* New [unused assignment linter](http://moonscript.org/reference/command_line.html#unused_variable_assigns) finds assignments that are never referenced after being defined.
## Parsing Updates
Whitespace parsing has been relaxed in a handful of locations:
* You can put unrestricted whitespace/newlines after operator in a binary operator before writing the right hand side. The following are now valid:
```moonscript
x = really_long_function! +
2304
big_math = 123 /
12 -
43 * 17
bool_exp = nice_shirt and cool_shoes or
skateboard and shades
```
* You can put unrestricted whitespace/newlines immediately after an opening parenthesis, and immediately before closing parenthesis. The following are now valid:
```moonscript
hello = 100 + (
var * 0.23
) - 15
funcall(
"height", "age", "weight"
)
takes_two_functions (->
print "hello"
), ->
print "world"
```
* You can put unrestricted whitespace/newlines immediately after a `:` when defining a table literal. The following is now valid:
```moonscript
x = {
hello:
call_a_function "football", "hut"
}
```
## Code Generation
* Single value `import`/`destructure` compiles directly into single assignment
## Bug Fixes
* Some `moonc` command line flags were being ignored
* Linter would not report global reference when inside self assign in table
* Fixed an issue where parser would crash in Lpeg 0.12 when compiling hundreds of times per process
* The way the subtraction operator works has changed. There was always a little confusion as to the rules regarding whitespace around it and it was recommended to always add whitespace around the operator when doing subtraction. Not anymore. Hopefully it now [works how you would expect](http://moonscript.org/reference/#considerations). (`a-b` compiles to `a - b` and not `a(-b)` anymore).
* The `moon` library is no longer sets a global variable and instead returns the module. Your code should now be:
* Generated code will reuse local variables when appropriate. Local variables are guaranteed to not have side effects when being accessed as opposed to expressions and global variables. MoonScript will now take advantage of this and reuse those variable without creating and copying to a temporary name.
* Reduced the creation of anonymous functions that are called immediately.
MoonScript uses this technique to convert a series of statements into a single expression. It's inefficient because it allocates a new function object and has to do a function call. It also obfuscates stack traces. MoonScript will flatten these functions into the current scope in a lot of situations now.
* Reduced the amount of code generated for classes. Parent class code it left out if there is no parent.
## New Things
* You can now put line breaks inside of string literals. It will be replaced with `\n` in the generated code.
* Added `moonscript.base` module. It's a way of including the `moonscript` module without automatically installing the moonloader.
* You are free to use any whitespace around the name list in an import statement. It has the same rules as an array table, meaning you can delimit names with line breaks.
* Added significantly better tests. Previously the testing suite would only verify that code compiled to an expected string. Now there are unit tests that execute the code as well. This will make it easier to change the generated output while still guaranteeing the semantics are the same.
## Bug Fixes
*`b` is not longer treated as self assign in `{ a : b }`
* load functions will return `nil` instead of throwing error, as described in documentation
* fixed an issue with `moon.mixin` where it did not work as described
# MoonScript v0.2.3-2 (2013-01-29)
Fixed bug with moonloader not loading anything
# MoonScript v0.2.3 (2013-01-24)
## Changes
* For loops when used as expressions will no longer discard nil values when accumulating into an array table. **This is a backwards incompatible change**. Instead you should use the `continue` keyword to filter out iterations you don't want to keep. [Read more here](https://github.com/leafo/moonscript/issues/66).
* The `moonscript` module no longer sets a global value for `moonscript` and instead returns it. You should update your code:
* Added `local *` (and `local ^`) for [hoisting variable declarations](http://moonscript.org/reference/#local_statement) in the current scope
* List comprehensions and line decorators now support numeric loop syntax
## Bug Fixes
* Numbers that start with a dot, like `.03`, are correctly parsed
* Fixed typo in `fold` library function
* Fix declaration hoisting inside of class body, works the same as `local *` now
## Other Stuff
MoonScript has [made its way into GitHub](https://github.com/github/linguist/pull/246). `.moon` files should start to be recognized in the near future.
# MoonScript v0.2.2 (2012-11-03)
## Changes
* Compiled [files will now implicitly return](http://moonscript.org/reference/#implicit_returns_on_files) their last statement. Be careful, this might change what `require` returns.
## New Things
### The Language
* Added [`continue` keyword](http://moonscript.org/reference/#continue) for skipping the current iteration in a loop.
* Added [`do` expression and block](http://moonscript.org/reference/#do).
* Added `unless` as a block and line decorator. Is the inverse of `if`.
* Assignment can be used in an [`if` statement's expression](http://moonscript.org/reference/#with_assignment).
* Added `or=` and `and=` operators.
*`@@` can be prefixed in front of a name to access that name within `self.__class`
*`@` and `@@` can be [used as values](http://moonscript.org/reference/#_and__values) to reference `self` and `self.__class`.
* In class declarations it's possible to [assign to the class object](http://moonscript.org/reference/#class_variables) instead of the instance metatable by prefixing the key with `@`.
* Class methods can access [locals defined within the body](http://moonscript.org/reference/#class_declaration_statements) of the class declaration.
* Super classes are [notified when they are extended](http://moonscript.org/reference/#inheritance) from with an `__inherited` callback.
* Classes can now [implicitly return and be expressions](http://moonscript.org/reference/#anonymous_classes).
*`local` keyword returns, can be used for forward declaration or shadowing a variable.
* String literals can be used as keys in [table literals](http://moonscript.org/reference/#table_literals).
* Call methods on string literals without wrapping in parentheses: `"hello"\upper!`
* Table comprehensions can return a single value that is unpacked into the key and value.
* The expression in a [`with` statement can now be an assignment](http://moonscript.org/reference/#with_statement), to give a name to the expression that is being operated on.
### The API
* The `load` functions can take an [optional last argument of options](http://moonscript.org/reference/#load_functions).
### The Tools
* The [online compiler](http://moonscript.org/compiler/) now runs through a web service instead of emscripten, should work reliably on any computer now.
* [Windows binaries](http://moonscript.org/bin/) have been updated.
## Bug Fixes
* Significantly improved the [line number rewriter](http://moonscript.org/reference/#error_rewriting). It should now accurately report all line numbers.
* Generic `for` loops correctly parse for multiple values as defined in Lua.
* Update expressions don't fail with certain combinations of precedence.
* All statements/expressions are allowed in a class body, not just some.
*`x = "hello" if something` will extract the declaration of `x` if it's not in scope yet. Preventing an impossible to access variable from being created.
* varargs, `...`, correctly bubble up through automatically generated anonymous functions.
* Compiler doesn't crash if you try to assign something that isn't assignable.
* Numerous other small fixes. See [commit log](https://github.com/leafo/moonscript/commits/master).
# MoonScript v0.2.0 (2011-12-12)
## Changes
*`,` is used instead of `:` for delimiting table slice parts.
* Class objects store the metatable of their instances in `__base`. `__base` is also used in inheritance when chaining metatables.
## New Things
### The Language
* Added [key-value table comprehensions][4].
* Added a [`switch` statement][7].
* The body of a class can contain arbitrary expressions in addition to assigning properties. `self` in this scope refers to the class itself.
* Class objects themselves support accessing the properties of the superclass they extend (like instances).
* Class objects store their name as a string in the `__name` property.
* [Enhanced the `super` keyword][8] in instance methods.
* Bound methods can be created for an object by using `object\function_name` as a value. Called [function stubs][6].
* Added `export *` statement to export all assigned names following the statement.
* Added `export ^` statement to export all assigning names that begin with a capital letter following the statement.
*`export` can be used before any assignment or class declaration to export just that assignment (or class declaration).
* Argument lists can be broken up over several lines with trailing comma.
*`:hello` is short hand for `hello: hello` inside of table literal.
* Added `..=` for string concatenation.
*`table.insert` no longer used to build accumlated values in comprehensions.
### The API
* Added `loadfile`, `loadstring`, and `dofile` functions to `moonscript` module to load/run MoonScript code.
* Added `to_lua` function to `moonscript` module to convert a MoonScript code string to Lua string.
### The Tools
* Created [prebuilt MoonScript Windows executables][2].
* Wrote a [Textmate/Sublime Text bundle][9].
* Wrote a [SciTE syntax highlighter with scintillua][10].
* Created a [SciTE package for Windows][11] that has everything configured.
* Created an [online compiler and snippet site][12] using [emscripten][13].
* Watch mode works on all platforms now. Uses polling if `inotify` is not
available.
### Standard Library
I'm now including a small set of useful functions in a single module called `moon`:
* Fixed issues when using `...` within comprehensions when the compiled code uses an intermediate function in the output.
* Names whose first characters happen to be a keyword don't break parser.
* Return statement can have no arguments
* argument names prefixed with `@` in function definitions work outside of classes work with default values.
* Fixed parse issues with the shorthand values within a `with` block.
* Numerous other small fixes. See [commit log][5].
## Other Stuff
Since the first release, I've written one other project in MoonScript (other than the compiler). It's a static site generator called [sitegen][15]. It's what I now use to generate all of my project pages and this blog.
