Allow for lua scripts in local .sc directory

[rjungemann]

# Make a new project directory
mkdir sc-im-test
cd sc-im-test

# Add the lua script
mkdir lua
echo 'function trg(c,r)' >> lua/test.lua
echo '  sc.lsetstr(1,1,"String From Lua")' >> lua/test.lua
echo '  sc.sc("LET A2=5")' >> lua/test.lua
echo 'end' >> lua/test.lua

# Add the spreadsheet
echo 'set external_functions' >> test.sc
echo 'trigger a5 "mode=W type=LUA file=test.lua function=trg"' >> test.sc
echo 'goto A1' >> test.sc

# Finally, open the spreadsheet with `../sc-im/src/sc-im test.sc` or similar,
# and modify cell A5 to make sure Lua is called.

Open path/to/sc-im test.sc and change cell A5. This will trigger the lua script to run.

In order to get Lua support working on OS X, the compiler flags needed to be changed slightly. -Wl,--export-dynamic is not supported, -rdynamic must be used instead.

[andmarti1424]

This seems great. Could you please update doc file as well? If @roman65536 agrees, I will merge this.

[rjungemann]

Will do, thank you!

[roman65536]

look good to me.
@Roger let me know, if it all works correctly.

Ehh.. would you mind post the content of test2.lua as well ? For more details, take a look in example/lua, there are 2 example on trigger, stock.sc and getstock.lua on READ , which auto download from yahoo finance the stock prices and the other one trg_sql3.lua on WRITE, which inserts same values in to sqlite db. Both are examples.

As you can see there, the function should be defined as :
function trg(c, r )
..
..
end

where c,r is column and row of the triggered cell.

rgds
Roman

[andmarti1424]

And please @rjungemann, can you update the "doc" file as well?

[rjungemann]

Yep, after work I'll update the docs.

I renamed test2.lua to test.lua but didn't update my comment. I'll fix test.lua so it calls a function. But yes, I can see running dtruss (closest thing to strace in OS X) that it found the Lua file properly and I could see by changing the cell that the Lua script was evaluated.

[rjungemann]

@andmarti1424 @roman65536 this should be ready to go now. Docs and description have been updated. I'll look into modifying C external functions so they work in the same way in a separate PR.

Sorry for the delay. Work got busy.

[andmarti1424]

Thanks @rjungemann!

[andmarti1424]

Merged!