#!/bin/bash

fileExt="*.js"

allFiles=$(find ./ -name "$fileExt")

commentLines=$((perl -ne 'print "$1n" while /(^s+//s*w+)/sg' $allFiles;
perl -0777 -ne 'print "$1n" while /(**.*?*/)/sg' $allFiles) | wc -l)

blankLines=$(grep '^[[:space:]]*//' -r --include $fileExt | wc -l)

allLines=$(echo $allFiles | xargs wc -l | tail -n 1 | cut -d " " -f 2)

echo -e "nTotal comments line is: $commentLines.n
Total blank lines is: $blankLines.n
nTotal all lines is: $allLines."

allFiles=$(find ./ -name "$fileExt")

commentLines=$((perl -ne 'print "$1n" while /(^s+//s*w+)/sg' $allFiles;
perl -0777 -ne 'print "$1n" while /(**.*?*/)/sg' $allFiles) | wc -l)

//this is a comment line

function foo(params 1) { // return void

}

/(^s+//s*w+)/sg

/**
 * return something
 * @param {object} obj
 * return void
*/

perl -0777 -ne 'print "$1n" while /(**.*?*/)/sg' $allFiles

grep '^[[:space:]]*//' -r --include $fileExt | wc -l

echo $allFiles | xargs wc -l | tail -n 1 | cut -d " " -f 2

$ touch a.js b.js
$ fileExt="*.js"
$ find ./ -name $fileExt
find: paths must precede expression: `b.js'
find: possible unquoted pattern after predicate `-name'?

dirs=("${@:-.}")

allFiles=$(find "${dirs[@]}" -name "$fileExt" -type f)

allFiles=()
while IFS=  read -r -d ''; do
    allFiles+=("$REPLY")
done < <(find ./ -name "$fileExt" -type f -print0)

sed -e '!^[[:blank:]]*/**!,!*/!s/.*/\\/'
    -e '|^[[:blank:]]*//|!d'

cat <<EOF
Total comments lines is: $commentLines.
Total blank lines is: $blankLines.
Total all lines is: $allLines.
EOF
exit

#!/bin/bash
set -eu

fileExt='*.js'
dirs=("${@:-/usr/lib/nodejs/lodash}")

allFiles=()
while IFS=  read -r -d ''; do
    allFiles+=("$REPLY")
done < <(find "${dirs[@]}" -name "$fileExt" -type f -print0)

commentLines=$(sed -e '!^[[:blank:]]*/**!,!*/!s/.*/\\/'
                   -e '|^[[:blank:]]*//|!d'
                   "${allFiles[@]}" | wc -l)
blankLines=$(cat "${allFiles[@]}" | grep -c '^[[:blank:]]*$')
allLines=$(cat "${allFiles[@]}" | wc -l)

cat <<EOF
Total comment lines is: $commentLines.
Total blank lines is: $blankLines.
Total all lines is: $allLines.
EOF