added <FG> command and special Q-Register "$" to set and get the current working directory

 * FG stands for "Folder Go"
 * FG behaves similar to a Unix shell `cd`.
   Without arguments, it changes to the $HOME directory.
 * The $HOME directory was previously only used by $SCITECOCONFIG on Unix.
   Now it is documented on its own, since the HOME directory should also
   be configurable on Windows - e.g. to adapt SciTECO to a MinGW or Cygwin
   installation.
   HOME is initialized just like the other environment variables.
   This also means that now, the $HOME Q-Register is always defined
   and can be used by platform-agnostic macros.
 * FG uses a new kind of tab-completion: for directories only.
   It would be annoying to complete the FG command after every
   directory, so this tab-completion does not close the command
   automatically. Theoretically, it would be possible to close
   the command after completing a directory with no subdirectories,
   but this is not supported currently.
 * Filename arguments are no longer completed with " " if {} escaping
   is in place as this brings no benefit. Instead no completion character
   is inserted for this escape mode.
 * "$" was mapped to the current directory to support an elegant way to
   insert/get the current directory.
   Also this allows the idiom "[$ FG...new_dir...$ ]$" for changing
   the current directory temporarily.
 * The Q-Register stack was extended to support restoring the string
   part of special Q-Registers (that overwrite the default functionality)
   when using the "[$" and "]$" commands.
 * fixed minor typos (american spelling)

1 files changed, 46 insertions, 0 deletions

diff --git a/src/parser.h b/src/parser.h
index a6a18bb..605c1a5 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -18,6 +18,8 @@
 #ifndef __PARSER_H
 #define __PARSER_H
 
+#include <string.h>
+
 #include <glib.h>
 
 #include "sciteco.h"
@@ -160,6 +162,12 @@ public:
 		       : StateExpectString(_building, _last) {}
 };
 
+class StateExpectDir : public StateExpectFile {
+public:
+	StateExpectDir(bool _building = true, bool _last = true)
+		      : StateExpectFile(_building, _last) {}
+};
+
 class StateStart : public State {
 public:
 	StateStart();
@@ -200,6 +208,37 @@ private:
 	State *custom(gchar chr);
 };
 
+class UndoTokenChangeDir : public UndoToken {
+	gchar *dir;
+
+public:
+	/**
+	 * Construct undo token.
+	 *
+	 * This passes ownership of the directory string
+	 * to the undo token object.
+	 */
+	UndoTokenChangeDir(gchar *_dir) : dir(_dir) {}
+	~UndoTokenChangeDir()
+	{
+		g_free(dir);
+	}
+
+	void run(void);
+
+	gsize
+	get_size(void) const
+	{
+		return dir ? sizeof(*this) + strlen(dir)
+		           : sizeof(*this);
+	}
+};
+
+class StateChangeDir : public StateExpectDir {
+private:
+	State *done(const gchar *str);
+};
+
 class StateCondCommand : public State {
 public:
 	StateCondCommand();
@@ -253,6 +292,7 @@ namespace States {
 	extern StateControl		control;
 	extern StateASCII		ascii;
 	extern StateFCommand		fcommand;
+	extern StateChangeDir		changedir;
 	extern StateCondCommand		condcommand;
 	extern StateECommand		ecommand;
 	extern StateScintilla_symbols	scintilla_symbols;
@@ -280,6 +320,12 @@ namespace States {
 	{
 		return dynamic_cast<StateExpectFile *>(current);
 	}
+
+	static inline bool
+	is_dir()
+	{
+		return dynamic_cast<StateExpectDir *>(current);
+	}
 }
 
 extern enum Mode {