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* <$$> is faster than jumping to the end of the macro
and enables shorter code for returning values from macros.
* this also replaces $$ as an immediate editing command.
In other words, command line termination is an ordinary command
now. The old behaviour was similar to what classic TECO did.
Classic TECO however had no choice than to track key presses
directly for command line termination as it did not keep track
about the parser state as input was typed.
This led to some glitches in the language. For instance
"FS$$" would terminate the command line, unless the second escape
was typed after backspace, etc. This behaviour is not worth copying
and SciTECO did a better job than that by making sure that at least the
second escape is only effective if it is not part of language syntax.
This still lead to some undesirable cases like "ES...$$$" that would
terminate the command line unexpectedly.
To terminate the command line after something like "FS$$", you will
now have to type "FS$$$$".
* As it is a regular command now - just executed immediately - and
its properties stay close to the macro return behaviour, command line
termination may now not always be performed when $$ is typed even
as a standalone command. E.g. "Ofoo$ !bar!$$ !foo!Obar$" will
curiously terminate the command line now.
* This also means that macros can finally terminate command lines
by using the command line editing commands ({ and }) to insert
$$ into the command line macro.
This is also of interest for function key macros.
* This implementation showed some serious shortcoming in SciTECO's
current parser that yet have to be fixed.
E.g. the macro "@^Ua{<$$>}" is currently unsafe since
loops abuse the expression stack for storing their state and $$
does not touch the expression stack. Calling "Ma>" would actually
continue the loop jumping to the beginning of the command line
since program counters referring to the macro A will be reused!
This cannot be easily solved by checking for loop termination
since being able to return that way from loops is a useful
feature. This is a problem even without loops and $$, e.g. as
in "@^Ua{1,2,3(4,5} Ma)".
Instead, a kind of expression stack frame pointer must be
added to macro invocation stack frames, pointing to the beginning
of the expression stack for the current frame.
At the end of macros or on return, the stack contents of
corresponding to the frame can be discarded while preserving the
immediate arguments at the time of the return or end-of-macro.
This would stabilize SciTECO's macro semantics.
* When a top-level macro returns in batch mode, it would
be a good idea to use the last argument to calculate the
process return code, so it can be set by SciTECO scripts (TODO).
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appending to "$"
* these operations are unsupported and there is no benefit
in ignoring them silently. It only confused the user.
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cleanup/refactoring
* characters rubbed out are not totally removed from the command line,
but only from the *effective* command line.
* The rubbed out command line is displayed after the command line cursor.
On Curses it is grey and underlined.
* When characters are inserted that are on the rubbed out part of the command line,
the cursor simply moves forward.
NOTE: There's currently no immediate editing command for reinserting the
next character/word from the rubbed out command line.
* Characters resulting in errors are no longer simply discarded but rubbed out,
so they will stay in the rubbed out part of the command line, reminding you
which character caused the error.
* Improved Cmdline formatting on Curses UI:
* Asterisk is printed bold
* Control characters are printed in REVERSE style, similar to what
Scinterm does. The controll character formatting has thus been moved
from macro_echo() in cmdline.cpp to the UI implementations.
* Updated the GTK+ UI (UNTESTED): I did only, the most important API
adaptions. The command line still does not use any colors.
* Refactored entire command line handling:
* The command line is now a class (Cmdline), and most functions
in cmdline.cpp have been converted to methods.
* Esp. process_edit_cmd() (now Cmdline::process_edit_cmd()) has been
simplified. There is no longer the possibility of a buffer overflow
because of static insertion buffer sizes
* Cleaned up usage of the cmdline_pos variable (now Cmdline::pc) which
is really a program counter that used a different origin as macro_pc
which was really confusing.
* The new Cmdline class is theoretically 8-bit clean. However all of this
will change again when we introduce Scintilla views for the command line.
* Added 8-bit clean (null-byte aware) versions of QRegisterData::set_string()
and QRegisterData::append_string()
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string-utils.cpp and string-utils.h
* also improved performance of String::append() by using g_realloc()
* added String::append() variant for non-null-terminated strings
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* when throwing GlibError(), this is taken care of automatically.
* fixes a memleak since there may be resources associated with the
GError.
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the QUIT hook is actually not that trivial and required
some architectural changes.
First, the QUIT hook execution and any error that might
occurr cannot always be attached to an existing error stack
frame. Thereforce, to give a stack frame for QUIT hooks and
to improve the readability of error traces for ED hooks in general,
a special EDHookFrame is added to every ED hook execution error.
Secondly, since QUIT hooks can themselves throw errors, we cannot
run it from an atexit() handler. Instead it's always called manually
before __successful__ program termination. An error in a QUIT hook
will result in a failure return code nevertheless.
Thirdly, errors in QUIT hooks should not prevent program termination
(in interactive mode), therefore they are only invoked from main()
and always in batch mode. I.e. if the interactive mode is terminated
(EX$$), SciTECO will switch back to batch mode and run the QUIT
hook there. This is also symmetric to program startup, which is
always in batch mode.
This means that Interface::event_loop() no longer runs indefinitely.
If it returns, this signals that the interface shut down and
batch mode may be restored by SciTECO.
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introduced Error::set_coord()
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* the GError expection has been renamed to GlibError, to avoid
nameclashes when working from the SciTECO namespace
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