Collect tooling/config/runtime issues, instead of throwing on the first one that breaks.

lib/pana.dart

@@ -34,6 +34,7 @@ class PackageAnalyzer {
 
   Future<Summary> inspectPackage(String package,
       {String version, bool keepTransitiveLibs: false}) async {
+    List<AnalyzerIssue> issues = [];
     var sdkVersion = _dartSdk.version;
     log.info("SDK: $sdkVersion");
 
@@ -65,8 +66,8 @@ class PackageAnalyzer {
     log.info("Checking pubspec.yaml...");
     var pubspec = new Pubspec.parseFromDir(pkgDir);
     if (pubspec.hasUnknownSdks) {
-      throw new Exception(
-          'Unknown SDKs in pubspec.yaml: ${pubspec.dependentSdks}');
+      issues.add(new AnalyzerIssue(AnalyzerScopes.pubspec,
+          'Unknown SDKs: ${pubspec.unknownSdks}', 'unknown-sdks'));
     }
 
     log.info("Pub upgrade...");
@@ -85,18 +86,24 @@ class PackageAnalyzer {
       libraryScanner = new LibraryScanner(package, pkgDir, isFlutter);
     } on StateError catch (e, stack) {
       log.severe("Could not create LibraryScanner", e, stack);
+      issues.add(new AnalyzerIssue(
+          AnalyzerScopes.libraryScanner, e.toString(), 'init'));
     }
 
     if (libraryScanner != null) {
       try {
         allDirectLibs = await libraryScanner.scanDirectLibs();
       } catch (e, st) {
         log.severe('Error scanning direct librariers', e, st);
+        issues.add(new AnalyzerIssue(
+            AnalyzerScopes.libraryScanner, e.toString(), 'direct'));
       }
       try {
         allTransitiveLibs = await libraryScanner.scanTransitiveLibs();
       } catch (e, st) {
         log.severe('Error scanning transitive librariers', e, st);
+        issues.add(new AnalyzerIssue(
+            AnalyzerScopes.libraryScanner, e.toString(), 'transient'));
       }
       libraryScanner.clearCaches();
     }
@@ -108,7 +115,8 @@ class PackageAnalyzer {
       if (e.toString().contains("No dart files found at: .")) {
         log.warning("No files to analyze...");
       } else {
-        rethrow;
+        issues
+            .add(new AnalyzerIssue(AnalyzerScopes.dartAnalyzer, e.toString()));
       }
     }
 
@@ -148,25 +156,34 @@ class PackageAnalyzer {
       }
     }
 
-    return new Summary(
-        sdkVersion, package, new Version.parse(pkgInfo.version), summary, files,
+    return new Summary(sdkVersion, package, new Version.parse(pkgInfo.version),
+        summary, files, issues,
         flutterVersion: flutterVersion);
   }
 
   Future<Set<AnalyzerOutput>> _pkgAnalyze(String pkgPath) async {
     log.info('Running `dartanalyzer`...');
     var proc = await _dartSdk.runAnalyzer(pkgPath);
 
+    String output = proc.stderr;
+    if ('\n$output'.contains('\nUnhandled exception:\n')) {
+      log.severe("Bad input?");
+      log.severe(output);
+      String errorMessage =
+          '\n$output'.split('\nUnhandled exception:\n')[1].split('\n').first;
+      throw new ArgumentError('dartanalyzer exception: $errorMessage');
+    }
+
     try {
       return new SplayTreeSet.from(LineSplitter
-          .split(proc.stderr)
+          .split(output)
           .map((s) => AnalyzerOutput.parse(s, projectDir: pkgPath))
           .where((e) => e != null));
     } on ArgumentError {
       // TODO: we should figure out a way to succeed here, right?
       // Or at least do partial results and not blow up
       log.severe("Bad input?");
-      log.severe(proc.stderr);
+      log.severe(output);
       rethrow;
     }
   }

lib/src/pubspec.dart

@@ -56,9 +56,11 @@ class Pubspec {
     return _dependentSdks;
   }
 
-  bool get hasUnknownSdks {
-    Set<String> sdks = new Set.from(dependentSdks);
-    sdks.remove('flutter');
-    return sdks.isNotEmpty;
+  Set<String> get unknownSdks {
+    Set<String> unknowns = new Set.from(dependentSdks);
+    unknowns.remove('flutter');
+    return unknowns;
   }
+
+  bool get hasUnknownSdks => unknownSdks.isNotEmpty;
 }

lib/src/summary.dart

@@ -75,9 +75,10 @@ class Summary {
   final Version packageVersion;
   final PubSummary pubSummary;
   final Map<String, DartFileSummary> dartFiles;
+  final List<AnalyzerIssue> issues;
 
   Summary(this.sdkVersion, this.packageName, this.packageVersion,
-      this.pubSummary, this.dartFiles,
+      this.pubSummary, this.dartFiles, this.issues,
       {this.flutterVersion});
 
   factory Summary.fromJson(Map<String, dynamic> json) {
@@ -90,9 +91,12 @@ class Summary {
     Map<String, DartFileSummary> dartFiles = new SplayTreeMap.fromIterable(
         filesMap.keys,
         value: (key) => new DartFileSummary.fromJson(filesMap[key]));
+    List issuesRaw = json['issues'];
+    List<AnalyzerIssue> issues =
+        issuesRaw?.map((Map map) => new AnalyzerIssue.fromJson(map))?.toList();
 
     return new Summary(
-        sdkVersion, packageName, packageVersion, pubSummary, dartFiles,
+        sdkVersion, packageName, packageVersion, pubSummary, dartFiles, issues,
         flutterVersion: json['flutterVersion']);
   }
 
@@ -116,6 +120,37 @@ class Summary {
       'dartFiles': dartFiles,
     });
 
+    if (issues != null && issues.isNotEmpty) {
+      map['issues'] = issues;
+    }
+
     return map;
   }
 }
+
+class AnalyzerIssue {
+  final String scope;
+  final String message;
+  final dynamic code;
+
+  AnalyzerIssue(this.scope, this.message, [this.code]);
+
+  factory AnalyzerIssue.fromJson(Map<String, dynamic> json) =>
+      new AnalyzerIssue(
+        json['scope'],
+        json['message'],
+        json['code'],
+      );
+
+  Map<String, dynamic> toJson() {
+    var map = <String, dynamic>{'scope': scope, 'message': message};
+    if (code != null) map['code'] = code;
+    return map;
+  }
+}
+
+abstract class AnalyzerScopes {
+  static const String pubspec = 'pubspec';
+  static const String dartAnalyzer = 'dart-analyzer';
+  static const String libraryScanner = 'library-scanner';
+}

test/end2end/http_data.dart

@@ -30,7 +30,7 @@ final data = {
       "charcode": "1.1.1",
       "collection": "1.14.1",
       "http_parser": "3.1.1",
-      "path": "1.4.1",
+      "path": startsWith("1.4."),
       "source_span": "1.4.0",
       "stack_trace": "1.7.3",
       "string_scanner": "1.0.2",
@@ -42,7 +42,7 @@ final data = {
       "charcode": "1.1.1",
       "collection": "1.14.1",
       "http_parser": "3.1.1",
-      "path": "1.4.1",
+      "path": startsWith("1.4."),
       "source_span": "1.4.0",
       "stack_trace": "1.7.3",
       "string_scanner": "1.0.2",

test/end2end/pub_server_data.dart

@@ -36,7 +36,7 @@ final data = {
       "mime": "0.9.3",
       "package_config": "1.0.1",
       "package_resolver": "1.0.2",
-      "path": "1.4.1",
+      "path": startsWith("1.4."),
       "plugin": "0.2.0",
       "pool": "1.3.1",
       "pub_semver": "1.3.2",
@@ -86,7 +86,7 @@ final data = {
       "mime": "0.9.3",
       "package_config": "1.0.1",
       "package_resolver": "1.0.2",
-      "path": "1.4.1",
+      "path": startsWith("1.4."),
       "plugin": "0.2.0",
       "pool": "1.3.1",
       "pub_semver": "1.3.2",