refactor: parameterize the MISRA checking script (speeduino#507)

* refactor: parameterize the MISRA checking script

The script contained hardcoded paths, which made it difficult
to use as part of the development workflow.

* ci!: use script relative path to pick source folder

* ci!: default output folder within source tree

* refactor: have cppcheck run the misra script

* refactor: use "rm -f" - remove existence check

* refactor: encapsulate into functions

* ci!: merge git MISRA logic into check_misra.sh

* ci!: count true errors, not style violations

* ci: use common MISRA check script

Co-authored-by: adbancroft <[email protected]>

.gitignore

@@ -25,3 +25,4 @@ speeduino/board_samd21*
 reference/doxygen
 speeduino.ino.cpp
 test/output_export.cpp
+misra/.results

azure-pipelines.yml

@@ -25,8 +25,8 @@ steps:
   displayName: 'Making cppcheck'
 - bash: | 
     cd noisymime
-    chmod +x speeduino/misra/check_misra_github.sh
-    speeduino/misra/check_misra_github.sh
+    chmod +x speeduino/misra/check_misra.sh
+    speeduino/misra/check_misra.sh -c "cppcheck_github"
   #This task is always an error if there are MISRA violations
   continueOnError: true
   displayName: 'Running Scan'

misra/check_misra.sh

@@ -1,25 +1,78 @@
-if [ -f ./results.txt ]; then
-	rm results.txt
-fi
+#!/bin/bash
+
+script_folder="$(dirname $(readlink -f $0))"
+
+# Initialize variables with defaults
+source_folder="$script_folder/../speeduino" # -s, --source
+file_exts="ino"                             # -e, --exts
+out_folder="$script_folder/.results"        # -o, --out
+cppcheck_path=""                            # -c, --cppcheck
+
+function parse_command_line() {
+   while [ $# -gt 0 ] ; do
+    case "$1" in
+      -s | --source) source_folder="$2" ;;
+      -e | --exts) file_exts="$2" ;;
+      -o | --out) out_folder="$2" ;;
+      -c | --cppcheck) cppcheck_path="$2" ;;
+      -*) 
+        echo "Unknown option: " $1
+        exit 1
+        ;;
+    esac
+    shift
+  done
+}
+
+function run_cppcheck() {
+  shopt -s nullglob nocaseglob
+  for i in "$source_folder"/*.{"$file_exts",}; do
+    "$cppcheck_bin" \
+        --inline-suppr \
+        --language=c++ \
+        --addon="$script_folder/misra.json" \
+        --suppressions-list="$script_folder/suppressions.txt" \
+        -DCORE_AVR=1 \
+        -D__AVR_ATmega2560__ \
+        $i 2>> "$cpp_result_file"
+  done
+  shopt -u nullglob nocaseglob
+}
+
+function process_cpp_results() {
+  local intermediate_file="$out_folder/tmp.txt"
+
+  # It's grouped into chunks of 3 lines: fold those into one line
+  sed '$!N;$!N;s/\n/~/g' < "$cpp_result_file" |\
+    # Remove duplicate lines
+    sort | uniq > "$intermediate_file"
+  # Count error lines
+  local __error_count=`grep ": error:" < "$intermediate_file" | wc -l`
+  # Unfold the line groups for readability
+  tr '~' '\n' < "$intermediate_file" > "$result_file"
+  rm -f "$intermediate_file"
+
+  echo "$__error_count"
+}
+
+parse_command_line "$@"
 
-for i in speeduino/speeduino/*.ino; do
-  #cppcheck --xml --include=${i%.*}.h --include=speeduino/speeduino/globals.h $i > /dev/null
-  #cppcheck --force --dump --suppress=syntaxError:speeduino/speeduino/src/PID_v1/PID_v1.h --include=${i%.*}.h --include=speeduino/speeduino/globals.h -DCORE_AVR=1 -USTM32F4 $i > /dev/null
-  cppcheck --dump --suppress=syntaxError:speeduino/speeduino/src/PID_v1/PID_v1.h --include=${i%.*}.h -DCORE_AVR=1 -D__AVR_ATmega2560__ $i > /dev/null
-done
-mv speeduino/speeduino/*.dump ./
-rm ./utils.*.dump
+cppcheck_bin="${cppcheck_path}/cppcheck"
+cppcheck_misra="${cppcheck_path}/addons/misra.py"
+cpp_result_file="$out_folder/cpp_results.txt"
+result_file="$out_folder/results.txt"
 
-python cppcheck/addons/misra.py --rule-texts=speeduino/misra/misra_2012_text.txt *.dump 2> results.txt
-rm *.dump
+mkdir -p "$out_folder"
+rm -f "$cpp_result_file"
+rm -f "$result_file"
 
-cat results.txt
-# wc -l results.txt
+run_cppcheck
+error_count="$(process_cpp_results)"
 
-errors=`wc -l < results.txt | tr -d ' '`
-echo $errors MISRA violations
+cat "$result_file"
+echo $error_count MISRA violations
 
-if [ $errors -gt 0 ]; then
+if [ $error_count -gt 0 ]; then
 	exit 1
 else
 	exit 0

misra/misra.json

@@ -0,0 +1 @@
+{"script": "misra.py","args": ["--rule-texts=./misra_2012_text.txt"]}