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C#: Address review comments

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This commit is contained in:
Tom Hvitved
2019-01-04 11:32:23 +01:00
parent 412248c77f
commit c962f55cd0
2 changed files with 12 additions and 10 deletions
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18
csharp/extractor/Semmle.Util/FileUtils.cs
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@@ -54,27 +54,29 @@ namespace Semmle.Util
}
/// <summary>
/// Finds the path for the executable <paramref name="exe"/> based on the
/// Finds the path for the program <paramref name="prog"/> based on the
/// <code>PATH</code> environment variable, and in the case of Windows the
/// <code>PATHEXT</code> environment variable.
///
/// Returns <code>null</code> of no path can be found.
/// </summary>
public static string FindExecutableOnPath(string exe)
public static string FindProgramOnPath(string prog)
{
var paths = Environment.GetEnvironmentVariable("PATH").Split(Path.PathSeparator);
var paths = Environment.GetEnvironmentVariable("PATH")?.Split(Path.PathSeparator);
string[] exes;
if (Win32.IsWindows())
{
var extensions = Environment.GetEnvironmentVariable("PATHEXT").Split(';').ToArray();
exes = extensions.Any(exe.EndsWith) ? new[] { exe } : extensions.Select(ext => exe + ext).ToArray();
var extensions = Environment.GetEnvironmentVariable("PATHEXT")?.Split(';')?.ToArray();
exes = extensions == null || extensions.Any(prog.EndsWith)
? new[] { prog }
: extensions.Select(ext => prog + ext).ToArray();
}
else
{
exes = new[] { exe };
exes = new[] { prog };
}
var candidates = paths.Where(path => exes.Any(exe0 => File.Exists(Path.Combine(path, exe0))));
return candidates.FirstOrDefault();
var candidates = paths?.Where(path => exes.Any(exe0 => File.Exists(Path.Combine(path, exe0))));
return candidates?.FirstOrDefault();
}
}
}