GUI: add "Open With" entry in reslist/table popups to let the user choose the app

src/utils/appformime.h

@@ -24,6 +24,7 @@
  * code which would parse /usr/share/applications to return a list of
  * apps for a given mime type. So here goes. Note that the implementation
  * is very primitive for now (no use of cache file, no updating once built).
+ * Also, this is not thread-safe, but could be made so quite easily.
  */
 class DesktopDb {
 public:
@@ -49,7 +50,7 @@ public:
      *   problem was detected.
      */
     bool appForMime(const std::string& mime, vector<AppDef> *apps, 
-                    std::string *reason);
+                    std::string *reason = 0);
 
 private:
     DesktopDb();

src/utils/smallut.cpp

@@ -534,7 +534,7 @@ string escapeShell(const string &in)
 
 
 // Substitute printf-like percent cmds inside a string
-bool pcSubst(const string& in, string& out, map<char, string>& subs)
+bool pcSubst(const string& in, string& out, const map<char, string>& subs)
 {
     string::const_iterator it;
     for (it = in.begin(); it != in.end();it++) {
@@ -547,7 +547,7 @@ bool pcSubst(const string& in, string& out, map<char, string>& subs)
 		out += '%';
 		continue;
 	    }
-	    map<char,string>::iterator tr;
+	    map<char,string>::const_iterator tr;
 	    if ((tr = subs.find(*it)) != subs.end()) {
 		out += tr->second;
 	    } else {
@@ -561,7 +561,7 @@ bool pcSubst(const string& in, string& out, map<char, string>& subs)
     return true;
 }
 
-bool pcSubst(const string& in, string& out, map<string, string>& subs)
+bool pcSubst(const string& in, string& out, const map<string, string>& subs)
 {
     out.erase();
     string::size_type i;
@@ -592,7 +592,7 @@ bool pcSubst(const string& in, string& out, map<string, string>& subs)
             } else {
                 key = in[i];
             }
-	    map<string,string>::iterator tr;
+	    map<string,string>::const_iterator tr;
 	    if ((tr = subs.find(key)) != subs.end()) {
 		out += tr->second;
 	    } else {

src/utils/smallut.h

@@ -143,9 +143,9 @@ string displayableBytes(off_t size);
 string breakIntoLines(const string& in, unsigned int ll = 100, 
 		      unsigned int maxlines= 50);
 /** Small utility to substitute printf-like percents cmds in a string */
-bool pcSubst(const string& in, string& out, map<char, string>& subs);
+bool pcSubst(const string& in, string& out, const map<char, string>& subs);
 /** Substitute printf-like percents and also %(key) */
-bool pcSubst(const string& in, string& out, map<string, string>& subs);
+bool pcSubst(const string& in, string& out, const map<string, string>& subs);
 
 /** Append system error message */
 void catstrerror(string *reason, const char *what, int _errno);