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Add DOT_BINARY_PATH environment variable support #120

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Add DOT_BINARY_PATH environment variable support #120

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19 changes: 13 additions & 6 deletions Rubjerg.Graphviz/GraphvizCommand.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
Expand Down Expand Up @@ -40,12 +41,18 @@ internal static string Rid
internal static readonly Lazy<string> _DotExePath = new Lazy<string>(() =>
{
// Depending on the method of deployment, there are several possible directories to look for dot
string[] possibleLocations = [
Path.Combine(AppContext.BaseDirectory, "runtimes", Rid, "native"),
Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location),
Path.GetDirectoryName(AppContext.BaseDirectory),
""
];
// The DOT_BINARY_PATH environment variable can be set to point to a specific location, which will be checked first.
var dotBinaryPath = Environment.GetEnvironmentVariable("DOT_BINARY_PATH");
var possibleLocations = new List<string>();
if (!string.IsNullOrEmpty(dotBinaryPath))
{
possibleLocations.Add(dotBinaryPath);
}
possibleLocations.Add(Path.Combine(AppContext.BaseDirectory, "runtimes", Rid, "native"));
possibleLocations.Add(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
possibleLocations.Add(Path.GetDirectoryName(AppContext.BaseDirectory));
possibleLocations.Add("");

return possibleLocations.Where(d => d != null).Select(dir => Path.Combine(dir, "dot")).FirstOrDefault(File.Exists)
?? possibleLocations.Where(d => d != null).Select(dir => Path.Combine(dir, "dot.exe")).FirstOrDefault(File.Exists)
?? throw new InvalidOperationException("Could not find path to dot binary in any of: " + string.Join(", ", possibleLocations));
Expand Down
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