Fixed file heading comments not matching the filename (issue #83). Patch by Ryan Pavlik.

Also made the length of the first line to be 80 characters where possible.

iwyu.cc

@@ -1,4 +1,4 @@
-//===--- iwyu.cpp - main logic and driver for include-what-you-use --------===//
+//===--- iwyu.cc - main logic and driver for include-what-you-use ---------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_ast_util.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_ast_util.h - clang-AST utilities for include-what-you-use ---===//
+//===--- iwyu_ast_util.cc - clang-AST utilities for include-what-you-use --===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_cache.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_cache.cpp - cache of AST-derived information, for iwyu ------===//
+//===--- iwyu_cache.cc - cache of AST-derived information, for iwyu -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_globals.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_string_util.cpp - global variables for include-what-you-use -===//
+//===--- iwyu_globals.cc - global variables for include-what-you-use ------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_globals.h

@@ -1,4 +1,4 @@
-//===--- iwyu_string_util.h - global variables for include-what-you-use ---===//
+//===--- iwyu_globals.h - global variables for include-what-you-use -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_include_picker.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_include_picker.cpp - map to canonical #includes for iwyu ----===//
+//===--- iwyu_include_picker.cc - map to canonical #includes for iwyu -----===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_lexer_utils.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_lexer_utils.cpp - clang-lexer utilities for iwyu ------------===//
+//===--- iwyu_lexer_utils.cc - clang-lexer utilities for iwyu -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_location_util.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_location_util.cpp - SourceLoc-related utilities for iwyu ----===//
+//===--- iwyu_location_util.cc - SourceLoc-related utilities for iwyu -----===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_output.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_output.cpp - output-emitting code for include-what-you-use --===//
+//===--- iwyu_output.cc - output-emitting code for include-what-you-use ---===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_path_util.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_path_util.cc - path utilities for iwyu ----===//
+//===--- iwyu_path_util.cc - file-path utilities for include-what-you-use -===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_preprocessor.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_preprocessor.cpp - handle #includes/#defines for iwyu -------===//
+//===--- iwyu_preprocessor.cc - handle #includes/#defines for iwyu --------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_verrs.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_verrs.h - debug output for include-what-you-use ----===//
+//===--- iwyu_verrs.cc - debug output for include-what-you-use ------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

iwyu_verrs.h

@@ -1,4 +1,4 @@
-//===--- iwyu_verrs.h - debug output for include-what-you-use ----===//
+//===--- iwyu_verrs.h - debug output for include-what-you-use -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

more_tests/iwyu_lexer_utils_test.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_lexer_utils_test.cpp - test iwyu_lexer_utils.{cc,h} ---------===//
+//===--- iwyu_lexer_utils_test.cc - test iwyu_lexer_utils.{cc,h} ----------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

more_tests/iwyu_output_test.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_output_test.cpp - test iwyu_output.{h,cc} -------------------===//
+//===--- iwyu_output_test.cc - test iwyu_output.{h,cc} --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

more_tests/iwyu_string_util_test.cc

@@ -1,4 +1,4 @@
-//===--- iwyu_string_util_test.cpp - test iwyu_string_util.h -------------===//
+//===--- iwyu_string_util_test.cc - test iwyu_string_util.h ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-d10.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-d10.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-d10.h - test input file for iwyu -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-d14.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-d14.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-d14.h - test input file for iwyu -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-d15.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-d15.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-d15.h - test input file for iwyu -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-d2.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-d1.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-d2.h - test input file for iwyu ------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-i10.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-i10.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-i10.h - test input file for iwyu -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/comment_pragmas-i11.h

@@ -1,4 +1,4 @@
-//===--- comment_pragmas-i11.h - test input file for iwyu ------------------===//
+//===--- comment_pragmas-i11.h - test input file for iwyu -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/implicit_ctor-d1.h

@@ -1,4 +1,4 @@
-//===--- implicit_ctor-d1.h - test input file for iwyu ---------------------===//
+//===--- implicit_ctor-d1.h - test input file for iwyu --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/implicit_ctor-i1.h

@@ -1,4 +1,4 @@
-//===--- implicit_ctor-i1.h - test input file for iwyu ---------------------===//
+//===--- implicit_ctor-i1.h - test input file for iwyu --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/implicit_ctor-i2.h

@@ -1,4 +1,4 @@
-//===--- implicit_ctor-i2.h - test input file for iwyu ---------------------===//
+//===--- implicit_ctor-i2.h - test input file for iwyu --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/include_with_using-d2.h

@@ -1,4 +1,4 @@
-//===--- include_with_using-d1.h - test input file for iwyu ---------------===//
+//===--- include_with_using-d2.h - test input file for iwyu ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/internal/private.h

@@ -1,4 +1,4 @@
-//===--- internal_files.cc - test input file for iwyu ---------------------===//
+//===--- private.h - test input file for iwyu -----------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/system_namespaces-d2.h

@@ -1,4 +1,4 @@
-//===--- system_namespaces-d1.h - test input file for iwyu ----------------===//
+//===--- system_namespaces-d2.h - test input file for iwyu ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //

tests/system_namespaces-d3.h

@@ -1,4 +1,4 @@
-//===--- system_namespaces-d1.h - test input file for iwyu ----------------===//
+//===--- system_namespaces-d3.h - test input file for iwyu ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //