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Utils.cs
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Utils.cs
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using DotNet.Globbing;
using Microsoft.Win32;
using System.Diagnostics;
using System.Linq;
namespace Searcher;
/// <summary>
/// Result of a search
/// </summary>
public enum SearchResult { Found, NotFound, Error }
/// <summary>
/// A single search result
/// </summary>
public readonly record struct SingleResult(string Path, SearchResult Result);
internal static class Utils
{
private const string TextFileOpener = "notepad.exe";
private static ReadOnlySpan<byte> MagicNumberZip => [0x50, 0x4B, 0x03, 0x04];
private static ReadOnlySpan<string> TextFileTypes => new string[] { ".txt", ".log", ".md", ".cs", ".rs", ".js", ".html" };
private static ReadOnlySpan<string> WordFileTypes => new string[] { ".docx", ".doc", ".rtf" };
private static readonly Lazy<string> pathToWord = new(GetWordPath);
private static readonly Lazy<string> AcrobatPath = new(() => GetProgramPath("Acrobat.exe") ?? GetProgramPath("AcroRd32.exe") ?? string.Empty);
/// <summary>
/// Calculate a reasonable update rate, from 1 to 201 items
/// </summary>
public static int CalculateModulo(int count)
{
int modulo;
if (count < 100) {
return 1; // small number of files, so update progress bar every check
} else {
modulo = count / 100; // 100 or more files, so update progress bar every 1% of files
}
// keep the updates between 1 and 201 items
if (modulo < 1) {
return 1;
}
if (modulo > 201) {
return 201;
}
return modulo;
}
/// <summary>
/// Check the magic number of a file to see if it is a zip archive
/// </summary>
public static bool IsZipArchive(string filePath)
{
try {
Span<byte> fileBytes = stackalloc byte[MagicNumberZip.Length];
using var file = new FileStream(filePath, FileMode.Open, FileAccess.Read);
_ = file.Read(fileBytes);
return fileBytes.SequenceEqual(MagicNumberZip);
}
catch (Exception) {
// some error in the zip file
return false;
}
}
/// <summary>
/// Open a file using the default program for that file type
/// </summary>
public static void OpenFile(string path, CliOptions options)
{
var opener = string.IsNullOrEmpty(options.OpenWith) ? TextFileOpener : options.OpenWith;
var extension = Path.GetExtension(path).ToLower();
path = $"\"{path}\""; // the quotes are needed if the path has spaces, in some cases
if (TextFileTypes.Contains(extension)) {
_ = Process.Start(opener, path);
} else if (WordFileTypes.Contains(extension)) {
_ = Process.Start(pathToWord.Value, path);
} else if (extension == ".zip") {
_ = Process.Start("explorer.exe", path);
} else if (extension == ".pdf") {
StartAcrobat(path);
} else {
// Open file using default program
//_ = Process.Start(path);
_ = Process.Start(opener, path);
}
}
/// <summary>
/// On my system Acrobat doesnt start automatically, so I need this
/// </summary>
private static void StartAcrobat(string path)
{
if (string.IsNullOrEmpty(AcrobatPath.Value)) {
_ = Process.Start(path); // fallback
} else {
_ = Process.Start(AcrobatPath.Value, path);
}
}
/// <summary>
/// Use the registry to find the path to MS Word, or a hardcoded path if not found
/// </summary>
private static string GetWordPath()
{
const string keyName = @"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\Winword.exe";
var winwordPath = (string?)Registry.GetValue(keyName, "Path", null);
if (winwordPath == null) {
return "C:\\Program Files\\Microsoft Office\\root\\Office16\\winword.exe";
} else {
return Path.Combine(winwordPath, "Winword.exe");
}
}
/// <summary>
/// Look in the registry to see if we can locate the path to the program
/// </summary>
public static string? GetProgramPath(string program)
{
var keyName = $"HKEY_CLASSES_ROOT\\Applications\\{program}\\shell\\Open\\command";
var appPath = (string?)Registry.GetValue(keyName, null, null);
if (appPath == null) {
return null;
}
// may be something like
// "C:\Program Files\Adobe\Acrobat DC\Acrobat\Acrobat.exe" "%1"
// so we need to remove the quotes and the "%1"
appPath = appPath.Replace("\"", "")
.Replace("%1", "")
.Trim();
if (!File.Exists(appPath)) {
return null;
} else {
return appPath;
}
}
/// <summary>
/// take the provided patterns, and add *.zip if needed. This is used for searching for files outside zips
/// </summary>
public static IReadOnlyList<Glob> ProcessOuterPatterns(IReadOnlyList<string> patterns, bool includezips)
{
var needzip = false;
if (includezips) {
needzip = !patterns.Any(pat => string.Equals(pat, "*.zip", CliOptions.FilenameComparison));
}
var results = patterns
.Select(pat => Glob.Parse(pat))
.ToList();
if (needzip) {
results.Add(Glob.Parse("*.zip"));
}
return results;
}
/// <summary>
/// take the provided patterns, and add *.zip if needed. This is used for searching for files outside zips
/// </summary>
public static IReadOnlyList<string> ProcessOuterPatternsOld(IList<string> p, bool includezips)
{
// *.doc, *.txt => *.doc, *.txt, *.zip
var haszip = false;
// duplicate the list of patterns
var copyPatterns = new List<string>(p.Count + 1);
foreach (var pattern in p) {
copyPatterns.Add(pattern);
if (string.Equals(pattern, "*.zip", CliOptions.FilenameComparison)) {
haszip = true;
}
}
// if we need to, add the zip pattern
if (includezips && !haszip) {
copyPatterns.Add("*.zip");
}
return copyPatterns;
}
/// <summary>
/// This is used for searching for files inside zips, and returns globs
/// </summary>
public static IReadOnlyList<Glob> ProcessInnerPatterns(IReadOnlyList<string> patterns)
{
return patterns.Where(pat => !pat.EndsWith(".zip", CliOptions.FilenameComparison))
.Select(pat => Glob.Parse(pat))
.ToList();
}
}
/// <summary>
/// Extension methods for List Views
/// </summary>
public static class ListViewExtensions
{
// https://stackoverflow.com/questions/442817/c-sharp-flickering-listview-on-update
/// <summary>
/// Sets the double buffered property of a list view to the specified value
/// </summary>
/// <param name="listView">The List view</param>
/// <param name="doubleBuffered">Double Buffered or not</param>
public static void SetDoubleBuffered(this System.Windows.Forms.ListView listView, bool doubleBuffered = true) =>
listView?.GetType().GetProperty("DoubleBuffered", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic)?.SetValue(listView, doubleBuffered, null);
}