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|
"""Wrappers for website documentation."""
load("//tools:defs.bzl", "short_path")
# DocInfo is a provider which simple adds sufficient metadata to the source
# files (and additional data files) so that a jeyll header can be constructed
# dynamically. This is done the via BUILD system so that the plain
# documentation files can be viewable without non-compliant markdown headers.
DocInfo = provider(
fields = [
"layout",
"description",
"permalink",
"category",
"subcategory",
"weight",
"editpath",
"authors",
],
)
def _doc_impl(ctx):
return [
DefaultInfo(
files = depset(ctx.files.src + ctx.files.data),
),
DocInfo(
layout = ctx.attr.layout,
description = ctx.attr.description,
permalink = ctx.attr.permalink,
category = ctx.attr.category,
subcategory = ctx.attr.subcategory,
weight = ctx.attr.weight,
editpath = short_path(ctx.files.src[0].short_path),
authors = ctx.attr.authors,
),
]
doc = rule(
implementation = _doc_impl,
doc = "Annotate a document for jekyll headers.",
attrs = {
"src": attr.label(
doc = "The markdown source file.",
mandatory = True,
allow_single_file = True,
),
"data": attr.label_list(
doc = "Additional data files (e.g. images).",
allow_files = True,
),
"layout": attr.string(
doc = "The document layout.",
default = "docs",
),
"description": attr.string(
doc = "The document description.",
default = "",
),
"permalink": attr.string(
doc = "The document permalink.",
mandatory = True,
),
"category": attr.string(
doc = "The document category.",
default = "",
),
"subcategory": attr.string(
doc = "The document subcategory.",
default = "",
),
"weight": attr.string(
doc = "The document weight.",
default = "50",
),
"authors": attr.string_list(),
},
)
def _docs_impl(ctx):
# Tarball is the actual output.
tarball = ctx.actions.declare_file(ctx.label.name + ".tgz")
# But we need an intermediate builder to translate the files.
builder = ctx.actions.declare_file("%s-builder" % ctx.label.name)
builder_content = [
"#!/bin/bash",
"set -euo pipefail",
"declare -r T=$(mktemp -d)",
"function cleanup {",
" rm -rf $T",
"}",
"trap cleanup EXIT",
]
for dep in ctx.attr.deps:
doc = dep[DocInfo]
# Sanity check the permalink.
if not doc.permalink.endswith("/"):
fail("permalink %s for target %s should end with /" % (
doc.permalink,
ctx.label.name,
))
# Construct the header.
header = """\
description: {description}
permalink: {permalink}
category: {category}
subcategory: {subcategory}
weight: {weight}
editpath: {editpath}
authors: {authors}
layout: {layout}"""
for f in dep.files.to_list():
# Is this a markdown file? If not, then we ensure that it ends up
# in the same path as the permalink for relative addressing.
if not f.basename.endswith(".md"):
builder_content.append("mkdir -p $T/%s" % doc.permalink)
builder_content.append("cp %s $T/%s" % (f.path, doc.permalink))
continue
# Is this a post? If yes, then we must put this in the _posts
# directory. This directory is treated specially with respect to
# pagination and page generation.
dest = f.short_path
if doc.layout == "post":
dest = "_posts/" + f.basename
builder_content.append("echo Processing %s... >&2" % f.short_path)
builder_content.append("mkdir -p $T/$(dirname %s)" % dest)
# Construct the header dynamically. We include the title field from
# the markdown itself, as this is the g3doc format required. The
# title will be injected by the web layout however, so we don't
# want this to appear in the document.
args = dict([(k, getattr(doc, k)) for k in dir(doc)])
builder_content.append("title=\"$(grep -E '^# ' %s | head -n 1 | cut -d'#' -f2- || true)\"" % f.path)
builder_content.append("cat >$T/%s <<EOF" % dest)
builder_content.append("---")
builder_content.append("title: $title")
builder_content.append(header.format(**args))
builder_content.append("---")
builder_content.append("EOF")
# To generate the final page, we need to strip out the title (which
# was pulled above to generate the annotation in the frontmatter,
# and substitute the [TOC] tag with the {% toc %} plugin tag. Note
# that the pipeline here is almost important, as the grep will
# return non-zero if the file is empty, but we ignore that within
# the pipeline.
builder_content.append("grep -v -E '^# ' %s | sed -e 's|^\\[TOC\\]$|- TOC\\n{:toc}|' >>$T/%s" %
(f.path, dest))
builder_content.append("declare -r filename=$(readlink -m %s)" % tarball.path)
builder_content.append("(cd $T && tar -zcf \"${filename}\" .)\n")
ctx.actions.write(builder, "\n".join(builder_content), is_executable = True)
# Generate the tarball.
ctx.actions.run(
inputs = depset(ctx.files.deps),
outputs = [tarball],
progress_message = "Generating %s" % ctx.label,
executable = builder,
)
return [DefaultInfo(
files = depset([tarball]),
)]
docs = rule(
implementation = _docs_impl,
doc = "Construct a site tarball from doc dependencies.",
attrs = {
"deps": attr.label_list(
doc = "All document dependencies.",
),
},
)
|
