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decrypt PathExtensions IsAbsolute and MakeAbsolute

This commit is contained in:
zeromus 2021-05-27 16:51:31 -04:00
parent 7c17f31cdc
commit d39fa5d3d1
1 changed files with 29 additions and 12 deletions
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41
src/BizHawk.Common/Extensions/PathExtensions.cs
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@ -52,15 +52,22 @@ namespace BizHawk.Common.PathExtensions
/// <seealso cref="IsRelative"/>
public static bool IsAbsolute(this string path)
{
//TODO: this code must be deleted. We can't use bespoke logic for something as squirrely as this. Find a framework way to do it.
if (OSTailoredCode.IsUnixHost) return path.Length >= 1 && path[0] == '/';
if (path.Contains('/')) return IsAbsolute(path.Replace('/', '\\'));
return path.Length >= 3
&& path[2] switch
{
'\\' => path[1] == '\\' && ('A'.RangeTo('Z').Contains(path[0]) || 'a'.RangeTo('z').Contains(path[0])),
'?' => path.StartsWith(@"\\?\"),
_ => false
};
if (path.Length < 3)
return false;
if (path[2] == '\\')
{
if (path[1] != '\\')
return false;
bool driveLetter = ('A'.RangeTo('Z').Contains(path[0]) || 'a'.RangeTo('z').Contains(path[0]));
return driveLetter;
}
if (path[2] == '?')
return path.StartsWith(@"\\?\");
return false;
}
/// <returns><see langword="false"/> iff absolute (OS-dependent)</returns>
@ -105,16 +112,26 @@ namespace BizHawk.Common.PathExtensions
return Win32Imports.PathRelativePathTo(path, fromPath, GetPathAttribute(fromPath), toPath, GetPathAttribute(toPath))
? path.ToString()
: throw new ArgumentException("Paths must have a common prefix");
}
}
/// <returns>absolute path (OS-dependent) equivalent to <paramref name="path"/></returns>
/// <remarks>
/// unless <paramref name="cwd"/> is given, uses <see cref="CWDHacks.Get">CWDHacks.Get</see>/<see cref="Environment.CurrentDirectory">Environment.CurrentDirectory</see>,
/// so take care when calling this after startup
/// </remarks>
public static string MakeAbsolute(this string path, string? cwd = null) => path.IsAbsolute()
? path
: new FileInfo($"{cwd ?? (OSTailoredCode.IsUnixHost ? Environment.CurrentDirectory : CWDHacks.Get())}/{path}").FullName; // FileInfo for normalisation ("C:\a\b\..\c" => "C:\a\c")
public static string MakeAbsolute(this string path, string? cwd = null)
{
if (path.IsAbsolute())
return path;
else
{
// FileInfo for normalisation ("C:\a\b\..\c" => "C:\a\c")
var mycwd = cwd ?? (OSTailoredCode.IsUnixHost ? Environment.CurrentDirectory : CWDHacks.Get());
var finalpath = $"{mycwd}/{path}";
var fi = new FileInfo(finalpath);
return fi.FullName;
}
}
/// <returns>the absolute path equivalent to <paramref name="path"/> which contains <c>%exe%</c> (expanded) as a prefix</returns>
/// <remarks>