devtools: add checkpatch spelling dictionary builder

The script checkpatch.pl (used in checkpatches.sh) can use a dictionary
from the codespell project to check spelling.
There are multiple dictionaries to be used.

The script build-dict.sh concatenate multiple dictionaries and remove
some annoying false positives.

The dictionary built by this script must be saved in a file which
is referenced with the environment variable DPDK_CHECKPATCH_CODESPELL.
The easiest is to export this variable in ~/.config/dpdk/devel.config.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

MAINTAINERS

@@ -85,6 +85,7 @@ F: doc/
 Developers and Maintainers Tools
 M: Thomas Monjalon <thomas@monjalon.net>
 F: MAINTAINERS
+F: devtools/build-dict.sh
 F: devtools/check-dup-includes.sh
 F: devtools/check-maintainers.sh
 F: devtools/check-forbidden-tokens.awk

devtools/build-dict.sh

@@ -0,0 +1,22 @@
+#! /bin/sh -e
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2020 Mellanox Technologies, Ltd
+
+# Build a spelling dictionary suitable for DPDK_CHECKPATCH_CODESPELL
+
+# path to local clone of https://github.com/codespell-project/codespell.git
+codespell_path=$1
+
+# concatenate codespell dictionaries, except GB/US one
+for suffix in .txt _code.txt _informal.txt _names.txt _rare.txt _usage.txt ; do
+	cat $codespell_path/codespell_lib/data/dictionary$suffix
+done |
+
+# remove too short or wrong checks
+sed '/^..->/d' |
+sed '/^uint->/d' |
+sed "/^doesn'->/d" |
+sed '/^wasn->/d' |
+
+# print to stdout
+cat