//: You guessed right: the '000' prefix means you should start reading here. //: //: This project is setup to load all files with a numeric prefix. Just create //: a new file and start hacking. //: //: The first few files (00*) are independent of what this program does, an //: experimental skeleton that will hopefully make it both easier for others to //: understand and more malleable, easier to rewrite and remould into radically //: different shapes without breaking in subtle corner cases. The premise is //: that understandability and rewrite-friendliness are related in a virtuous //: cycle. Doing one well makes it easier to do the other. //: //: Lower down, this file contains a legal, bare-bones C++ program. It doesn't //: do anything yet; subsequent files will add behaviors by inserting lines //: into it with directives like: //: :(after "more events") //: This will insert the following lines after a line in the program containing //: the words "more events". //: A simple tool will 'tangle' these files according to the directives, though //: it'll drop these comments starting with a '//:' prefix that only make sense //: in the context of layers. //: //: Directives free up the programmer to order code for others to read rather //: than as forced by the computer or compiler. Each individual feature can be //: organized in a self-contained 'layer' that adds code to many different data //: structures and functions all over the program. The right decomposition into //: layers will let each layer make sense in isolation. //: //: "If I look at any small part of it, I can see what is going on -- I don't //: need to refer to other parts to understand what something is doing. //: //: If I look at any large part in overview, I can see what is going on -- I //: don't need to know all the details to get it. //: //: Every level of detail is as locally coherent and as well thought-out as //: any other level." //: //: -- Richard Gabriel, "The Quality Without A Name" //: (http://dreamsongs.com/Files/PatternsOfSoftware.pdf, page 42) //: //: Directives are powerful; they permit inserting or modifying any point in //: the program. Using them tastefully requires mapping out specific lines as //: waypoints for future layers to hook into. Often such waypoints will be in //: comments, capitalized to hint that other layers rely on their presence. //: //: A single waypoint might have many different code fragments hooking into //: it from all over the codebase. Use 'before' directives to insert //: code at a location in order, top to bottom, and 'after' directives to //: insert code in reverse order. By convention waypoints intended for insertion //: before begin with 'End'. Notice below how the layers line up above the "End //: Foo" waypoint. //: //: File 001 File 002 File 003 //: ============ =================== =================== //: // Foo //: ------------ //: <---- :(before "End Foo") //: .... //: ... //: ------------ //: <---------------------------- :(before "End Foo") //: .... //: ... //: // End Foo //: ============ //: //: Here's part of a layer in color: http://i.imgur.com/0eONnyX.png. Directives //: are shaded dark. Notice the references to waypoints lower down in this //: file. //: //: Layers do more than just shuffle code around. Past the initial skeleton of //: this program (currently 00*-02*), it ought to be possible to stop loading //: after any file/layer, build and run the program, and pass all tests for //: loaded features. (Relevant is http://youtube.com/watch?v=c8N72t7aScY, a //: scene from "2001: A Space Odyssey".) //: //: This 'subsetting guarantee' ensures that this directory contains a //: cleaned-up narrative of the evolution of this codebase. Organizing //: autobiographically allows a newcomer to rapidly orient himself, reading the //: first few files to understand a simple gestalt of a program's core purpose //: and features, and later gradually working his way through other features as //: the need arises. Each step should be as simple as possible (but no simpler). //: //: Programmers shouldn't need to understand everything about a program to hack //: on it. But they shouldn't be prevented from a thorough understanding of //: each aspect either. The goal of layers is to reward curiosity. // Includes // End Includes // Types // End Types // prototypes are auto-generated; define your functions in any order #include "function_list" // by convention, files ending with '_list' are auto-generated // Globals // End Globals int main(int argc, char* argv[]) { // End One-time Setup // End Commandline Parsing return 0; // End Main } void setup() { // End Setup } //: Without directives or with the :(code) directive, lines get added at the //: end.