qt.bzl

def qt_ui_library(name, ui, deps, **kwargs):
    """Compiles a QT UI file and makes a library for it.

    Args:
      name: A name for the rule.
      src: The ui file to compile.
      deps: cc_library dependencies for the library.
    """
    native.genrule(
        name = "%s_uic" % name,
        srcs = [ui],
        outs = ["ui_%s.h" % ui.split(".")[0]],
        cmd = "uic $(locations %s) -o $@" % ui,
    )

    native.cc_library(
        name = name,
        hdrs = [":%s_uic" % name],
        deps = deps,
        **kwargs
    )

def qt_resource(name, qrc_file, deps, **kwargs):
    """Turns a .qrc file into a cc_library.

    Args:
      name: A name for the rule.
      qrc_file: The .qrc file to process
      deps: Any files listed in the .qrc must be listed here because bazel doesn't allow reading files at analysis time.
    """
    outfile = name + "_gen.cpp"
    native.genrule(
        name = name + "_gen",
        srcs = [qrc_file] + deps,
        outs = [outfile],
        cmd = "rcc --name $(OUTS) --output $(OUTS) $(location %s)" % qrc_file,
    )

    native.cc_library(
        name = name,
        srcs = [outfile],
        alwayslink = 1,
        **kwargs
    )

def qt_cc_library(name, src, hdr, normal_hdrs = [], deps = None, **kwargs):
    """Compiles a QT library and generates the MOC for it.

    If a UI file is provided, then it is also compiled with UIC.

    Args:
      name: A name for the rule.
      src: The cpp file to compile.
      hdr: The single header file that the MOC compiles to src.
      normal_hdrs: Headers which are not sources for generated code.
      deps: cc_library dependencies for the library.
      ui: If provided, a UI file to compile with UIC.
      ui_deps: Dependencies for the UI file.
      kwargs: Any additional arguments are passed to the cc_library rule.
    """
    header_path = "%s/%s" % (PACKAGE_NAME, hdr) if len(PACKAGE_NAME) > 0 else hdr
    native.genrule(
        name = "%s_moc" % name,
        srcs = [hdr],
        outs = ["moc_%s.cpp" % name],
        cmd = "moc $(location %s) -o $@ -f'%s'" %
              (hdr, header_path),
    )
    srcs = [src, ":%s_moc" % name]

    hdrs = [hdr] + normal_hdrs

    native.cc_library(
        name = name,
        srcs = srcs,
        hdrs = hdrs,
        deps = deps,
        **kwargs
    )