Sort "deps" and "public_deps" when running the "gn format" command.

tools/gn/command_format.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_split.h"
 #include "tools/gn/commands.h"
@@ skipping 110 matching lines @@
 
   // Remove trailing spaces from the current line.
   void Trim();
 
   // Whether there's a blank separator line at the current position.
   bool HaveBlankLine();
 
   // Flag assignments to sources, deps, etc. to make their RHSs multiline.
   void AnnotatePreferredMultilineAssignment(const BinaryOpNode* binop);
 
-  // Alphabetically a list on the RHS if the LHS is 'sources'.
-  void SortIfSources(const BinaryOpNode* binop);
+  // Alphabetically a list on the RHS if the LHS is 'sources' or 'deps'.
+  void SortIfSourcesOrDeps(const BinaryOpNode* binop);
 
   // Heuristics to decide if there should be a blank line added between two
   // items. For various "small" items, it doesn't look nice if there's too much
   // vertical whitespace added.
   bool ShouldAddBlankLineInBetween(const ParseNode* a, const ParseNode* b);
 
   // Get the 0-based x position on the current line.
   int CurrentColumn() const;
 
   // Get the current line in the output;
@@ skipping 157 matching lines @@
   if (binop->op().value() == "=" && ident && list) {
     const base::StringPiece lhs = ident->value().value();
     if (lhs == "data" || lhs == "datadeps" || lhs == "data_deps" ||
         lhs == "deps" || lhs == "inputs" || lhs == "outputs" ||
         lhs == "public" || lhs == "public_deps" || lhs == "sources") {
       const_cast<ListNode*>(list)->set_prefer_multiline(true);
     }
   }
 }
 
-void Printer::SortIfSources(const BinaryOpNode* binop) {
+void Printer::SortIfSourcesOrDeps(const BinaryOpNode* binop) {
   const IdentifierNode* ident = binop->left()->AsIdentifier();
   const ListNode* list = binop->right()->AsList();
-  // TODO(scottmg): Sort more than 'sources'?
+  // TODO(scottmg): Sort more than 'sources' and 'deps'?
   if ((binop->op().value() == "=" || binop->op().value() == "+=" ||
        binop->op().value() == "-=") &&
       ident && list) {
     const base::StringPiece lhs = ident->value().value();
-    if (lhs == "sources")
+    if (lhs == "sources" || lhs == "deps")
       const_cast<ListNode*>(list)->SortAsStringsList();
   }
 }
 
 
 bool Printer::ShouldAddBlankLineInBetween(const ParseNode* a,
                                           const ParseNode* b) {
   LocationRange a_range = a->GetRange();
   LocationRange b_range = b->GetRange();
   // If they're already separated by 1 or more lines, then we want to keep a
@@ skipping 122 matching lines @@
       Expr(accessor->member(), kPrecedenceLowest, std::string());
     } else {
       CHECK(accessor->index());
       Print("[");
       Expr(accessor->index(), kPrecedenceLowest, "]");
     }
   } else if (const BinaryOpNode* binop = root->AsBinaryOp()) {
     CHECK(precedence_.find(binop->op().value()) != precedence_.end());
     AnnotatePreferredMultilineAssignment(binop);
 
-    SortIfSources(binop);
+    SortIfSourcesOrDeps(binop);
 
     Precedence prec = precedence_[binop->op().value()];
 
     // Since binary operators format left-to-right, it is ok for the left side
     // use the same operator without parentheses, so the left uses prec. For the
     // same reason, the right side cannot reuse the same operator, or else "x +
     // (y + z)" would format as "x + y + z" which means "(x + y) + z". So, treat
     // the right expression as appearing one precedence level higher.
     // However, because the source parens are not in the parse tree, as a
     // special case for && and || we insert strictly-redundant-but-helpful-for-
@@ skipping 573 matching lines @@
       }
     } else {
       printf("%s", output_string.c_str());
     }
   }
 
   return 0;
 }
 
 }  // namespace commands