Allow multiple contexts to be specified when adding keybindings

NEWS

@@ -8,6 +8,7 @@ DFHack Future
         Fixed a rare overflow issue that could cause crashes on Linux and OS X
         Stopped DF window from receiving input when unfocused on OS X
         Fixed issues with keybindings involving Ctrl-A and Ctrl-Z, as well as Alt-E/U/N on OS X
+        Multiple contexts can now be specified when adding keybindings
     Lua
         Scripts can be enabled with the built-in enable/disable commands
         A new function, reqscript(), is available as a safer alternative to script_environment()

Readme.rst

@@ -212,7 +212,7 @@ Possible ways to call the command:
 
 The *<key>* parameter above has the following *case-sensitive* syntax::
 
-    [Ctrl-][Alt-][Shift-]KEY[@context]
+    [Ctrl-][Alt-][Shift-]KEY[@context[|context...]]
 
 where the *KEY* part can be F1-F9 or A-Z, and [] denote optional parts.
 
@@ -227,7 +227,8 @@ the ``keybinding`` command among other things prints the current context string.
 Only bindings with a *context* tag that either matches the current context fully,
 or is a prefix ending at a '/' boundary would be considered for execution, i.e.
 for context ``foo/bar/baz``, possible matches are any of ``@foo/bar/baz``, ``@foo/bar``,
-``@foo`` or none.
+``@foo`` or none. Multiple contexts can be specified by separating them with a
+pipe (``|``) - for example, ``@foo|bar|baz/foo``.
 
 Enabling plugins
 ================

library/Core.cpp

@@ -2105,6 +2105,23 @@ bool Core::ClearKeyBindings(std::string keyspec)
 
 bool Core::AddKeyBinding(std::string keyspec, std::string cmdline)
 {
+    size_t at_pos = keyspec.find('@');
+    if (at_pos != std::string::npos)
+    {
+        std::string raw_spec = keyspec.substr(0, at_pos);
+        std::string raw_focus = keyspec.substr(at_pos + 1);
+        if (raw_focus.find('|') != std::string::npos)
+        {
+            std::vector<std::string> focus_strings;
+            split_string(&focus_strings, raw_focus, "|");
+            for (size_t i = 0; i < focus_strings.size(); i++)
+            {
+                if (!AddKeyBinding(raw_spec + "@" + focus_strings[i], cmdline))
+                    return false;
+            }
+            return true;
+        }
+    }
     int sym;
     KeyBinding binding;
     if (!parseKeySpec(keyspec, &sym, &binding.modifiers, &binding.focus))
@@ -2156,11 +2173,12 @@ std::vector<std::string> Core::ListKeyBindings(std::string keyspec)
     return rv;
 }
 
-////////////////
-// ClassNamCheck
-////////////////
 
-// Since there is no Process.cpp, put ClassNamCheck stuff in Core.cpp
+/////////////////
+// ClassNameCheck
+/////////////////
+
+// Since there is no Process.cpp, put ClassNameCheck stuff in Core.cpp
 
 static std::set<std::string> known_class_names;
 static std::map<std::string, void*> known_vptrs;