A small script written in D that replaces LESS style variables in a file.

replace-css-vars.d

// compile with: gdmd -O -inline -release -noboundscheck replace-css-vars.d
// usage: ./replace-css-vars text.less
import std.stdio, std.file, std.regex, std.string;

string FILE;

// empty a line
string clearLine(string content, string subject) {
  auto com = regex(subject, "g");
  auto newcontent = replaceAll(content, com, "");
  return newcontent;
}

// replace the variables with their values
string replaceVars(string content, string[] parts) {
  auto com = regex(parts[0], "g");
  auto newcontent = replaceAll(content, com, parts[1]);
  return newcontent;
}

string findVars(Captures!(string) contents) {
  // remove the variable declaration
  FILE = clearLine(FILE, contents.hit);
  // split the capture by the :
  auto str = std.string.split(contents.captures[0], ':');
  // trim the trailing semi-colon on the declaration
  str[1] = chomp(strip(str[1]), ";");
  //writeln(str);
  FILE = replaceVars(FILE, str);
  //return std.string.toUpper(contents.hit);
  return FILE;
}

string readFile(char[] filename) {
  if (exists(filename) != 0) {
    // ulong size = getSize(filename);
    return cast(string) read(filename);
  } else {
    writefln("File not found");
    assert(0);
  }
}

int main(char[][] args) {
  // first argument is the file
  FILE = readFile(args[1]);
  // main variable swap function
  enum reg = ctRegex!(`^(?:@)(?:.*)(?:\:)(?: )?(?:.*)(?:;)$`, "m");
  auto s = replaceAll!(findVars)(FILE, reg);
  FILE = strip(FILE);
  writeln(FILE);
  return 0;
}