76 lines
2.1 KiB
C#
76 lines
2.1 KiB
C#
using System.ComponentModel;
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using System.Text;
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namespace MAF1.Tools;
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public static class FileTools
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{
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[Description("Read the full UTF-8 text of a local file. Always call this before judging city names.")]
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public static string ReadTextFile([Description("Absolute or relative path of the file to read.")] string path)
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{
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if (string.IsNullOrWhiteSpace(path))
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{
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return "未提供文件路径。";
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}
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string? resolved = Resolve(path.Trim().Trim('"'));
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if (resolved is null)
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{
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return $"找不到文件：{path}";
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}
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FileInfo info = new(resolved);
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if (info.Length > 64 * 1024)
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{
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return $"文件过大（{info.Length} 字节），请换一个不超过 64KB 的文本文件。";
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}
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return File.ReadAllText(resolved, Encoding.UTF8);
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}
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private static string? Resolve(string path)
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{
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if (Path.IsPathRooted(path) && File.Exists(path))
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{
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return Path.GetFullPath(path);
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}
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string fromCwd = Path.GetFullPath(path);
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if (File.Exists(fromCwd))
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{
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return fromCwd;
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}
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foreach (string root in SearchRoots())
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{
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string candidate = Path.GetFullPath(Path.Combine(root, path));
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if (File.Exists(candidate))
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{
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return candidate;
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}
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}
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return null;
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}
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private static IEnumerable<string> SearchRoots()
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{
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yield return AppContext.BaseDirectory;
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string? contentRoot = Environment.GetEnvironmentVariable("MAF1_CONTENT_ROOT");
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if (!string.IsNullOrWhiteSpace(contentRoot))
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{
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yield return contentRoot;
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}
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DirectoryInfo? parent = Directory.GetParent(AppContext.BaseDirectory.TrimEnd(Path.DirectorySeparatorChar));
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if (parent is not null)
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{
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yield return parent.FullName;
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if (parent.Parent is not null)
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{
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yield return parent.Parent.FullName;
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}
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}
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}
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}
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