0.18.0 Support URL tag substitution in unquoted browser arguments

BrowseRouter/Model/Args.cs

@@ -22,6 +22,15 @@ public static (string, string) SplitPathAndArgs(string s)
       return (path, args);
     }
 
+    // If not quoted, split on first space to separate path from args
+    int spaceIndex = s.IndexOf(' ');
+    if (spaceIndex > 0)
+    {
+      string path = s[..spaceIndex];
+      string args = s[(spaceIndex + 1)..];
+      return (path, args);
+    }
+
     // The single executable without any other arguments.
     return (s, "");
   }

Directory.Build.props

@@ -5,7 +5,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
-    <Version>0.17.1</Version>
+    <Version>0.18.0</Version>
     <Product>BrowseRouter</Product>
     <Copyright>EnduraByte LLC 2022-2025</Copyright>
     <!-- Reduces flagging as malware -->

Tests/BrowseRouter.Tests/ArgsTests/GetPathAndArgsMethod.cs

@@ -55,4 +55,31 @@ public void ReturnsInputAsPath_WhenInputContainsInvalidQuotes()
     // Assert
     result.Should().Be((input, ""));
   }
+
+  [Fact]
+  public void SplitsUnquotedPathWithArgs_OnFirstSpace()
+  {
+    // Arrange - Issue #94: User wants to pass args with {url} tag to browser
+    // e.g., "firefox.exe ext+container:name=Work&url={url}"
+    string input = "firefox.exe ext+container:name=Work&url={url}";
+
+    // Act
+    var result = Args.SplitPathAndArgs(input);
+
+    // Assert - Should split on first space, treating rest as args
+    result.Should().Be(("firefox.exe", "ext+container:name=Work&url={url}"));
+  }
+
+  [Fact]
+  public void SplitsUnquotedPathWithArgs_PreservesMultipleArgs()
+  {
+    // Arrange
+    string input = "firefox.exe --new-window --url {url}";
+
+    // Act
+    var result = Args.SplitPathAndArgs(input);
+
+    // Assert
+    result.Should().Be(("firefox.exe", "--new-window --url {url}"));
+  }
 }

Tests/BrowseRouter.Tests/Services/BrowserServiceTests.cs

@@ -34,4 +34,47 @@ public async Task HandlesUrl(string url)
 
     spy.LastPath.Should().Be("fake-browser.exe");
   }
+
+  [Fact]
+  public async Task SubstitutesUrlTagInUnquotedBrowserArgs()
+  {
+    // Issue #94: User configures browser with args containing {url} tag
+    // e.g., for Firefox containers: "firefox.exe ext+container:name=Work&url={url}"
+    var config = BrowseRouter.Config.Config.Empty with
+    {
+      Browsers = new Dictionary<string, string>
+      {
+        ["ff-work"] = "firefox.exe ext+container:name=Work&url={url}",
+      },
+    };
+    CatchAllConfig.AddTo(config);
+
+    var spy = new SpyProcessService();
+    await new BrowserService(new ConfigService(config), new EmptyNotifyService(), spy)
+      .LaunchAsync("https://example.com/path", "Fake Window");
+
+    spy.LastPath.Should().Be("firefox.exe");
+    spy.LastArgs.Should().Be("ext+container:name=Work&url=https://example.com/path");
+  }
+
+  [Fact]
+  public async Task SubstitutesUrlTagInQuotedBrowserArgs()
+  {
+    // When browser path is quoted, args with {url} should still work
+    var config = BrowseRouter.Config.Config.Empty with
+    {
+      Browsers = new Dictionary<string, string>
+      {
+        ["ff-work"] = "\"firefox.exe\" ext+container:name=Work&url={url}",
+      },
+    };
+    CatchAllConfig.AddTo(config);
+
+    var spy = new SpyProcessService();
+    await new BrowserService(new ConfigService(config), new EmptyNotifyService(), spy)
+      .LaunchAsync("https://example.com/path", "Fake Window");
+
+    spy.LastPath.Should().Be("firefox.exe");
+    spy.LastArgs.Should().Be("ext+container:name=Work&url=https://example.com/path");
+  }
 }