Bash script that does high level analysis of Python, Java, and Scala source files

overview

#! /bin/bash
#
# overview -- searches through all Java, Python, and Scala files in the current
#             directory and all subdirectories and lists some basic stats about
#             each file

if [ "$1" == "--help" ]
then
        cat <<-HERE >&2
usage: overview [--help]
   \\n  - number of lines
   Dep - number of dependencies (e.g. imports)
   Cls - number of classes
   Lp  - number of loops
   If  - number of ifs
   Els - number of elses
   Try - number of try blocks
   Exc - number of exceptions thrown
   New - number of new statements
   //  - number of comments
   [ ] - todo
HERE
        exit
fi

echo "  \\n Dep Cls  Lp  If Els Try Exc New  // [ ]" >&2

for fn in $(find . \( -iname '*.java' -o -iname '*.scala' -o -name '*.py' \))
do
    if [ -r $fn ]
    then
        gawk -v file_name=$fn '

            # Lines with something on them

            ! /^[ ]+$/ {
                    lines++
            }

            # comments that suggest more work to be done

            tolower($_) ~ /\ytodo\y|\ytodo\y|\ykludge\y/ {
                    todos++
            }

            # Java/Scala single line comment

            /^[ \t]*\/\// {
                comments++
                next
            }

            # Java/Scala start multi-line comment

            /^[ \t]*\/\*/ {
                comments++
                next
            }

            # Java/Scala end multi-line comment

            /^[ \t]*\*\// {
                comments++
                next
            }

            # Java/Scala multi-line comment line _maybe_

            /^[ \t]*\*/ {
                comments++
                next
            }

            # Python single line comment

            /^[ \t]*#/ {
                comments++
                next
            }

            # Java/Scala new (does not handle Scala case classes)

            /\ynew\y/ {
                    news++
            }

            # Java/Scala/Python import

            /\yimport\y/ {
                    imports++
            }

            # Java/Scala/Python class definition

            /\yclass\y/ {
                    classes++
            }

            # Branching statements

            /\yif\y/ {
                    ifs++
            }

            # When an if is not enough

            /\yelse\y|\yelif\y/ {
                    elses++
            }

            # Loops

            /\ywhile\y|\yfor\y|\yforeach\y|\ymap\y/ {
                    loops++
            }

            # Try blocks entered

            /\ytry\y/ {
                    trys++
            }

            # Exceptions thrown

            /\ythrow\y|\yraise\y/ {
                    throws++
            }


            END {
                # Print a report
                printf "%4d %3d %3d %3d %3d %3d %3d %3d %3d %3d %3d %s\n",
                       lines, imports, classes, loops, ifs,
                       elses, trys, throws, news, comments,
                       todos, file_name
            }
        ' < ${fn}
    fi
done | sort -nrk 1