tools/bzl/asciidoc.bzl

def documentation_attributes():
    return [
        "toc2",
        'newline="\\n"',
        'asterisk="*"',
        'plus="+"',
        'caret="^"',
        'startsb="["',
        'endsb="]"',
        'tilde="~"',
        "last-update-label!",
        "source-highlighter=prettify",
        "stylesheet=DEFAULT",
        "linkcss=true",
        "prettifydir=.",
        # Just a placeholder, will be filled in asciidoctor java binary:
        "revnumber=%s",
    ]

def _replace_macros_impl(ctx):
    cmd = [
        ctx.file._exe.path,
        "--suffix",
        ctx.attr.suffix,
        "-s",
        ctx.file.src.path,
        "-o",
        ctx.outputs.out.path,
    ]
    if ctx.attr.searchbox:
        cmd.append("--searchbox")
    else:
        cmd.append("--no-searchbox")
    ctx.actions.run_shell(
        inputs = [ctx.file._exe, ctx.file.src],
        outputs = [ctx.outputs.out],
        command = cmd,
        use_default_shell_env = True,
        progress_message = "Replacing macros in %s" % ctx.file.src.short_path,
    )

_replace_macros = rule(
    attrs = {
        "src": attr.label(
            mandatory = True,
            allow_single_file = [".txt"],
        ),
        "out": attr.output(mandatory = True),
        "searchbox": attr.bool(default = True),
        "suffix": attr.string(mandatory = True),
        "_exe": attr.label(
            default = Label("//Documentation:replace_macros.py"),
            allow_single_file = True,
        ),
    },
    implementation = _replace_macros_impl,
)

def _generate_asciidoc_args(ctx):
    args = []
    if ctx.attr.backend:
        args.extend(["-b", ctx.attr.backend])
    revnumber = False
    for attribute in ctx.attr.attributes:
        if attribute.startswith("revnumber="):
            revnumber = True
        else:
            args.extend(["-a", attribute])
    if revnumber:
        args.extend([
            "--revnumber-file",
            ctx.file.version.path,
        ])
    for src in ctx.files.srcs:
        args.append(src.path)
    return args

def _invoke_replace_macros(name, src, suffix, searchbox):
    fn = src
    if fn.startswith(":"):
        fn = src[1:]

    _replace_macros(
        name = "macros_%s_%s" % (name, fn),
        src = src,
        out = fn + suffix,
        suffix = suffix,
        searchbox = searchbox,
    )

    return ":" + fn + suffix, fn.replace(".txt", ".html")

def _asciidoc_impl(ctx):
    args = [
        "--bazel",
        "--in-ext",
        ".txt" + ctx.attr.suffix,
        "--out-ext",
        ".html",
    ]
    args.extend(_generate_asciidoc_args(ctx))
    ctx.actions.run(
        inputs = ctx.files.srcs + [ctx.file.version],
        outputs = ctx.outputs.outs,
        tools = [ctx.executable._exe],
        executable = ctx.executable._exe,
        arguments = args,
        progress_message = "Rendering asciidoctor files for %s" % ctx.label.name,
    )

_asciidoc_attrs = {
    "srcs": attr.label_list(
        mandatory = True,
        allow_files = True,
    ),
    "attributes": attr.string_list(),
    "backend": attr.string(),
    "suffix": attr.string(mandatory = True),
    "version": attr.label(
        default = Label("//:version.txt"),
        allow_single_file = True,
    ),
    "_exe": attr.label(
        default = Label("//java/com/google/gerrit/asciidoctor:asciidoc"),
        cfg = "host",
        allow_files = True,
        executable = True,
    ),
}

_asciidoc = rule(
    attrs = dict(_asciidoc_attrs.items() + {
        "outs": attr.output_list(mandatory = True),
    }.items()),
    implementation = _asciidoc_impl,
)

def _genasciidoc_htmlonly(
        name,
        srcs = [],
        attributes = [],
        backend = None,
        searchbox = True,
        **kwargs):
    SUFFIX = "." + name + "_macros"
    new_srcs = []
    outs = ["asciidoctor.css"]

    for src in srcs:
        new_src, html_name = _invoke_replace_macros(name, src, SUFFIX, searchbox)
        new_srcs.append(new_src)
        outs.append(html_name)

    _asciidoc(
        name = name + "_gen",
        srcs = new_srcs,
        suffix = SUFFIX,
        backend = backend,
        attributes = attributes,
        outs = outs,
    )

    native.filegroup(
        name = name,
        data = outs,
        **kwargs
    )

def genasciidoc(
        name,
        srcs = [],
        attributes = [],
        backend = None,
        searchbox = True,
        resources = True,
        **kwargs):
    SUFFIX = "_htmlonly"

    _genasciidoc_htmlonly(
        name = name + SUFFIX if resources else name,
        srcs = srcs,
        attributes = attributes,
        backend = backend,
        searchbox = searchbox,
        **kwargs
    )

    if resources:
        htmlonly = ":" + name + SUFFIX
        native.filegroup(
            name = name,
            srcs = [
                htmlonly,
                "//Documentation:resources",
            ],
            **kwargs
        )

def _asciidoc_html_zip_impl(ctx):
    args = [
        "--mktmp",
        "-z",
        ctx.outputs.out.path,
        "--in-ext",
        ".txt" + ctx.attr.suffix,
        "--out-ext",
        ".html",
    ]
    args.extend(_generate_asciidoc_args(ctx))
    ctx.actions.run(
        inputs = ctx.files.srcs + [ctx.file.version],
        outputs = [ctx.outputs.out],
        tools = [ctx.executable._exe],
        executable = ctx.executable._exe,
        arguments = args,
        progress_message = "Rendering asciidoctor files for %s" % ctx.label.name,
    )

_asciidoc_html_zip = rule(
    attrs = _asciidoc_attrs,
    outputs = {
        "out": "%{name}.zip",
    },
    implementation = _asciidoc_html_zip_impl,
)

def _genasciidoc_htmlonly_zip(
        name,
        srcs = [],
        attributes = [],
        backend = None,
        searchbox = True,
        **kwargs):
    SUFFIX = "." + name + "_expn"
    new_srcs = []

    for src in srcs:
        new_src, _ = _invoke_replace_macros(name, src, SUFFIX, searchbox)
        new_srcs.append(new_src)

    _asciidoc_html_zip(
        name = name,
        srcs = new_srcs,
        suffix = SUFFIX,
        backend = backend,
        attributes = attributes,
    )

def _asciidoc_zip_impl(ctx):
    tmpdir = ctx.outputs.out.path + "_tmpdir"
    cmd = [
        "p=$PWD",
        "rm -rf %s" % tmpdir,
        "mkdir -p %s/%s/" % (tmpdir, ctx.attr.directory),
        "unzip -q %s -d %s/%s/" % (ctx.file.src.path, tmpdir, ctx.attr.directory),
    ]
    for r in ctx.files.resources:
        if r.path == r.short_path:
            cmd.append("tar -cf- %s | tar -C %s -xf-" % (r.short_path, tmpdir))
        else:
            parent = r.path[:-len(r.short_path)]
            cmd.append(
                "tar -C %s -cf- %s | tar -C %s -xf-" % (parent, r.short_path, tmpdir),
            )
    cmd.extend([
        "cd %s" % tmpdir,
        "zip -qr $p/%s *" % ctx.outputs.out.path,
    ])
    ctx.actions.run_shell(
        inputs = [ctx.file.src] + ctx.files.resources,
        outputs = [ctx.outputs.out],
        command = " && ".join(cmd),
        progress_message =
            "Generating asciidoctor zip file %s" % ctx.outputs.out.short_path,
    )

_asciidoc_zip = rule(
    attrs = {
        "src": attr.label(
            mandatory = True,
            allow_single_file = [".zip"],
        ),
        "directory": attr.string(mandatory = True),
        "resources": attr.label_list(
            mandatory = True,
            allow_files = True,
        ),
    },
    outputs = {
        "out": "%{name}.zip",
    },
    implementation = _asciidoc_zip_impl,
)

def genasciidoc_zip(
        name,
        srcs = [],
        attributes = [],
        directory = None,
        backend = None,
        searchbox = True,
        resources = True,
        **kwargs):
    SUFFIX = "_htmlonly"

    _genasciidoc_htmlonly_zip(
        name = name + SUFFIX if resources else name,
        srcs = srcs,
        attributes = attributes,
        backend = backend,
        searchbox = searchbox,
        **kwargs
    )

    if resources:
        htmlonly = ":" + name + SUFFIX
        _asciidoc_zip(
            name = name,
            src = htmlonly,
            resources = ["//Documentation:resources"],
            directory = directory,
        )