add Lua support

README.md

@@ -38,7 +38,7 @@ repository.
   - [Bash](https://www.gnu.org/software/bash/),
     [Cmd](https://en.wikipedia.org/wiki/Cmd.exe),
     [PowerShell](https://en.wikipedia.org/wiki/PowerShell),
-    [Python](https://www.python.org/),
+    [Python](https://www.python.org/), [Lua](http://www.lua.org/),
     [Haskell](https://www.haskell.org/) and
     [R](https://www.r-project.org/) scripts
 
@@ -360,6 +360,8 @@ preprocessing it.
     `!python2(CMD)` executes `CMD` with Python 2.
   - **`python3`**  
     `!python3(CMD)` executes `CMD` with Python 3.
+  - **`lua`**  
+    `!lua(CMD)` executes `CMD` with Lua.
   - **`haskell`**  
     `!haskell(CMD)` executes `CMD` as a Haskell script with
     `runhaskell`.
@@ -825,7 +827,7 @@ Once generated the image looks like:
 
 This script outputs:
 
-    Hi, I'm /bin/bash 4.4.19(1)-release
+    Hi, I'm /bin/bash 4.4.23(1)-release
     Here are a few random numbers: 17766, 11151, 23481
 
 **Note**: the keyword `sh` executes `sh` which is generally a link to
@@ -852,7 +854,7 @@ This script outputs:
 
     Hi, I'm C:\windows\system32\cmd.exe
 
-    Microsoft Windows 10.0.15063 (3.8)
+    Microsoft Windows 10.0.15063 (3.11)
     This script is run from wine under Linux
 
 ### Python
@@ -878,6 +880,24 @@ This script outputs:
     [GCC 8.1.1 20180502 (Red Hat 8.1.1-1)]
     Here are a few random numbers: 640, 25, 275
 
+### Lua
+
+[Lua](http://www.lua.org/) is executed when the keyword `lua` is used.
+
+    !lua
+    ~~~~~
+    print("Hi, I'm ".._VERSION)
+    math.randomseed(42)
+    t = {}
+    for i = 1, 3 do table.insert(t, math.random(0, 999)) end
+    print("Here are a few random numbers: "..table.concat(t, ", "))
+    ~~~~~
+
+This script outputs:
+
+    Hi, I'm Lua 5.3
+    Here are a few random numbers: 329, 690, 422
+
 ### Haskell
 
 [Haskell](https://www.haskell.org/) is executed when the keyword
@@ -903,7 +923,7 @@ This script outputs:
 
 This script outputs:
 
-    Hi, I'm Haskell 8.2
+    Hi, I'm Haskell 8.4
     The first 10 prime numbers are: 2 3 5 7 11 13 17 19 23 29
 
 ### Stack
@@ -914,7 +934,7 @@ beginning of the script.
 
     !stack
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-    {- stack script --resolver lts-11.8 --package base -}
+    {- stack script --resolver lts-12.0 --package base -}
 
     import System.Info
     import Data.Version
@@ -934,7 +954,7 @@ beginning of the script.
 
 This script outputs:
 
-    Hi, I'm Haskell 8.2
+    Hi, I'm Haskell 8.4
     The first 10 prime numbers are: 2 3 5 7 11 13 17 19 23 29
 
 ### R (script)

doc/img/pp-scripts.dot

@@ -11,6 +11,7 @@ digraph {
     Bash [shape=box label="bash"]
     Sh [shape=box label="sh"]
     Python [shape=box label="python"]
+    Lua [shape=box label="lua"]
     Haskell [shape=box label="runhaskell"]
     Stack [shape=box label="stack"]
     Rscriptexe [shape=box label="Rscript"]
@@ -21,6 +22,7 @@ digraph {
     bash -> Bash
     sh -> Sh
     python -> Python
+    lua -> Lua
     haskell -> Haskell
     stack -> Stack
     Rscript -> Rscriptexe

doc/pp.md

@@ -24,6 +24,7 @@ The default macro execution character is redefined to avoid lots of `raw` calls
 [Cmd]: https://en.wikipedia.org/wiki/Cmd.exe
 [PowerShell]: https://en.wikipedia.org/wiki/PowerShell
 [Python]: https://www.python.org/
+[Lua]: http://www.lua.org/
 [Haskell]: https://www.haskell.org/
 [Stack]: https://docs.haskellstack.org/en/stable/README/
 [GitHub]: https://github.com/CDSoft/pp
@@ -48,7 +49,7 @@ And finally [PP] which merges the functionalities of [GPP] and [DPP].
 - literate programming
 - [GraphViz], [PlantUML] and [ditaa] diagrams
 - [Asymptote] and [R] figures
-- [Bash], [Cmd], [PowerShell], [Python], [Haskell] and [R] scripts
+- [Bash], [Cmd], [PowerShell], [Python], [Lua], [Haskell] and [R] scripts
 
 Open source
 ===========
@@ -472,6 +473,7 @@ digraph {
     Bash [shape=box label="bash"]
     Sh [shape=box label="sh"]
     Python [shape=box label="python"]
+    Lua [shape=box label="lua"]
     Haskell [shape=box label="runhaskell"]
     Stack [shape=box label="stack"]
     Rscriptexe [shape=box label="Rscript"]
@@ -482,6 +484,7 @@ digraph {
     bash -> Bash
     sh -> Sh
     python -> Python
+    lua -> Lua
     haskell -> Haskell
     stack -> Stack
     Rscript -> Rscriptexe
@@ -805,6 +808,31 @@ if __name__ == "__main__":
 ~~~~~
 ~~~~~~~~~~
 
+### Lua
+[Lua] is executed when the keyword `lua` is used.
+
+    !lua
+    ~~~~~
+    print("Hi, I'm ".._VERSION)
+    math.randomseed(42)
+    t = {}
+    for i = 1, 3 do table.insert(t, math.random(0, 999)) end
+    print("Here are a few random numbers: "..table.concat(t, ", "))
+    ~~~~~
+
+This script outputs:
+
+~~~~~~~~~~
+§lua
+~~~~~
+print("Hi, I'm ".._VERSION)
+math.randomseed(42)
+t = {}
+for i = 1, 3 do table.insert(t, math.random(0, 999)) end
+print("Here are a few random numbers: "..table.concat(t, ", "))
+~~~~~
+~~~~~~~~~~
+
 ### Haskell
 
 [Haskell] is executed when the keyword `haskell` is used.
@@ -855,7 +883,7 @@ In this case stack meta data must be added at the beginning of the script.
 
     !stack
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-    {- stack script --resolver lts-11.8 --package base -}
+    {- stack script --resolver lts-12.0 --package base -}
 
     import System.Info
     import Data.Version
@@ -878,7 +906,7 @@ This script outputs:
 ~~~~~~~~~~
 §stack
 ~~~~~
-{- stack script --resolver lts-11.8 --package base -}
+{- stack script --resolver lts-12.0 --package base -}
 
 import System.Info
 import Data.Version