cppcheck-diff.sh

#!/bin/bash
# Hook script for checking two files, running cppcheck
#  and looking for new cppcheck output
# Licence : GPLv3+, 2013

if [ $# -ne 2 ] ; then
    echo "usage: original.cpp altered.cpp"
    exit 1
fi

#Check for missing programs
#---
NEEDED_PROGRAMS="tre-agrep diff"
MISSING_PROG=0
for i in $NEEDED_PROGRAMS 
    do
        if [ x`which $i` == x""  ] ; then
        echo "Missing program : " $i
        MISSING_PROG=1
        fi
    done

if [ $MISSING_PROG -ne 0 ] ; then
    exit 1;
fi
#---

TMPDIR=/tmp

FILTER_LINE_FILE=$TMPDIR/cppcheck-ignore
    echo 'does not have a constructor
(information)
    is not initialized in the constructor
    C-style pointer casting
    [Aa]ssert
    convertion between' > $FILTER_LINE_FILE

    DIFFTMP=$TMPDIR/diff-tmp

    BASETMP=$TMPDIR/cppcheck-tmp

#run cppcheck on both files
    cppcheck -q --enable=style,performance,portability --inconclusive $1 2>&1| grep -v -f $FILTER_LINE_FILE > ${BASETMP}-a 
    cppcheck -q --enable=style,performance,portability --inconclusive $2 2>&1 | grep -v -f $FILTER_LINE_FILE > ${BASETMP}-b

#normalise names
    sed -i "s@$1@filename@" ${BASETMP}-a
    sed -i "s@$2@filename@" ${BASETMP}-b

#create backups
    cp $BASETMP-a $BASETMP-a.orig
    cp $BASETMP-b $BASETMP-b.orig

# Strip line numbers 
# Cppcheck can output multiple lline numbers, so cut them all
    sed  -i 's/:[0-9]*\]/:]/g' ${BASETMP}-a
    sed  -i 's/:[0-9]*\]/:]/g' ${BASETMP}-b

    diff -uh ${BASETMP}-a ${BASETMP}-b | egrep '^\+' | egrep -v '^\+\+' | sed 's/^+//' > $BASETMP-diff

#perform a near-string match, disallowing subsitution, or erase, 
# to  restore the file lines
#---
    SAVEIFS=$IFS
    IFS=`echo -en "\n\b"`
    rm -f $BASETMP-matches
    for i in `cat $BASETMP-diff`
        do
            tre-agrep  -k -7 -D 100 -S 100  "$i" $BASETMP-b.orig  >> $BASETMP-matches
        done
    IFS=$SAVEIFS
#---

    if [ -f $BASETMP-matches ]  ; then
        sed -i "s@filename@$1@" $BASETMP-matches
        cat $BASETMP-matches
    fi