Re-added dot/graphviz support with command line output option (#5)

Author: mikeger

README.md

@@ -128,7 +128,8 @@ This is the hardest part: dealing with obscure Xcode formats. But if we get that
 - `--base-branch`: Branch to compare against to find the relevant changes. If emitted, a local changeset is used (development mode).
 - `--test-plan`: Path to the test plan. If not given, tool would try to infer the path.
 - `--json`: Provide output in JSON format (STDOUT).
-- `--dependency-graph`: Opens Safari with a dependency graph visualization.
+- `--dependency-graph`: Opens Safari with a dependency graph visualization. Attention: if you don't trust Javascript ecosystem prefer using `--dot` option.
+- `--dot`: Output dependency graph in Dot (Graphviz) format. To be used with Graphviz: `brew install graphviz`, then `xcode-selective-test --dot | dot -Tsvg > output.svg && open output.svg`
 - `--verbose`: Provide verbose output. 
 
 ## Configuration file `.xcode-selective-testing.yml`

…iveTestingCore/DependencyGraph+DOT.swift …Core/DependencyGraph+Visualization.swiftSources/SelectiveTestingCore/DependencyGraph+DOT.swift renamed to Sources/SelectiveTestingCore/DependencyGraph+Visualization.swift Sources/SelectiveTestingCore/DependencyGraph+DOT.swift renamed to Sources/SelectiveTestingCore/DependencyGraph+Visualization.swift

@@ -6,7 +6,35 @@ import Foundation
 import Workspace
 import PathKit
 
-extension DependencyGraph {    
+extension TargetIdentity {
+    var dotDescription: String {
+        return "\"\(self.description.replacingOccurrences(of: "-", with: "_"))\""
+    }
+}
+
+extension DependencyGraph {
+    func dot() -> String {
+        var dot = """
+digraph {
+        rankdir=TB
+"""
+        let grouped = groupByPath()
+
+        grouped.keys.forEach { path in
+            let targets = grouped[path]!
+            
+            targets.forEach { target in
+                let deps = dependencies(for: target)
+                guard !deps.isEmpty else {
+                    return
+                }
+                dot = dot + "\n\t\(target.dotDescription) -> { \(deps.map(\.dotDescription).joined(separator: " ")) }"
+            }
+        }
+        dot = dot + "\n}"
+        return dot
+    }
+    
     func mermaid(highlightTargets: Set<TargetIdentity>) -> String {
         var result = "graph TD\n"
         allTargets().forEach { target in

Sources/SelectiveTestingCore/SelectiveTestingTool.swift

@@ -16,6 +16,7 @@ public final class SelectiveTestingTool {
     private let basePath: Path
     private let printJSON: Bool
     private let renderDependencyGraph: Bool
+    private let dot: Bool
     private let verbose: Bool
     private let testPlan: String?
     private let config: Config?
@@ -25,6 +26,7 @@ public final class SelectiveTestingTool {
                 testPlan: String?,
                 printJSON: Bool = false,
                 renderDependencyGraph: Bool = false,
+                dot: Bool = false,
                 verbose: Bool = false) throws {
 
         if let configData = try? (Path.current + Config.defaultConfigName).read(),
@@ -44,6 +46,7 @@ public final class SelectiveTestingTool {
         self.basePath = Path(finalBasePath)
         self.printJSON = printJSON
         self.renderDependencyGraph = renderDependencyGraph
+        self.dot = dot
         self.verbose = verbose
         self.testPlan = testPlan ?? config?.testPlan
     }
@@ -75,6 +78,13 @@ public final class SelectiveTestingTool {
             try Shell.exec("open -a Safari \"\(workspaceInfo.dependencyStructure.mermaidInURL(highlightTargets: affectedTargets))\"")
         }
 
+        if printJSON {
+            try printJSON(affectedTargets: affectedTargets)
+        }
+        else if dot {
+            print(workspaceInfo.dependencyStructure.dot())
+        }
+        
         if verbose {
             workspaceInfo.dependencyStructure
                 .allTargets()
@@ -108,10 +118,6 @@ public final class SelectiveTestingTool {
             }
         }
 
-        if printJSON {
-            try printJSON(affectedTargets: affectedTargets)
-        }
-        
         if let testPlan {
             // 4. Configure workspace to test given targets
             try enableTests(at: Path(testPlan),

Sources/xcode-selective-test/SelectiveTesting.swift

@@ -22,9 +22,12 @@ struct SelectiveTesting: AsyncParsableCommand {
     @Flag(name: .long, help: "Output in JSON format")
     var JSON: Bool = false
 
-    @Flag(help: "Render dependency graph in the browser")
+    @Flag(help: "Render dependency graph in the browser using Mermaid")
     var dependencyGraph: Bool = false
 
+    @Flag(help: "Output dependency graph in Dot (Graphviz) format")
+    var dot: Bool = false
+    
     @Flag(help: "Produce verbose output")
     var verbose: Bool = false
 
@@ -34,6 +37,7 @@ struct SelectiveTesting: AsyncParsableCommand {
                                             testPlan: testPlan,
                                             printJSON: JSON,
                                             renderDependencyGraph: dependencyGraph,
+                                            dot: dot,
                                             verbose: verbose)
 
         do {