Separating the 'task shell' command in a separate executable 'tasksh' and enabling command history traversal using GNU Readline

src/shell/main.cpp

@@ -1,5 +1,150 @@
-int main()
+////////////////////////////////////////////////////////////////////////////////
+// taskwarrior - a command line task list manager.
+//
+// Copyright 2006-2012, Paul Beckingham, Federico Hernandez.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// http://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#define L10N                                           // Localization complete.
+
+#include <iostream>
+#include <cstring>
+#include <stdlib.h>
+
+#ifdef CYGWIN
+#include <time.h>
+#else
+#include <sys/time.h>
+#endif
+
+#include <text.h>
+#include <i18n.h>
+#include <Color.h>
+#include <Context.h>
+#include <cmake.h>
+#include <Readline.h>
+
+Context context;
+
+#ifdef HAVE_SRANDOM
+#define srand(x) srandom(x)
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+int main (int argc, const char** argv)
 {
-  return 0;
+  // Set up randomness.
+#ifdef CYGWIN
+  srand (time (NULL));
+#else
+  struct timeval tv;
+  gettimeofday (&tv, NULL);
+  srand (tv.tv_usec);
+#endif
+
+  int status = 0;
+
+  if (argc == 2 && !strcmp (argv[1], "--version"))
+  {
+    std::cout << VERSION << "\n";
+  }
+  else
+  {
+    if (argc > 1)
+    {
+      std::cerr << STRING_SHELL_UNKOWN_OPTION << argv[1] << "\n";
+    }
+
+    // Begining initilaization
+    status = context.initialize (0, NULL);
+
+    // Display some kind of welcome message.
+    Color bold (Color::nocolor, Color::nocolor, false, true, false);
+    std::cout << (context.color () ? bold.colorize (PACKAGE_STRING) : PACKAGE_STRING)
+              << " shell\n\n"
+              << STRING_CMD_SHELL_HELP1 << "\n"
+              << STRING_CMD_SHELL_HELP2 << "\n"
+              << STRING_CMD_SHELL_HELP3 << "\n\n";
+
+    // Make a copy because context.clear will delete them.
+    std::string permanent_overrides;
+    std::vector <Arg>::iterator i;
+    for (i = context.a3.begin (); i != context.a3.end (); ++i)
+    {
+      if (i->_category == Arg::cat_rc ||
+          i->_category == Arg::cat_override)
+      {
+        if (i != context.a3.begin ())
+          permanent_overrides += " ";
+
+        permanent_overrides += i->_raw;
+      }
+    }
+
+    std::string input, prompt(context.config.get ("shell.prompt") + " ");
+
+    std::vector <std::string> quit_commands;
+    quit_commands.push_back ("quit");
+    quit_commands.push_back ("exit");
+    quit_commands.push_back ("bye");
+
+    // The event loop.
+    while (1)
+    {
+      context.clear ();
+
+      input = Readline::gets (prompt);
+      if (std::find (quit_commands.begin (), quit_commands.end (),
+                     lowerCase (input)) != quit_commands.end ())
+        break;
+
+      try
+      {
+        Wordexp w ("task " + trim (input + permanent_overrides));
+        status = context.initialize (w.argc (), (const char**)w.argv ());
+        if (status == 0)
+          status = context.run ();
+      }
+
+      catch (const std::string& error)
+      {
+        std::cerr << error << "\n";
+        status = -1;
+        break;
+      }
+
+      catch (...)
+      {
+        std::cerr << STRING_UNKNOWN_ERROR << "\n";
+        status = -2;
+        break;
+      }
+    }
+  }
+
+  // No need to repeat any overrides after the shell quits.
+  context.clearMessages ();
+  return status;
 }
 
+////////////////////////////////////////////////////////////////////////////////