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, 15 insertions, 1 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 7ad4d80..6966d22 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -121,7 +121,7 @@ get_default_config_path(const gchar *program)
 static inline gchar *
 get_default_config_path(const gchar *program)
 {
-	return g_strdup(g_getenv("HOME") ? : g_get_home_dir());
+	return g_strdup(g_getenv("HOME"));
 }
 
 #else
@@ -199,6 +199,18 @@ initialize_environment(const gchar *program)
 	gchar **env;
 
 	/*
+	 * Initialize and canonicalize $HOME.
+	 * Therefore we can refer to $HOME as the
+	 * current user's home directory on any platform
+	 * and it can be re-configured even though g_get_home_dir()
+	 * evaluates $HOME only beginning with glib v2.36.
+	 */
+	g_setenv("HOME", g_get_home_dir(), FALSE);
+	abs_path = get_absolute_path(g_getenv("HOME"));
+	g_setenv("HOME", abs_path, TRUE);
+	g_free(abs_path);
+
+	/*
 	 * Initialize $SCITECOCONFIG and $SCITECOPATH
 	 */
 	default_configpath = get_default_config_path(program);
@@ -340,6 +352,8 @@ main(int argc, char **argv)
 	QRegisters::globals.insert("-");
 	/* current buffer name and number ("*") */
 	QRegisters::globals.insert(new QRegisterBufferInfo());
+	/* current working directory ("$") */
+	QRegisters::globals.insert(new QRegisterWorkingDir());
 	/* environment defaults and registers */
 	initialize_environment(argv[0]);