From 6bb9a8d1308b1e42d9e42ace816eb66df61b6e45 Mon Sep 17 00:00:00 2001
From: Evan Martin <martine@danga.com>
Date: Mon, 25 Oct 2010 21:30:20 -0700
Subject: [PATCH] basic untested depfile loader

---
 ninja.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 49 insertions(+), 2 deletions(-)

diff --git a/ninja.h b/ninja.h
index 7e71042..5855a77 100644
--- a/ninja.h
+++ b/ninja.h
@@ -131,12 +131,14 @@ struct Rule {
   EvalString depfile_;
 };
 
+class State;
 struct Edge {
   Edge() : rule_(NULL), env_(NULL) {}
 
   void MarkDirty(Node* node);
   void RecomputeDirty(DiskInterface* disk_interface);
   string EvaluateCommand();  // XXX move to env, take env ptr
+  bool LoadDepFile(State* state, string* err);
 
   Rule* rule_;
   enum InOut { IN, OUT };
@@ -279,6 +281,53 @@ struct State : public EvalString::Env {
   void AddBinding(const string& key, const string& val);
 };
 
+#include "manifest_parser.h"
+
+bool Edge::LoadDepFile(State* state, string* err) {
+  if (rule_->depfile_.empty())
+    return false;
+
+  EdgeEnv env(this);
+  string path = rule_->depfile_.Evaluate(&env);
+
+  string content = ReadFile(path, err);
+  if (!err->empty())
+    return false;
+
+  MakefileParser makefile;
+  if (!makefile.Parse(content, err))
+    return false;
+
+  // Check that this depfile matches our output.
+  if (outputs_.size() != 1) {
+    *err = "expected only one output";
+    return false;
+  }
+  if (outputs_[0]->file_->path_ != makefile.out_) {
+    *err = "expected makefile to mention '" + outputs_[0]->file_->path_ + "', "
+           "got '" + makefile.out_ + "'";
+    return false;
+  }
+
+  // Add all its in-edges.
+  for (vector<string>::iterator i = makefile.ins_.begin();
+       i != makefile.ins_.end(); ++i) {
+    Node* node = state->GetNode(*i);
+    for (vector<Node*>::iterator j = inputs_.begin(); j != inputs_.end(); ++j) {
+      if (*j == node) {
+        node = NULL;
+        break;
+      }
+    }
+    if (node) {
+      inputs_.push_back(node);
+      node->out_edges_.push_back(this);
+    }
+  }
+
+  return true;
+}
+
 string State::Evaluate(const string& var) {
   if (var.size() > 1 && var[0] == '$') {
     map<string, string>::iterator i = env_.find(var.substr(1));
@@ -442,8 +491,6 @@ void Plan::NodeFinished(Node* node) {
 }
 
 
-#include "manifest_parser.h"
-
 struct Shell {
   virtual ~Shell() {}
   virtual bool RunCommand(Edge* edge);
-- 
2.7.4