* The teco_qreg_vtable_t::get_string() method should support returning the length optionally (may be NULL). This already worked with teco_doc_get_string(), even though it wasn't documented, and therefore didn't cause problems with regular Q-Registers.
* As known from DEC TECO, but extended to convert absolute positions to line numbers as well. :^Q returns the current line. * Especially useful in macros that accept line arguments, as it is much shorter than something like ^E@ES/LINEFROMPOSITION//+Q.l@ES/POSITIONFROMLINE//:^E-. * On the other hand, the fact that ^Q checks the line range means we cannot easily replace lexer.checkheader with something like [:J 0,^Q::S...$ ]: Using SCI_POSITIONFROMLINE still has the advantage that it returns `Z` for out-of-bounds ranges which would be cumbersome to write with the current ^Q. * Perhaps there should be a separate command for converting between absolute lines and positions and :^Q should be repurposed to return a failure boolean for out-of-range values? * fnkeys.tes could be simplified.
* The colon modifier can now occur 2 times. Specifying `@` more than once or `:` more than twice is an error now. * Commands do not check for excess colon modifiers - almost every command would have to check it. Instead, a double colon will simply behave like a single colon on most commands. * All search commands inherit the anchored semantics, but it's not very useful in some combinations like -::S, ::N or ::FK. That's why the `::` variants are not documented everywhere. * The lexer.checkheader macro could be simplified and should also be faster now, speeding up startup. Eventually this macro can be made superfluous, e.g. by using 1:FB or 0,1^Q::S.
* Can be freely combined with the colon-modifier as well. :@Xq cut-appends to register q. * This simply deletes the given buffer range after the copy or append operation as if followed by another <K> command. * This has indeed been a very annoying missing feature, as you often have to retype the range for a K or D command. At the same time, this cannot be reasonably solved with a macro since macros do not accept Q-Register arguments -- so we would have to restrict ourselves to one or a few selected registers. I was also considering to solve this with a special stack operation that duplicates the top values, so that Xq leaves arguments for K, but this couldn't work for cutting lines and would also be longer to type. * It's the first non-string command that accepts @. Others may follow in the future. We're approaching ITS TECO madness levels.
* Allows storing pattern matches into Q-Registers (^YXq). * You can also refer to subpatterns marked by ^E[...] by passing a number > 0. This is equivalent to \0-9 references in many programming languages. * It's especially useful for supporting TECO's equivalent of structural regular expressions. This will be done with additional macros. * You can also simply back up to the beginning of an insertion or search. So I...$^SC leaves dot at the beginning of the insertion. S...$^SC leaves dot before the found pattern. This has been previously requested by users. * Perhaps there should be ^Y string building characters as well to backreference in search-replacement commands (TODO). This means that the search commands would have to store the matched text itself in teco_range_t structures since FR deletes the matched text before processing the replacement string. It could also be made into a FR/FS-specific construct, so we don't fetch the substrings unnecessarily. * This differs from DEC TECO in always returning the same range even after dot movements, since we are storing start/end byte positions instead of only the length. Also DEC TECO does not support fetching subpattern ranges.
* Using teco_expressions_eval() is wrong since it does not pay attention to precedences. If you have multiple higher precedence operators in a row, as in 2+3*4*5, the lower precedence operators would be resolved prematurely. * Instead we now call teco_expressions_calc() repeatedly but only for lower precedence operators on the stack top. This makes sure that as much of the expression as possible is evaluated at any given moment.
* It was possible to provoke operator right-associativity when placing a high-precedence operator between two low-precedence operators. 1-6*5-1 evaluated to -28 instead of the expected -30. * The reason is that SciTECO relies on operators to be resolved from left-to-right as soon as possible. The higher precedence operator prevents that and pushing the 2nd "-" only evaluated 6*5. At the end 1-30-1 would be left on the stack. teco_expressions_eval() however evaluates from right-to-left which is wrong in this case. * Instead, we now do a full eval on every operator with a lower precedence, making sure that 1-30 is evaluated first.
* We cannot call it "." since that introduces a local register and we don't want to add an unnecessary syntactic exception. * Allows the idiom [: ... ]: to temporarily move around. Also, you can now write ^E\: without having to store dot in a register first. * In the future we might add an ^E register as well for byte offsets. However, there are much fewer useful applications. * Of course, you can now also write nU: instead of nJ, Q: instead of "." and n%: instead of "nC.". However it's all not really useful.
* This would actually causes crashes when trying to format numbers. * The ^R local register has a custom set_integer() method now, so that the check is performed also when using nU.^X.
* This way the search mode and radix are local to the current macro frame, unless the macro was invoked with :Mq. If colon-modified, you can reproduce the same effect by calling [.^X 0^X ... ].^X * The radix register is cached in the Q-Reg table as an optimization. This could be done with the other "special" registers as well, but at the cost of larger stack frames. * In order to allow constructs like [.^X typed with upcarets, the Q-Register specification syntax has been extended: ^c is the corresponding control code instead of the register "^".