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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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* acts as a safe-guard against uninterrupted infinite loops
or other operations that are costly to undo in interactive mode.
If we're out of memory, it is usually too late to react properly.
This implementation tries to avoid OOMs due to SciTECO behaviour.
We cannot fully exclude the chance of an OOM error.
* The undo stack size is only approximated using the
UndoToken::get_size() method.
Other ways to measure the exact amount of allocated heap
(including size fields in every heap object or using sbrk(0) and
similar) are either costly in terms of memory or platform-specific.
This implementation does not need any additional memory per heap
object or undo token but exploits the fact that undo tokens
are virtual already. The size of an undo token is determined
at compile time.
* Default memory limit of 500mb should be OK for most people.
* The current limit can be queried with "2EJ" and set with <x>,2EJ.
This also works interactively (a bit tricky!)
* Limiting can be disabled. In this case, undo token processing
is a bit faster.
* closes #3
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The user interface provides a Scintilla view abstraction and
every buffer is based on a view. All Q-Register strings use
a single dedicated view to save memory and initialization time
when using many string registers.
* this means we can finally implement a working lexer configuration
and it only has to be done once when the buffer is first added
to the ring. It is unnecessary to magically restore the lexer
styles upon rubout of EB (very hard to implement anyway). It
is also not necessary to rerun the lexer configuration macro
upon rubout which would be hard to reconcile with SciTECO's
basic design since every side-effect should be attached to a
character.
* this means that opening buffers is slightly slower now
because of the view initialization
* on the other hand, macros with many string q-reg operations
are faster now, since the document must no longer be changed
on the buffer's view and restored later on.
* also now we can make a difference between editing a document
in a view and changing the current view, which reduces UI calls
* the Document class has been retained as an abstraction about
Scintilla documents, used by QRegister Strings.
It had to be made virtual, so the view on which the document
is created can be specified by a virtual function.
There is no additional space overhead for Documents.
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normally, since SciTECO is not a library, this is not strictly
necessary since every library should use proper name prefixes
or namespaces for all global declarations to avoid name clashes.
However
* you cannot always rely on that
* Scintilla does violate the practice of using prefixes or namespaces.
The public APIs are OK, but it does define global functions/methods,
e.g. for "Document" that clashed with SciTECO's "TECODocument" class at
link-time.
Scintilla can put its definitions in a namespace, but this feature
cannot be easily enabled without patching Scintilla.
* a "SciTECO" namespace will be necessary if "SciTECO" is ever to be
turned into a library. Even if this library will have only a C-linkage
API, it must ensure it doesn't clutter the global namespace.
So the old "TECODocument" class was renamed back to "Document"
(SciTECO::Document).
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* simplified traditional commandline editing. no need to extend cmdline string one character
at a time when inserting multiple. instead there's a marker (cmdline_pos) specifying the macro
length to execute in a "step" and also the anchor for generating undo tokens
* implementation does not yet work in macro calls
* while editing the commandline, other buffers/registers may not be edited
(need push-down-list and auxiliary q-register)
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commandline macro)
* only works as part of commandline macro,
* at the beginning of other macros, it is treated like an arithmetic asterisk
* variables defined in cmdline.cpp are now declared by new cmdline.h
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