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--[[
Simple calculator to evaluate selected text as a mathematical expression.
Only single-line constant expressions are supported, but you can do
some fairly complex calculations, e.g. sqrt(pi^2*sin(rad(45)))
--]]
-- Copy math functions to global namespace
for k,v in pairs(math) do _G[k] = math[k] end
-- Set window caption for some error messages
geany.banner="Calculator"
-- Grab any selected text
sel=geany.selection()
-- Do we have a selection ?
if (sel==nil) or (#sel==0) then
geany.message("Nothing selected.",
"Select a math expression in the\ncurrent document, and try again.")
return
end
-- Is our selection all on one line ?
if string.find(sel, "\n") then
geany.message("Too many lines!",
"Only single-line expressions are supported.")
return
end
-- Create a function call around the selected expression
func=assert(loadstring("return "..geany.selection()))
-- Did we get our function ?
if not func then
geany.message("Failed to parse expression.")
return
end
-- Call the function
answer=func()
-- Did we get an answer ?
if not answer then
geany.message("Failed to evaluate expression.")
return
end
-- Try to convert answer to a string
answer=tostring(answer)
-- Is the answer now a string?
if not answer then
geany.message("Failed to convert results to text.")
return
end
-- Replace current selection with our answer
geany.selection(answer)
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