Destroyed Tutorial: Hacking the Nimrod compiler: Pragmas (markdown)

Tutorial:-Hacking-the-Nimrod-compiler:-Pragmas.md

@@ -1,73 +0,0 @@
-## Introduction
-As there are no tutorials (that I know of) on how to add new features to the nimrod
-compiler I have decided to make one, based on me implementing the `requires`
-pragma which will be used for Babel Packages.
-
-As with many tasks there are many tools that are very helpful, I have used
-the *nimgrep* tool which is in the tools/ directory in Nimrod's repository, but I'm sure you know of other tools which can be very helpful!
-
-## First steps
-The first thing I have decided to do was create a test file, it follows:
-
-    {.requires packageA "0.7" "0.9".}
-    echo("hi")
-  
-(It originally had a `..` between the two string literals, I decided to get rid
-of that because I noticed that pragmas don't support it, I might come back to it.)
-
-I then saved that file as *"pragmaTest.nim"* and compiled it with
-`nimrod c pragmaTest.nim`. This has caused `pragmaTest.nim(1, 10) Error: invalid pragma: requires`.
-
-The next step was quite obvious, searching for "invalid pragma:", `nimgrep --recursive --ext:nim "invalid\ pragma:"`,
-this only gives one result.
-
-    ../Nimrod/rod/msgs.nim
-      258:     errInvalidPragmaX: "invalid pragma: $1",
-
-After some more intellectual grepping and looking through files, I noticed that the pragma() function in pragmas.nim
-takes an argument called `validPragmas` this lead me to *semtypes.nim* and *semstmts.nim* 
-after searching for (yes, you've guessed it) `pragma(`(please note this needs escaping when used as a regex).
-
-There was many `pragma` calls, I have looked at most of them and since I wanted
-a "global"(not sure if that's the correct term) pragma, for example
-`{.warning: "warning".}`. The `pragma` function is called with many different
-valid pragma groups. There is among many others, `stmtPragmas`, which is what
-I wanted, it's defined in *pragmas.nim*.
-
-## Hacking the code!
-I found where `TSpecialWords` is defined(*wordrecg.nim*) and added `wRequires`
-there, to the `specialWords` array below, and also to `stmtPragmas`. I then added `wRequires` to the case statement in the `pragma` function in *pragmas.nim*.
-
-This is where the `debug` function came into play, it is a function that pretty prints a 
-node in the AST, it is very useful. I added two `debug` calls one for the 'it' node
-and another one for the 'n' node.
-
-I then bootstrapped by executing `./koch boot`. After I got the beautiful "SUCCESS",
-I compiled *pragmaTest.nim*. And I got this output: 
-
-    {
-      "kind": "nkIdent",
-      "ident": "requires"
-    }
-    {
-      "kind": "nkPragma",
-      "sons": [
-        {
-          "kind": "nkIdent",
-          "ident": "requires"
-        },
-        {
-          "kind": "nkIdent",
-          "ident": "packageA"
-        },
-        {
-          "kind": "nkStrLit",
-          "strVal": "0.7"
-        },
-        {
-          "kind": "nkStrLit",
-          "strVal": "0.9"
-        }
-      ]
-    }
-