Set differences now down

[backups/.git] / main.cc

diff --git a/main.cc b/main.cc
index b809f589e5d6381e8e8af3251772f27f1ede5e79..c930155cae77a6ec538d9f90511da1efd0ee3b1d 100644 (file)
--- a/main.cc
+++ b/main.cc
@@ -1,9 +1,12 @@
 #include <iostream>
 #include <iterator>
-#include <string>
 #include <vector>
 #include <algorithm>
 
+#include <sqlite3.h>
+
+#include "filedata.hpp"
+
 using namespace std;
 
 vector<string> split( const string &line, char c, int limit = -1 ) {
@@ -25,8 +28,25 @@ vector<string> split( const string &line, char c, int limit = -1 ) {
   return out;
 }
 
+// Callback function for getting files from the database
+int populate_set( void *files_v, int, char **vals, char ** ) {
+  file_set *files = reinterpret_cast<file_set*>( files_v );
+  files->insert( new FileData( vals[0][0],
+        vals[1],
+        vals[2],
+        vals[3],
+        atoi( vals[4] ),
+        atoi( vals[5] ),
+        vals[6]) );
+  return 0;
+}
+
 int main() {
   string file_string;
+
+  file_set current_files;
+
+  // Parse the list of files on stdin
   do {
     file_string.clear();
     for( int c = cin.get(); 0 != c && ! cin.eof(); c = cin.get() ) {
@@ -36,7 +56,60 @@ int main() {
       // Example entry
       // type perms user group size datemodified name (7 total)
       // f 0600 cnb cnb 424 20051015205340 ./.git/index
-      vector<string> values = split( file_string, ' ', 7 );
+      vector<string> vals = split( file_string, ' ', 7 );
+      current_files.insert( new FileData( vals[0][0],
+            vals[1],
+            vals[2],
+            vals[3],
+            atoi( vals[4].c_str() ),
+            atoi( vals[5].c_str() ),
+            vals[6]) );
     }
   } while( ! cin.eof() );
+
+  // Get the list of previously backed up files from the database.
+  sqlite3 *db;
+
+  const char *dbname = "test.db";
+  int rc = sqlite3_open( dbname, &db );
+  if( SQLITE_OK != rc ) {
+    cerr << "Cannot open database: " << dbname << ".  Error message is..." << endl;
+    cerr << sqlite3_errmsg(db) << endl;
+  }
+
+  char *sqliteErrMsg = 0;
+  file_set previous_files;
+  rc = sqlite3_exec( db, "select * from filedata;", populate_set, &previous_files, &sqliteErrMsg );
+  if( SQLITE_OK != rc ) {
+    cerr << "Problem with database.  Message is..." << endl;
+    cerr << sqliteErrMsg << endl;
+  }
+
+  sqlite3_close( db );
+
+  for( file_set::iterator i = previous_files.begin(); i != previous_files.end(); ++i ) {
+    cout << (*i)->getFileName() << endl;
+  }
+
+  // Now divide the two sets into three sets (union and set differences)
+  FileDataPtrCmp cmp;
+
+  file_set new_set;
+  set_difference( current_files.begin(),  current_files.end(),
+                  previous_files.begin(), previous_files.end(),
+                  inserter( new_set, new_set.begin() ),
+                  cmp );
+
+  file_set deleted_set;
+  set_difference( previous_files.begin(), previous_files.end(),
+                  current_files.begin(),  current_files.end(),
+                  inserter( deleted_set, deleted_set.begin() ),
+                  cmp );
+
+  // previous_files *should* definitely be the first set here
+  file_set common_set;
+  set_difference( previous_files.begin(), previous_files.end(),
+                  current_files.begin(),  current_files.end(),
+                  inserter( common_set, common_set.begin() ),
+                  cmp );
 }