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if vis actually wants to be a library exported symbols may need
mark up depending on the platform (eg. __declspec(dllexport)).
This needs to be hidden behind a macro because the way you export
is not the same on every platform.
I did this based on the assumption that vis.h was supposed to be
the only interface to the "vis" library. Since nobody actually
uses vis as a library I have no idea if this is actually correct.
Anyway marking up all prototypes like this allows for one to
convert all functions to static if a single translation unit is
used by inserting at the start:
#define VIS_INTERNAL static
#define VIS_EXPORT static
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This should fix segfaults for commands like `:{ q i/foo/ }` or
`:x/pattern/ q` where a command invalidates the current window.
The checks are a bit too strict, for example a destructive command at the
end of a non-nested group would be fine, but is currently also rejected.
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Properly detect unbalanced curly braces and spurious output at the
end of a group.
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:e without any argument can be used to reload the file from
disk whereas before a "Filename expected" error would be
displayed.
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The built in commands should always be available.
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Add infrastructure to handle commands which take file names,
shell commands or general white space delimited parameters
as arguments.
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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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