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_en/basics/lua.md
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@ -28,7 +28,7 @@ to assist with this, and some techniques which you may find useful.
A code editor with code highlighting is sufficient for writing scripts in Lua. A code editor with code highlighting is sufficient for writing scripts in Lua.
Code highlighting uses different colours for words and characters Code highlighting uses different colours for words and characters
depending on what they represent. This allows you to more easily notice depending on what they represent. This allows you to easily notice
mistakes and inconsistencies. mistakes and inconsistencies.
For example: For example:
@ -49,8 +49,8 @@ function ctf.post(team,msg)
end end
``` ```
Keywords in this code are highlighted including `if`, `then`, `end`, and `return`. Keywords in this example are highlighted, including `if`, `then`, `end`, and `return`.
Functions which comes with Lua by default, such as `table.insert` are also highlighted. Functions which come with Lua by default, such as `table.insert`, are also highlighted.
Commonly used editors which are well-suited for Lua include: Commonly used editors which are well-suited for Lua include:
@ -62,27 +62,27 @@ Other suitable editors are also available.
### Integrated Programming Environments ### Integrated Programming Environments
Integrated development environments (IDEs) allow you to more easily debug code, Integrated development environments (IDEs) allow you to easily debug code,
but are often more difficult to set up than a simple text editor. but are often more difficult to set up than a simple text editor.
One such IDE is Eclipse, which can be used with the Koneki Lua plugin. One such IDE is Eclipse, which can be used with the Koneki Lua plugin.
To use this: To use Eclipse and the Koneki Lua plugin when writing Minetest mods:
* Install Eclipse and Koneki. * Install Eclipse and Koneki.
* Create a new Lua project from existing source (specify Minetest's base directory). * Create a new Lua project from existing source (specify Minetest's base directory).
* Follow instructions from Koneki wiki on how to "Attach to remote Application" debugging. * Follow the "Attach to remote Application" debugging instructions from Koneki wiki.
* It is suggested to add those lines from wiki at the beginning of builtin.lua. * It is suggested to add those lines from wiki at the beginning of builtin.lua.
* Start the debugger. (Set "Break on first line" in debugger configuration to see if it is working). * Start the debugger. (Set "Break on first line" in debugger configuration to see if it is working).
* Start Minetest. * Start Minetest.
* Enter the game to startup Lua. * Enter the game to start Lua.
## Coding in Lua ## Coding in Lua
### Program Flow ### Program Flow
Programs are a series of commands that run one after another. Programs are a series of commands that run one after another.
We call these commands "statements." We call these commands "statements".
Program flow is how these statements are executed and different Program flow is how these statements are executed, and different
types of flow allow you to skip or jump over sets of commands. types of flow allow you to skip or jump over sets of commands.
There are three main types of flow: There are three main types of flow:
@ -102,7 +102,7 @@ a = a + 10
print("Sum is "..result) print("Sum is "..result)
``` ```
In this example `a`, `b`, and `result` are *variables*. Local variables are declared In this example, `a`, `b`, and `result` are *variables*. Local variables are declared
by using the `local` keyword, and then given an initial value. by using the `local` keyword, and then given an initial value.
Local will be discussed later, because it's part of a very important concept called Local will be discussed later, because it's part of a very important concept called
*scope*. *scope*.
@ -271,7 +271,7 @@ see what it is. In this example, the foo variable will be printed as "bar", incl
which show it is a string. This reveals that the foo variable was global, because it could be which show it is a string. This reveals that the foo variable was global, because it could be
accessed from another function than the one in which it was declared. accessed from another function than the one in which it was declared.
This is sloppy coding, and Minetest will in warn about this: This is sloppy coding, and Minetest will warn about this:
Assignment to undeclared global 'foo' inside function at init.lua:2 Assignment to undeclared global 'foo' inside function at init.lua:2