Implement the `file` function to read and write files

This allows us to do file reading and writing without $(shell). Besides
being simpler, this also allows faster regen times, since we can just
stat the files to be read, or directly write to the files that need to
be written.

1 files changed, 16 insertions, 20 deletions

diff --git a/ninja.cc b/ninja.cc
index 90fe404..59e8712 100644
--- a/ninja.cc
+++ b/ninja.cc
@@ -736,31 +736,27 @@ class NinjaGenerator {
     const vector<CommandResult*>& crs = GetShellCommandResults();
     DumpInt(fp, crs.size());
     for (CommandResult* cr : crs) {
+      DumpInt(fp, static_cast<int>(cr->op));
       DumpString(fp, cr->shell);
       DumpString(fp, cr->cmd);
       DumpString(fp, cr->result);
-      if (!cr->find.get()) {
-        // Always re-run this command.
-        DumpInt(fp, 0);
-        continue;
-      }
 
-      DumpInt(fp, 1);
-
-      vector<string> missing_dirs;
-      for (StringPiece fd : cr->find->finddirs) {
-        const string& d = ConcatDir(cr->find->chdir, fd);
-        if (!Exists(d))
-          missing_dirs.push_back(d);
-      }
-      DumpInt(fp, missing_dirs.size());
-      for (const string& d : missing_dirs) {
-        DumpString(fp, d);
-      }
+      if (cr->op == CommandOp::FIND) {
+        vector<string> missing_dirs;
+        for (StringPiece fd : cr->find->finddirs) {
+          const string& d = ConcatDir(cr->find->chdir, fd);
+          if (!Exists(d))
+            missing_dirs.push_back(d);
+        }
+        DumpInt(fp, missing_dirs.size());
+        for (const string& d : missing_dirs) {
+          DumpString(fp, d);
+        }
 
-      DumpInt(fp, cr->find->read_dirs->size());
-      for (StringPiece s : *cr->find->read_dirs) {
-        DumpString(fp, ConcatDir(cr->find->chdir, s));
+        DumpInt(fp, cr->find->read_dirs->size());
+        for (StringPiece s : *cr->find->read_dirs) {
+          DumpString(fp, ConcatDir(cr->find->chdir, s));
+        }
       }
     }