initial rev of file_subst() and its initial use (testing for now) for converting old OS X bindings from Meta to Mod2 modifiers

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@10793 d708f5d6-7413-0410-9779-e7cbd77b26cf

3 files changed, 164 insertions, 0 deletions

diff --git a/libs/pbd/SConscript b/libs/pbd/SConscript
index 1c2ee943db..c9751e80ac 100644
--- a/libs/pbd/SConscript
+++ b/libs/pbd/SConscript
@@ -28,6 +28,7 @@ enumwriter.cc
 dmalloc.cc
 epa.cc
 error.cc
+file_subst.cc
 fpu.cc
 id.cc
 localeguard.cc
diff --git a/libs/pbd/file_subst.cc b/libs/pbd/file_subst.cc
new file mode 100644
index 0000000000..e2e9c01086
--- /dev/null
+++ b/libs/pbd/file_subst.cc
@@ -0,0 +1,131 @@
+/*
+    Copyright (C) 2011 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <cstdio> /* for ::rename() */
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include "pbd/file_subst.h"
+#include "pbd/error.h"
+#include "pbd/replace_all.h"
+#include "pbd/compose.h"
+
+#include "i18n.h"
+
+using namespace PBD;
+using namespace std;
+
+/* this implementation assumes that the contents of the file are small enough to fit reasonably into 
+   memory.
+*/
+
+int
+file_subst (const string& path, const map<string,string>& dict)
+{
+        ifstream in (path.c_str());
+        int replacements = 0;
+
+        if (!in) {
+                return -1;
+        }
+
+        /* Get the size of the file */
+        in.seekg(0,std::ios::end);
+        std::streampos length = in.tellg();
+        in.seekg(0,std::ios::beg);
+
+        /* allocate a string to hold the data */
+
+        string str;
+
+        try {
+                str.reserve (length);
+        } catch (exception& e) {
+                error << string_compose (_("could not reserve space to read substitution data from %1 (err: %2"),
+                                         path, e.what()) << endmsg;
+                in.close ();
+                return -1;
+        }
+
+        /* read the file contents into the string */
+
+        while (!in.eof()) {
+                str += in.get();
+        }
+
+        if (!in) {
+                error << string_compose (_("could not read data for substitution from %1 (err: %2)"),
+                                           path, strerror (errno)) << endmsg;
+                in.close ();
+                return -1;
+        }
+
+        in.close ();
+
+        /* do the replacement */
+
+        for (map<string,string>::const_iterator i = dict.begin(); i != dict.end(); ++i) {
+                replacements += replace_all (str, i->first, i->second);
+        }
+        
+        if (replacements) {
+                char suffix[64];
+                snprintf (suffix, sizeof (suffix), ".fs_%d", getpid());
+                string s = path + suffix;
+                
+
+                ofstream out (s.c_str());
+                
+                if (out) {
+
+                        out << str;
+
+                        if (!out) {
+                                /* ignore error since we're failing anyway, although
+                                   it will leave the file around.
+                                */
+                                out.close ();
+                                (void) ::unlink (s.c_str());
+                                return -1;
+                        } else {
+#if 0
+                                if (::rename (s.c_str(), path.c_str())) {
+                                        error << string_compose (_("Could not rename substituted file %1 to %2 (err: %3)"), 
+                                                                 s, path, strerror (errno)) << endmsg;
+                                        (void) ::unlink (s.c_str());
+                                        out.close ();
+                                        return -1;
+                                }
+#endif
+                        }
+
+                        out.close ();
+
+                } else {
+                        return -1;
+                }
+
+        }
+
+        return 0;
+}
diff --git a/libs/pbd/pbd/file_subst.h b/libs/pbd/pbd/file_subst.h
new file mode 100644
index 0000000000..543a7473c8
--- /dev/null
+++ b/libs/pbd/pbd/file_subst.h
@@ -0,0 +1,32 @@
+/*
+    Copyright (C) 2011 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __pbd_file_subst_h__
+#define __pbd_file_subst_h__
+
+#include <string>
+#include <map>
+
+namespace PBD {
+
+        int file_subst (std::string& path, const std::map<std::string,std::string>&);
+
+} //namespace PBD
+
+#endif /* __pbd_file_subst_h__ */