scripts: highlight bad patterns in commit check

I got a report like following:

    Wrong headline lowercase:
            xxx: move vhost device ctx to cuse

It takes a bit while (by checking the code) that it's "ctx" triggers
the warning. It could be spotted very quickly if "tx" is highlighted.
This patch adds such support.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/scripts/check-git-log.sh b/scripts/check-git-log.sh
index b7ea1be..153f378 100755 (executable)
--- a/scripts/check-git-log.sh
+++ b/scripts/check-git-log.sh
@@ -55,7 +55,7 @@ tags=$(git log --format='%b' $range | grep -i -e 'by *:' -e 'fix.*:')
 fixes=$(git log --format='%h %s' $range | grep -i ': *fix' | cut -d' ' -f1)
 
 # check headline format (spacing, no punctuation, no code)
-bad=$(echo "$headlines" | grep \
+bad=$(echo "$headlines" | grep --color=always \
        -e '    ' \
        -e '^ ' \
        -e ' $' \
@@ -69,7 +69,7 @@ bad=$(echo "$headlines" | grep \
 [ -z "$bad" ] || printf "Wrong headline format:\n$bad\n"
 
 # check headline label for common typos
-bad=$(echo "$headlines" | grep \
+bad=$(echo "$headlines" | grep --color=always \
        -e '^example[:/]' \
        -e '^apps/' \
        -e '^testpmd' \
@@ -79,14 +79,14 @@ bad=$(echo "$headlines" | grep \
 [ -z "$bad" ] || printf "Wrong headline label:\n$bad\n"
 
 # check headline lowercase for first words
-bad=$(echo "$headlines" | grep \
+bad=$(echo "$headlines" | grep --color=always \
        -e '^.*[A-Z].*:' \
        -e ': *[A-Z]' \
        | sed 's,^,\t,')
 [ -z "$bad" ] || printf "Wrong headline uppercase:\n$bad\n"
 
 # check headline uppercase (Rx/Tx, VF, L2, MAC, Linux, ARM...)
-bad=$(echo "$headlines" | grep -E \
+bad=$(echo "$headlines" | grep -E --color=always \
        -e '\<(rx|tx|RX|TX)\>' \
        -e '\<[pv]f\>' \
        -e '\<l[234]\>' \