[3/3] doc: rewrite shell scripts in Python

diff --git a/doc/api/generate_doxygen.py b/doc/api/generate_doxygen.py
new file mode 100644
index 0000000000..2ccedf844e
--- /dev/null
+++ b/doc/api/generate_doxygen.py
@@ -0,0 +1,19 @@ 
+#!/usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# (c) 2018 Luca Boccassi <bluca@debian.org>
+# (c) 2022 Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
+
+import os, re, subprocess, sys
+
+pattern = re.compile('^Preprocessing (.*)...$')
+out_dir, *doxygen_command = sys.argv[1:]
+out_file = os.path.join(os.path.dirname(out_dir), 'doxygen.out')
+dep_file = f'{out_dir}.d'
+with open(out_file, 'w') as out:
+    subprocess.run(doxygen_command, check=True, stdout=out)
+with open(out_file) as out, open(dep_file, 'w') as dep:
+    print(f'{out_dir}:', end=' ', file=dep)
+    for line in out:
+        match = re.match(pattern, line)
+        if match:
+            print(match.group(1), end=' ', file=dep)
diff --git a/doc/api/generate_doxygen.sh b/doc/api/generate_doxygen.sh
deleted file mode 100755
index 1940ea46e2..0000000000
--- a/doc/api/generate_doxygen.sh
+++ /dev/null
@@ -1,12 +0,0 @@ 
-#! /bin/sh -e
-# SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2018 Luca Boccassi <bluca@debian.org>
-
-DOXYCONF=$1
-OUTDIR=$2
-
-OUT_FILE=$(dirname $OUTDIR)/doxygen.out
-
-# run doxygen, capturing all the header files it processed
-doxygen "${DOXYCONF}" > $OUT_FILE
-echo "$OUTDIR: $(awk '/Preprocessing/ {printf("%s ", substr($2, 1, length($2) - 3))}' $OUT_FILE)" > $OUTDIR.d
diff --git a/doc/api/generate_examples.py b/doc/api/generate_examples.py
new file mode 100644
index 0000000000..66933f9472
--- /dev/null
+++ b/doc/api/generate_examples.py
@@ -0,0 +1,31 @@ 
+#!/usr/bin/env python3
+# SPDX-License-Identifier: BSD-3-Clause
+# (c) 2018 Luca Boccassi <bluca@debian.org>
+# (c) 2022 Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
+
+import os, sys
+
+examples_dir, api_examples = sys.argv[1:]
+
+sources = []
+with open(f'{api_examples}.d', 'w') as dep:
+    print(f'{api_examples}:', end=' ', file=dep)
+    for root, _, files in os.walk(examples_dir):
+        for name in files:
+            is_source = name.endswith('.c')
+            if is_source or name == 'meson.meson.build':
+                path = os.path.join(root, name)
+                if is_source:
+                    sources.append(path)
+                print(path , end=' ', file=dep)
+
+sys.stdout = open(api_examples, 'w')
+print('/**')
+print('@page examples DPDK Example Programs')
+print()
+for path in sources:
+    # Produce consistent output with forward slashes on all systems.
+    # Every \ in paths within examples directory is a separator, not escape.
+    relpath = os.path.relpath(path, examples_dir).replace('\\', '/')
+    print(f'@example examples/{relpath}')
+print('*/')
diff --git a/doc/api/generate_examples.sh b/doc/api/generate_examples.sh
deleted file mode 100755
index 48574563ca..0000000000
--- a/doc/api/generate_examples.sh
+++ /dev/null
@@ -1,20 +0,0 @@ 
-#! /bin/sh -e
-# SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2018 Luca Boccassi <bluca@debian.org>
-
-EXAMPLES_DIR=$1
-API_EXAMPLES=$2
-
-FIND=find
-
-# generate a .d file including both C files and also build files, so we can
-# detect both file changes and file additions/deletions
-echo "$API_EXAMPLES: $($FIND ${EXAMPLES_DIR} -type f \( -name '*.c' -o -name 'meson.build' \) | tr '\n' ' ' )" > ${API_EXAMPLES}.d
-
-exec > "${API_EXAMPLES}"
-printf '/**\n'
-printf '@page examples DPDK Example Programs\n\n'
-$FIND "${EXAMPLES_DIR}" -type f -name '*.c' |
-	sed "s|${EXAMPLES_DIR}|@example examples|" |
-	LC_ALL=C sort
-printf '*/\n'
diff --git a/doc/api/meson.build b/doc/api/meson.build
index 53338a02d6..2876a78a7e 100644
--- a/doc/api/meson.build
+++ b/doc/api/meson.build
@@ -11,8 +11,8 @@  endif
 # is in a subdirectory that is created at build time and thus it cannot
 # be an individual custom_target, we need to wrap the doxygen call in a
 # script to run the CSS modification afterwards
-generate_doxygen = find_program('generate_doxygen.sh')
-generate_examples = find_program('generate_examples.sh')
+generate_doxygen = py3 + files('generate_doxygen.py')
+generate_examples = py3 + files('generate_examples.py')
 
 htmldir = join_paths(get_option('datadir'), 'doc', 'dpdk')
 
@@ -51,7 +51,7 @@  doxy_build = custom_target('doxygen',
         input: doxy_conf,
         output: 'html',
         depfile: 'html.d',
-        command: [generate_doxygen, '@INPUT@', '@OUTPUT@'],
+        command: [generate_doxygen, '@OUTPUT@', doxygen, '@INPUT@'],
         install: get_option('enable_docs'),
         install_dir: htmldir,
         build_by_default: get_option('enable_docs'))