.Run(os.Args); err != nil {
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logrus.Fatal(err)
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}
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}
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// distribusify runs the main distribusi generation logic.
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func distribusify(c *cli.Context, root string, ignore []string) error {
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var allDirs []string
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progress := mkProgressBar()
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if err := filepath.Walk(root, func(fpath string, finfo os.FileInfo, err error) error {
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skip, err := shouldSkip(c, fpath, ignore)
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if err != nil {
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return err
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}
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if skip {
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return nil
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}
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var html []string
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if finfo.IsDir() {
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var dirs []string
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var files []string
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absPath, err := filepath.Abs(fpath)
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if err != nil {
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logrus.Debugf("unable to read %s", absPath)
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return nil
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}
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contents, err := ioutil.ReadDir(absPath)
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if err != nil {
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logrus.Debugf("unable to read %s", absPath)
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return nil
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}
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for _, content := range contents {
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if content.IsDir() {
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dirs = append(dirs, path.Join(absPath, content.Name()))
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} else {
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if content.Name() == "index.html" {
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indexPath := path.Join(absPath, content.Name())
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file, err := os.ReadFile(indexPath)
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if err != nil {
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logrus.Debugf("unable to read %s, skipping", content.Name())
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continue
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}
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if strings.Contains(string(file), generatedInDistribusi) {
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logrus.Debugf("%s was not generated by distribusi, skipping", indexPath)
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continue
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}
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}
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files = append(files, path.Join(absPath, content.Name()))
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}
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}
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if len(dirs) == 0 && len(files) == 0 {
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return nil
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}
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if root != fpath {
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href := "<a href='../'>../</a>"
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div, err := mkDiv(c, "os/directory", href, "menu", false)
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if err != nil {
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return err
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}
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html = append(html, div)
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}
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for _, dir := range dirs {
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fname := filepath.Base(dir)
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skip, err := shouldSkip(c, fname, ignore)
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if err != nil {
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return err
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}
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if skip {
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continue
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}
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mtype := "os/directory"
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href := fmt.Sprintf("<a href='%s'>%s/</a>", fname, fname)
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div, err := mkDiv(c, mtype, href, fname, false)
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if err != nil {
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return err
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}
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html = append(html, div)
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progress.Add(1)
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}
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for _, file := range files {
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fname := filepath.Base(file)
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skip, err := shouldSkip(c, fname, ignore)
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if err != nil {
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return err
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}
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if skip {
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continue
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}
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mtype, err := getMtype(file)
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if err != nil {
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logrus.Debugf("failed to read mimetype of %s", file)
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continue
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}
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unknown, href, err := getHref(c, file, mtype)
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if err != nil {
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logrus.Debugf("failed to generate href for %s", file)
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continue
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}
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div, err := mkDiv(c, mtype, href, fname, unknown)
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if err != nil {
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logrus.Debugf("failed to generate div for %s", file)
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continue
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}
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html = append(html, div)
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progress.Add(1)
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}
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if err := writeIndex(absPath, html, c.String("css")); err != nil {
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logrus.Debugf("unable to generated %s, skipping", path.Join(absPath, "index.html"))
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return nil
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}
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allDirs = append(allDirs, strings.Join(dirs, " "))
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}
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return nil
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}); err != nil {
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return err
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}
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logrus.Debugf("generated files in following paths: %s", strings.Join(allDirs, " "))
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return nil
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}
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// removeIndex safely removes an index.html, making sure to check that
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// distribusi generated it.
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func removeIndex(fpath string) error {
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file, err := os.ReadFile(fpath)
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if err != nil {
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return err
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}
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if strings.Contains(string(file), generatedInDistribusi) {
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if err := os.Remove(fpath); err != nil {
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return err
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}
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return nil
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}
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return nil
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}
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// getMtype determines file mimetype which helps to arrange HTML tags
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// appropriate for the file type.
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func getMtype(fpath string) (string, error) {
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mtype, err := mimetype.DetectFile(fpath)
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if err != nil {
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return "", err
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}
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return mtype.String(), nil
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}
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// genThumb generates an in-memory image thumbnail and encodes it into a base64
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// representation which is suitable for embedding in HTML pages.
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func genThumb(c *cli.Context, fpath, caption string) (string, error) {
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imgSrc, err := imaging.Open(fpath, imaging.AutoOrientation(true))
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if err != nil {
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return "", err
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}
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img := imaging.Thumbnail(imgSrc, 450, 450, imaging.Lanczos)
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buf := new(bytes.Buffer)
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png.Encode(buf, img)
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imgBase64Str := base64.StdEncoding.EncodeToString(buf.Bytes())
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logrus.Debugf("successfully generated thumbnail for %s", fpath)
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return imgBase64Str, nil
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}
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// getCaption retrieves an embedded image caption via exif-tool. If not
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// exiftool is installed, we gracefully bail out. The caller is responsible for
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// handling the alternative.
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func getCaption(c *cli.Context, fpath string) (string, error) {
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var caption string
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if !exiftoolInstalled {
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return "", nil
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}
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exif, err := exiftool.NewExiftool()
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if err != nil {
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return caption, fmt.Errorf("failed to initialise exiftool, saw %v", err)
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}
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defer exif.Close()
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for _, finfo := range exif.ExtractMetadata(fpath) {
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if finfo.Err != nil {
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continue
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}
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for k, v := range finfo.Fields {
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if k == "Comment" {
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caption = fmt.Sprintf("%v", v)
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}
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}
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}
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if caption != "" {
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logrus.Debugf("retrieved caption %s from %s", caption, fpath)
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} else {
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logrus.Debugf("no comment retrieved for %s", fpath)
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}
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return caption, nil
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}
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// parseMtype parses a mimetype string to simplify programmatic type lookups.
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func parseMtype(mtype string) (string, string) {
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stripCharset := strings.Split(mtype, ";")
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splitTypes := strings.Split(stripCharset[0], "/")
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ftype, stype := splitTypes[0], splitTypes[1]
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return ftype, stype
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}
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// sliceContains checks if an element is present in a list.
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func sliceContains(items []string, target string) bool {
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for _, item := range items {
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if item == target {
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return true
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}
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}
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return false
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}
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// trimFinalNewline trims newlines from the end of bytes just read from files.
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func trimFinalNewline(contents []byte) string {
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return strings.TrimSuffix(string(contents), "\n")
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}
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// getHref figures out which href tag corresponds to which file by navigating
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// the mimetype. If a type of file is unknown, this is signalled via the bool
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// return value.
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func getHref(c *cli.Context, fpath string, mtype string) (bool, string, error) {
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var href string
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var unknown bool
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fname := filepath.Base(fpath)
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ftype, stype := parseMtype(mtype)
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if ftype == "text" {
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fcontents, err := os.ReadFile(fpath)
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if err != nil {
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return unknown, href, err
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}
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if stype == "html" {
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href = fmt.Sprintf("<section id=\"%s\">%s</section>", fname, trimFinalNewline(fcontents))
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} else {
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href = fmt.Sprintf("<pre>%s</pre>", trimFinalNewline(fcontents))
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}
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} else if ftype == "image" {
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var caption string
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exifCaption, err := getCaption(c, fpath)
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if err != nil {
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return unknown, href, nil
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}
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if exifCaption != "" {
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caption = exifCaption
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}
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if stype == "gif" {
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href = fmt.Sprintf("<img class='gif' loading='lazy' src=\"%s\" />", fname)
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} else {
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thumb, err := genThumb(c, fpath, caption)
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if err != nil {
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logrus.Debugf("failed to generate thumbnail for %s, showing original image", fpath)
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href = fmt.Sprintf("<img class='%s' loading='lazy' src=\"%s\" />", stype, fname)
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} else {
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href = fmt.Sprintf(
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"<figure><a href=\"%s\"><img class='thumbnail' src='data:image/jpg;base64,%s'></a><figcaption>%s</figcaption></figure>",
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fname, thumb, caption,
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)
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}
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}
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} else if ftype == "application" {
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if stype == "pdf" {
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href = fmt.Sprintf("<object data=\"%s\" class='pdf' type='application/pdf'><embed src=\"%s\" type='application/pdf'/></object>", fname, fname)
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} else {
|
|
unknown = true
|
|
href = fmt.Sprintf("<a class='%s' href=\"%s\">%s</a>", stype, fname, fname)
|
|
}
|
|
} else if ftype == "audio" {
|
|
href = fmt.Sprintf("<audio controls> <source src=\"%s\" type='audio/%s'> Your browser does not support the audio element. </audio>", fname, stype)
|
|
} else if ftype == "video" {
|
|
href = fmt.Sprintf("<video controls> <source src=\"%s\" type='video/%s'> </video>", fname, stype)
|
|
} else {
|
|
unknown = true
|
|
href = fmt.Sprintf("<a class='%s' href=\"%s\">%s</a>", stype, fname, fname)
|
|
}
|
|
|
|
logrus.Debugf("generated href for %s: %s", fname, href)
|
|
|
|
return unknown, href, nil
|
|
}
|
|
|
|
// mkDiv cosntructs a HTML div for inclusion in the generated index.html.
|
|
func mkDiv(c *cli.Context, mtype string, href, fname string, unknown bool) (string, error) {
|
|
var div string
|
|
|
|
filename := fmt.Sprintf("<span class='filename'>%s</span>", fname)
|
|
|
|
ftype, _ := parseMtype(mtype)
|
|
|
|
if ftype == "text" {
|
|
div = fmt.Sprintf("<div id=\"%s\" class='%s'>%s%s</div>", fname, ftype, href, filename)
|
|
} else if ftype == "os" {
|
|
div = fmt.Sprintf("<div id=\"%s\" class='%s'>%s</div>", fname, ftype, href)
|
|
} else {
|
|
if unknown {
|
|
// we really don't know what this is, so the filename is the href and we avoid adding it again
|
|
div = fmt.Sprintf("<div id=\"%s\" class='%s'>%s</div>", fname, ftype, href)
|
|
} else {
|
|
// images, videos, etc. still get a filename
|
|
div = fmt.Sprintf("<div id=\"%s\" class='%s'>%s%s</div>", fname, ftype, href, filename)
|
|
}
|
|
}
|
|
|
|
logrus.Debugf("generated div wrapper for %s: %s", fname, div)
|
|
|
|
return div, nil
|
|
}
|
|
|
|
// writeIndex writes a new index.html.
|
|
func writeIndex(fpath string, html []string, styles string) error {
|
|
body := fmt.Sprintf(htmlBody, generatedInDistribusi, "", strings.Join(html, "\n"))
|
|
|
|
if styles != "" {
|
|
absPath, err := filepath.Abs(styles)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if _, err := os.Stat(absPath); !os.IsNotExist(err) {
|
|
contents, err := os.ReadFile(absPath)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
logrus.Debugf("loading custom styles from %s", absPath)
|
|
|
|
body = fmt.Sprintf(htmlBody, generatedInDistribusi, contents, strings.Join(html, "\n"))
|
|
}
|
|
}
|
|
|
|
HTMLPath := path.Join(fpath, "index.html")
|
|
contents := []byte(body)
|
|
|
|
if _, err := os.Stat(HTMLPath); err != nil {
|
|
if os.IsNotExist(err) {
|
|
if err := ioutil.WriteFile(HTMLPath, contents, 0644); err != nil {
|
|
logrus.Debugf("unable to write %s, skipping", HTMLPath)
|
|
return nil
|
|
}
|
|
} else {
|
|
logrus.Debugf("unable to read %s, skipping", HTMLPath)
|
|
return nil
|
|
}
|
|
} else {
|
|
file, err := os.ReadFile(HTMLPath)
|
|
if err != nil {
|
|
logrus.Debugf("unable to read %s, skipping", HTMLPath)
|
|
return nil
|
|
}
|
|
|
|
if strings.Contains(string(file), generatedInDistribusi) {
|
|
if err := ioutil.WriteFile(HTMLPath, contents, 0644); err != nil {
|
|
logrus.Debugf("unable to write %s, skipping", HTMLPath)
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// serveHTTP serves a web server for browsing distribusi.
|
|
func serveHTTP(fpath string) error {
|
|
fs := http.FileServer(http.Dir(fpath))
|
|
http.Handle("/", fs)
|
|
|
|
logrus.Infof("distribusi serving from http://localhost%s", port)
|
|
|
|
if err := http.ListenAndServe(port, nil); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// wipeGeneratedFiles removes all distribusi generated files.
|
|
func wipeGeneratedFiles(dir string) error {
|
|
if err := filepath.WalkDir(dir, func(fpath string, dirEntry fs.DirEntry, err error) error {
|
|
fname := filepath.Base(fpath)
|
|
if fname == "index.html" {
|
|
if err := removeIndex(fpath); err != nil {
|
|
return err
|
|
}
|
|
logrus.Debugf("wiping %s as requested", fpath)
|
|
}
|
|
return nil
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// shouldSkip checks if paths should be skipped over.
|
|
func shouldSkip(c *cli.Context, fpath string, ignore []string) (bool, error) {
|
|
for _, pattern := range ignore {
|
|
match, err := filepath.Match(pattern, filepath.Base(fpath))
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if match {
|
|
logrus.Debugf("skipping %s, matched %s", filepath.Base(fpath), pattern)
|
|
return true, nil
|
|
}
|
|
}
|
|
|
|
fpaths := strings.Split(fpath, "/")
|
|
for _, part := range fpaths {
|
|
if strings.HasPrefix(part, ".") {
|
|
if !c.Bool("hidden") {
|
|
logrus.Debugf("skipping %s, hidden directory", fpath)
|
|
return true, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return false, nil
|
|
}
|
|
|
|
// getLogFile creates a new log file for debug output.
|
|
func getLogFile() (*os.File, error) {
|
|
cTime := time.Now()
|
|
timeNow := fmt.Sprintf("%v-%v-%v", cTime.Hour(), cTime.Minute(), cTime.Second())
|
|
prefix := fmt.Sprintf("distribusi-go-%s", timeNow)
|
|
|
|
file, err := ioutil.TempFile("/tmp", prefix)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
logrus.Debugf("creating %s as debug log file", file.Name())
|
|
|
|
return file, nil
|
|
}
|
|
|
|
// mkProgressBar creates a progress bar.
|
|
func mkProgressBar() *progressbar.ProgressBar {
|
|
bar := progressbar.NewOptions(-1,
|
|
progressbar.OptionSetDescription("distribusifying..."),
|
|
progressbar.OptionSetWriter(ansi.NewAnsiStdout()),
|
|
progressbar.OptionEnableColorCodes(true),
|
|
progressbar.OptionShowCount(),
|
|
progressbar.OptionSpinnerType(9),
|
|
)
|
|
return bar
|
|
}
|
|
|