Find all versions of dependencies for dub.sdl and dub.json files off a subdirectory

checkdependencies.d

module kaleidic.util.checkdependencies;

/**
      Quick and dirty hack to find all versions referenced by dub.sdl and dub.json files off a subdirectory
      Written by Laeeth Isharc 2016
      Unlimited rights for use, redistribution, relicensing, republication granted to Sonke Ludwig and Rejected Software
      Let the user beware
*/
import std.stdio;
import std.string;
import std.process;
import std.path;
import std.exception;
import std.array:array;
import std.range:repeat;
import std.file;
import std.algorithm:sort,max,canFind;
import std.conv:to;
import dub.package_;
import dub.internal.vibecompat.inet.path;

struct Dependency
{
	string filename;
	string packageName;
	string ver;
}
int main(string[] args)
{
	Dependency[] deps;

	string baseDir;
	if (args.length>2)
	{
		writefln("syntax: extractdeps [base directory]");
		return 0;
	}
	baseDir=(args.length==1)?getcwd():args[1];
	writefln("extracting dependencies from %s",baseDir);
	foreach(entry;dirEntries(baseDir, "{dub.json,dub.sdl}",SpanMode.depth))
	{
		if (!entry.isFile)
			continue;
		if (entry.name.canFind("/.dub/"))
			continue;
		if (entry.name.baseName=="dub.sdl" || entry.name.baseName=="dub.json")
		{
			try
			{
				deps~=entry.name.extractDependencies();
			}
			catch(Exception e)
			{
				writefln("* could not open %s",entry.name);
			}
		}
	}
	deps=deps.sort!((a,b)=>(a.packageName<b.packageName && a.ver<b.ver)).array;
	foreach(dep;deps)
		writefln("%s\t%s\t%s",dep.packageName,
			dep.ver,dep.filename);
	
	return 1;
}
auto extractDependencies(string filename)
{
	Dependency[] ret;
	Package package_;
	auto dir=Path(filename.dirName);
	//writefln("* processing %s",filename);

	if (filename.baseName=="dub.json")
	{
		package_=new Package(dir,PathAndFormat(Path(filename),PackageFormat.json));
		foreach(entry;package_.dependencies.keys)
			ret~=Dependency(filename,entry,package_.dependencies[entry].to!string);
		return ret;
	}
	else if (filename.baseName=="dub.sdl")
	{
		package_=new Package(dir,PathAndFormat(Path(filename),PackageFormat.sdl));
		foreach(entry;package_.dependencies.keys)
			ret~=Dependency(filename,entry,package_.dependencies[entry].to!string);
		return ret;
	}
	else
		throw new Exception("cannot extractDepencies from "~filename~" - must be dub.json or dub.sdl");
}