[dpdk-dev] [PATCH 5/6] doc/guides: rebuild with meson whenever a file changes

[Bruce Richardson <bruce.richardson@intel.com>]

Add proper support for calling sphinx whenever a file in the doc
directory changes. This is accomplished by using a wrapper script
for sphinx, which runs sphinx but also emits a gcc-format dependency
file listing all the doc files. This is used by ninja so that any
change to the doc files triggers a rebuild of the docs.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 buildtools/call-sphinx-build.py | 29 +++++++++++++++++++++++++++++
 buildtools/meson.build          |  6 ++++--
 doc/guides/meson.build          | 22 ++++++++--------------
 3 files changed, 41 insertions(+), 16 deletions(-)
 create mode 100755 buildtools/call-sphinx-build.py

diff --git a/buildtools/call-sphinx-build.py b/buildtools/call-sphinx-build.py
new file mode 100755
index 000000000..027317b9b
--- /dev/null
+++ b/buildtools/call-sphinx-build.py
@@ -0,0 +1,29 @@
+#! /usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2019 Intel Corporation
+#
+
+import sys
+import os
+import os.path
+import subprocess
+
+sphinx = sys.argv[1]
+src = sys.argv[2]
+dst = sys.argv[3]
+depfile = os.path.join(dst,'.html.d')
+
+# find all the files sphinx will process so we can write them as dependencies
+srcfiles = []
+for root, dirs, files in os.walk(src):
+    for f in files:
+        srcfiles.append(os.path.join(root, f))
+
+# run sphinx, putting the html output in a "html" directory
+subprocess.run([sphinx, '-j', 'auto', '-b', 'html', src,
+                os.path.join(dst, 'html')], check = True)
+
+# create a gcc format .d file giving all the dependencies of this doc build
+with open(depfile, 'w') as d:
+    d.write('html: ' + ' '.join(srcfiles) + '\n')
+subprocess.run(['cp', '-f', depfile, '/tmp'])
diff --git a/buildtools/meson.build b/buildtools/meson.build
index 6ef2c5721..cd1d05403 100644
--- a/buildtools/meson.build
+++ b/buildtools/meson.build
@@ -10,10 +10,12 @@ check_experimental_syms = find_program('check-experimental-syms.sh')
 # set up map-to-def script using python, either built-in or external
 python3 = import('python').find_installation(required: false)
 if python3.found()
-	map_to_def_cmd = [python3, files('map_to_def.py')]
+	py3 = [python3]
 else
-	map_to_def_cmd = ['meson', 'runpython', files('map_to_def.py')]
+	py3 = ['meson', 'runpython']
 endif
+map_to_def_cmd = py3 + files('map_to_def.py')
+sphinx_wrapper = py3 + files('call-sphinx-build.py')
 
 # stable ABI always starts with "DPDK_"
 is_experimental_cmd = [find_program('grep', 'findstr'), '^DPDK_']
diff --git a/doc/guides/meson.build b/doc/guides/meson.build
index 80c21d168..732e7ad3a 100644
--- a/doc/guides/meson.build
+++ b/doc/guides/meson.build
@@ -7,24 +7,18 @@ if not sphinx.found()
 	subdir_done()
 endif
 
-htmldir = join_paths('share', 'doc', 'dpdk')
+htmldir = join_paths(get_option('datadir'), 'doc', 'dpdk')
 html_guides = custom_target('html_guides',
-	input: meson.current_source_dir(),
-	output: 'guides',
-	command: [sphinx, '-b', 'html',
-		'-d', meson.current_build_dir() + '/.doctrees',
-		'@INPUT@', meson.current_build_dir() + '/guides'],
+	input: files('index.rst'),
+	output: 'html',
+	command: [sphinx_wrapper, sphinx, meson.current_source_dir(), meson.current_build_dir()],
+	depfile: '.html.d',
 	build_by_default: get_option('enable_docs'),
 	install: get_option('enable_docs'),
 	install_dir: htmldir)
 
+install_data(files('custom.css'),
+			install_dir: join_paths(htmldir,'_static', 'css'))
+
 doc_targets += html_guides
 doc_target_names += 'HTML_Guides'
-
-# sphinx leaves a .buildinfo in the target directory, which we don't
-# want to install. Note that sh -c has to be used, otherwise the
-# env var does not get expanded if calling rm/install directly.
-meson.add_install_script('sh', '-c',
-	'rm -f $MESON_INSTALL_DESTDIR_PREFIX/share/doc/dpdk/guides/.buildinfo')
-meson.add_install_script('sh', '-c',
-	'install -D -m0644 $MESON_SOURCE_ROOT/doc/guides/custom.css $MESON_INSTALL_DESTDIR_PREFIX/share/doc/dpdk/guides/_static/css/custom.css')
-- 
2.24.1