/**
 *Some little program  for finding and prettyprinting //TODO comments.
 * 
 *License: the MIT-License also known as X11-License
 *Copyright: (c) 2010 Marcel Fischer
 */

module todo;

import std.string : strip, chomp, find, ifind, format;
import std.stream : BufferedFile;
import std.stdio;
static import std.file;
static import std.path;


//I use string only for pseudo immutables for compa with D2

//private char[][string] todos;
private char[] todos="";
private char[] highPrioTodos="";
private int count = 0;
private char[] exts = "";

private string versionnum = "0.1";
debug private string versiontext= "BETA DEBUG";
else  private string versiontext= "BETA";

/*
//Use std.path.sep instead
version(Windows) { private const string seperator = "\\";}
version(Linux)   { private const string seperator = "/"; }
static assert(is(typeof(seperator)));
*/
alias std.path.sep seperator; 

void main(string[] args) {  
  showInit();
  standardExts();
  debug writefln("StExts: %s", exts);
  if(args.length <= 1) {
    
  } else {
    foreach(arg; args[1..$]) {
      if(!std.file.exists(arg)) {
        writefln("%s doesn't exist!",arg);
        continue;
      }
      search(arg);
    }
    printResults();
  }
}

void showInit() {
  writefln("Todo written by Marcel Fischer");
  writefln("Version %s %s\n", versionnum, versiontext);
}

void standardExts() {
  exts ~= "{d}{di}{c}{cpp}{h}{hpp}{cxx}{py}{rb}{pl}{php}{php5}{cs}{java}{tex}";
}

void showHelp() {
  //TODO write showHelp() ;-)
}

void search(string path) {
  //The path has to exist
  assert(std.file.exists(path)); 
  debug writef("\nSearching in %s...",path);
  
  //When it's a directory
  if(std.file.isdir(path)) {
    debug writefln(" it's directory");
    
    //recursively seach in subdirectorys
    auto entrys = std.file.listdir(path);
    foreach(entry; entrys) {
      if(entry != "." && entry != "..")
        search(path ~  seperator ~ entry);
    }
    
    
  //when it's a file
  } else if (std.file.isfile(path)){
    debug writefln(" it's file");
    //if file is not a programming file
    if(! find(exts, format("{%s}", std.path.getExt(path)) ) >= 0) {
      debug writef("ignore: %s", format("{%s}", std.path.getExt(path)));
      return;
    }

    BufferedFile file = new BufferedFile(path);
    scope(exit) file.close();
    char[] line = "";      //the current line
    int linenum = 0;       //linenumber
    bool highPrio = false; //if high priority
    
    while(!file.eof()) {
      line = file.readLine();
      linenum++;
      debug writef(" %s ",linenum);
      highPrio = false;
      
      int index = ifind(line, "//TODO");
      if(index >= 0) {
        //Take the line after todo
        line = line[index+("//TODO".length)..$];
        line = strip(chomp(line));
        if(line[0] == "$"[0]) {
          highPrio = true;
          line = line[1..$];
        }
        
        if(!highPrio)
          todos ~= createMessage(path,linenum,line);
        else
          highPrioTodos ~= createMessage(path,linenum,line); 
        count++;
      }
    }
  } else {
    assert(0); //File can't be neither a directory nor a file
  }
}


string createMessage(string path, int linenum, string message) {
  return format("  * %15s(%s): %s\n", std.path.getBaseName(path),
                linenum, message);
}

void printResults() {
  writefln("%s Results found\n",count);
  if(highPrioTodos.length > 0) 
    writefln("Todos with high priority:\n%s\n",highPrioTodos);
  if(todos.length > 0) 
    writefln("%sodos:\n%s\n", highPrioTodos.length > 0 ? "Other t" : "T", todos);
  if(highPrioTodos.length == 0 && todos.length == 0)
    writefln("Whoa, nothing left to do!");
}