doc: Add documentation-generating scripts to the Crashpad tree

doc/generate_asciidoc.sh

+#!/bin/bash
+
+# Copyright 2015 The Crashpad Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+# Generating AsciiDoc documentation requires AsciiDoc,
+# http://www.methods.co.nz/asciidoc/. For “man” and PDF output, a DocBook
+# toolchain including docbook-xml and docbook-xsl is also required.
+
+# Run from the Crashpad project root directory.
+cd "$(dirname "${0}")/.."
+
+output_dir=out/doc/man
+
+rm -rf "${output_dir}"
+mkdir -p \
+    "${output_dir}/html" \
+    "${output_dir}/man"
+
+# Some extensions of command-line tools behave differently on different systems.
+# $sed_ext should be a sed invocation that enables extended regular expressions.
+# $date_time_t should be a date invocation that causes it to print the date and
+# time corresponding to a time_t string that immediately follows it.
+uname_s="$(uname -s)"
+case "${uname_s}" in
+  Darwin)
+    sed_ext="sed -E"
+    date_time_t="date -r"
+    ;;
+  Linux)
+    sed_ext="sed -r"
+    date_time_t="date -d@"
+    ;;
+  *)
+    echo "${0}: unknown operating system" >& 2
+    exit 1
+    ;;
+esac
+
+# Get the version from package.h.
+version=$(${sed_ext} -n -e 's/^#define PACKAGE_VERSION "(.*)"$/\1/p' package.h)
+
+for input in \
+    handler/mac/crashpad_handler.ad \
+    tools/*.ad \
+    tools/mac/*.ad; do
+  echo "${input}"
+
+  base=$(${sed_ext} -e 's%^.*/([^/]+)\.ad$%\1%' <<< "${input}")
+
+  # Get the last-modified date of $input according to Git, in UTC.
+  git_time_t="$(git log -1 --format=%at "${input}")"
+  git_date="$(LC_ALL=C ${date_time_t}"${git_time_t}" -u '+%B %-d, %Y')"
+
+  # Create HTML output.
+  asciidoc \
+      --attribute mansource=Crashpad \
+      --attribute manversion="${version}" \
+      --attribute manmanual="Crashpad Manual" \
+      --attribute revdate="${git_date}" \
+      --conf-file doc/asciidoc.conf \
+      --doctype manpage \
+      --backend html5 \
+      --attribute stylesheet="${PWD}/doc/asciidoc.css" \
+      --out-file "${output_dir}/html/${base}.html" \
+      "${input}"
+
+  # Create “man” output.
+  #
+  # AsciiDoc 8.6.9 produces harmless incorrect warnings each time this is run:
+  # “a2x: WARNING: --destination-dir option is only applicable to HTML based
+  # outputs”. https://github.com/asciidoc/asciidoc/issues/44
+  a2x \
+      --attribute mansource=Crashpad \
+      --attribute manversion="${version}" \
+      --attribute manmanual="Crashpad Manual" \
+      --attribute revdate="${git_date}" \
+      --doctype manpage \
+      --format manpage \
+      --destination-dir "${output_dir}/man" \
+      "${input}"
+
+  # For PDF output, use an a2x command like the one above, with these options:
+  # --format pdf --fop --destination-dir "${output_dir}/pdf"
+done