Lua - load properties into table





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I would like to load a config.lua file containing global variables so that I can wrap and then access those variables into a local table.



config.lua looks like this:



prop01=value01
prop02=value02


script.lua would look like this



-- fragment starts --
local config = {
-- something goes here
}
-- fragment end --

print (config.prop01) -- should print "value01"
print (config.prop02) -- should print "value02"


How can I change the "fragment" to get expected printout?










share|improve this question





























    1















    I would like to load a config.lua file containing global variables so that I can wrap and then access those variables into a local table.



    config.lua looks like this:



    prop01=value01
    prop02=value02


    script.lua would look like this



    -- fragment starts --
    local config = {
    -- something goes here
    }
    -- fragment end --

    print (config.prop01) -- should print "value01"
    print (config.prop02) -- should print "value02"


    How can I change the "fragment" to get expected printout?










    share|improve this question

























      1












      1








      1








      I would like to load a config.lua file containing global variables so that I can wrap and then access those variables into a local table.



      config.lua looks like this:



      prop01=value01
      prop02=value02


      script.lua would look like this



      -- fragment starts --
      local config = {
      -- something goes here
      }
      -- fragment end --

      print (config.prop01) -- should print "value01"
      print (config.prop02) -- should print "value02"


      How can I change the "fragment" to get expected printout?










      share|improve this question














      I would like to load a config.lua file containing global variables so that I can wrap and then access those variables into a local table.



      config.lua looks like this:



      prop01=value01
      prop02=value02


      script.lua would look like this



      -- fragment starts --
      local config = {
      -- something goes here
      }
      -- fragment end --

      print (config.prop01) -- should print "value01"
      print (config.prop02) -- should print "value02"


      How can I change the "fragment" to get expected printout?







      properties lua






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 24 '18 at 14:20









      mpalmier73mpalmier73

      102




      102
























          1 Answer
          1






          active

          oldest

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          1














          Swap the environment when loading the config file.



          In lua 5.3 it is done using functions load or loadfile documented here:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file",config)
          config_init_fun()


          In lua 5.1 you will need to use setfenv function:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file")
          config_init_fun = setfenv (config_init_fun, config)
          config_init_fun()


          The assignment of setfenv result might be unnecessary but I don't have lua5.1 at hand to verify that.



          All that assuming that config.lua is a valid script that is setting some global variables.






          share|improve this answer
























          • Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

            – mpalmier73
            Nov 24 '18 at 17:28











          • The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

            – Dimitry
            Nov 25 '18 at 0:25












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          1 Answer
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          1 Answer
          1






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

          votes









          1














          Swap the environment when loading the config file.



          In lua 5.3 it is done using functions load or loadfile documented here:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file",config)
          config_init_fun()


          In lua 5.1 you will need to use setfenv function:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file")
          config_init_fun = setfenv (config_init_fun, config)
          config_init_fun()


          The assignment of setfenv result might be unnecessary but I don't have lua5.1 at hand to verify that.



          All that assuming that config.lua is a valid script that is setting some global variables.






          share|improve this answer
























          • Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

            – mpalmier73
            Nov 24 '18 at 17:28











          • The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

            – Dimitry
            Nov 25 '18 at 0:25
















          1














          Swap the environment when loading the config file.



          In lua 5.3 it is done using functions load or loadfile documented here:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file",config)
          config_init_fun()


          In lua 5.1 you will need to use setfenv function:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file")
          config_init_fun = setfenv (config_init_fun, config)
          config_init_fun()


          The assignment of setfenv result might be unnecessary but I don't have lua5.1 at hand to verify that.



          All that assuming that config.lua is a valid script that is setting some global variables.






          share|improve this answer
























          • Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

            – mpalmier73
            Nov 24 '18 at 17:28











          • The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

            – Dimitry
            Nov 25 '18 at 0:25














          1












          1








          1







          Swap the environment when loading the config file.



          In lua 5.3 it is done using functions load or loadfile documented here:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file",config)
          config_init_fun()


          In lua 5.1 you will need to use setfenv function:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file")
          config_init_fun = setfenv (config_init_fun, config)
          config_init_fun()


          The assignment of setfenv result might be unnecessary but I don't have lua5.1 at hand to verify that.



          All that assuming that config.lua is a valid script that is setting some global variables.






          share|improve this answer













          Swap the environment when loading the config file.



          In lua 5.3 it is done using functions load or loadfile documented here:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file",config)
          config_init_fun()


          In lua 5.1 you will need to use setfenv function:



          local config={}
          local config_init_fun = loadfile('config.lua',"configuration file")
          config_init_fun = setfenv (config_init_fun, config)
          config_init_fun()


          The assignment of setfenv result might be unnecessary but I don't have lua5.1 at hand to verify that.



          All that assuming that config.lua is a valid script that is setting some global variables.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 24 '18 at 15:35









          DimitryDimitry

          9741616




          9741616













          • Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

            – mpalmier73
            Nov 24 '18 at 17:28











          • The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

            – Dimitry
            Nov 25 '18 at 0:25



















          • Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

            – mpalmier73
            Nov 24 '18 at 17:28











          • The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

            – Dimitry
            Nov 25 '18 at 0:25

















          Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

          – mpalmier73
          Nov 24 '18 at 17:28





          Your solution works for me. I'm using Lua 5.1.5 and confirm that setfenv is necessary. Thanks!

          – mpalmier73
          Nov 24 '18 at 17:28













          The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

          – Dimitry
          Nov 25 '18 at 0:25





          The remark is not about setfenv itself, it is needed without a doubt. What I don't know is whether setfenv alters the passed function or creates copy. That is, can fun=setfenv( fun, env ) be replaced by simply setfenv( fun, env )? Probably it can, but I did not test that.

          – Dimitry
          Nov 25 '18 at 0:25




















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