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Make globals persistent in = calculator

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The expression evaluation environment is now persistent across an
interactive calculator session to allow easily using "global" variables.
This commit is contained in:
Talia 2020-04-14 10:58:21 +02:00
parent fd0f08754b
commit 9f09d45bfa
1 changed files with 14 additions and 12 deletions
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26
bin/=
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@ -1,11 +1,22 @@
#!/usr/bin/env luajit
banner = [[
local env = setmetatable({}, {__index = function(self, key)
return math[key] or _G[key] or nil
end})
env.banner = [[
Calculator (by DarkWiiPlayer)
License: the Unlicense (type 'license')
]]
license = [[
env.help = [[
This is a simple terminal calculator written in Lua.
Call without arguments for an interactive shell.
Call with `-` argument for a multiline calculation.
Call with any other argument for inline calculation.
]]
env.license = [[
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
@ -30,13 +41,6 @@ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
]]
help = [[
This is a simple terminal calculator written in Lua.
Call without arguments for an interactive shell.
Call with `-` argument for a multiline calculation.
Call with any other argument for inline calculation.
]]
local moonscript = pcall(function()
require 'moonscript.base'
end)
@ -52,9 +56,7 @@ local function run(line, name, addreturn)
if addreturn~=false and not moonscript then
line = "return ("..line..")"
end
local expression = assert(load(parse(line), name, 't', setmetatable({}, {__index = function(self, key)
return math[key] or _G[key] or nil
end})))
local expression = assert(load(parse(line), name, 't', env))
success, math.ans = xpcall(expression, print)
print(math.ans)
end