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While memory consumption should be improved, backward searches
will still be slow, because they are implemented in terms of
repeated forward searches. It needs to be investigated whether
the underlying automaton can have its transitions reversed and
essentially run backwards, as is the case in sam.
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We generally omit parameter names in function prototypes when their
meaning is clear.
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For those not familiar with sam(1) more information can be found at
http://sam.cat-v.org/
For now sam commands can be entered from the vis prompt via :sam <cmd>
A command behaves differently depending on the mode in which it is issued:
- in visual mode it behaves as if an implicit extract x command
matching the current selection(s) would be preceding it. That is
the command is executed once for each selection.
- in normal mode:
* if an address for the command was provided it is evaluated starting
from the current cursor position(s) i.e. dot is set to the current
cursor position.
* if no address was supplied to the command then:
+ if multiple cursors exist, the command is executed once for every
cursor with dot set to the current line of the cursor
+ otherwise if there is only 1 cursor then the command is executed
with dot set to the whole file
The command syntax was slightly tweaked to accpet more terse commands.
- When specifiying text or regular expressions the trailing delimiter can
be elided if the meaning is unambigious.
- If only an address is provided the print command will be executed.
- The print command creates a selection matching its range.
- In text entry \t inserts a literal tab character (sam only recognizes \n).
Hence the sam command ,x/pattern/ can be abbreviated to x/pattern
If a command is successful vis switches to normal mode (and hence removes
any selections), otherwise the editor is kept in visual mode. The print
command "fails" by definition.
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Eventually this should probably be rewritten to use an iternal
regex engine, currently it has unacceptable memory usage, it
copies the whole text.
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