Plots python source lines of code (as counted by sloccount) and PEP8 warnings (as reported by flake8) over time.

plot-python-sloc-pep8.sh

#!/bin/bash

# Copyright 2019 Matthieu Caneill
# Licensed unter WTFPL <http://www.wtfpl.net/txt/copying/>

# Plots python source lines of code (as counted by sloccount) and PEP8
# warnings (as reported by flake8) over time.
# It is meant to be used in a git repository.

# Usage:
# ./plot.sh <dir>
# ./plot.sh <dir> <start-timestamp>
# ./plot.sh <dir> <start-timestamp> <end-timestamp>

# <dir> is the folder in which code is looked for. It is often useful
# to not use "." to avoid code in virtual environments.
# <start-timestamp> and <end-timestamp> are optional, if given, the
# x-axis of the plot will fit within those values.

DIR=$1
START=$2
END=$3

DATA="plot.dat"
DATACLEAN="plot.clean.dat"
PLOT="plot.png"

rm $DATA $DATACLEAN

while :
do
    # loop stopped when code folder doesn't exist anymore
    test -e $DIR || break

    timestamp=$(git log --pretty=tformat:'%ad' --date='format:%s' | head -n 1)
    sloc=$(sloccount $DIR | grep -E '^python:' | cut -d: -f 2 | xargs | cut -d' ' -f 1)
    warn=$(flake8 $DIR | wc -l)

    echo $timestamp $sloc $warn >> $DATA

    # loop stopped when first git commit is reached
    git checkout "HEAD^" || break
done

# reverse the file for chronological order and remove duplicate
# entries (happens when commits do something else than touching python
# code)
tac $DATA | uniq -f 1 > $DATACLEAN

cat << EOF | gnuplot
set title "Python SLOC/PEP-8 warnings"

set xlabel "time" offset 0.0,-2.0
set ylabel "SLOC"
set y2label "Warnings" offset 4.0,0.0
set rmargin 9.0

set xdata time
set timefmt "%s"
set format x "%Y-%m"

set xrange [$START:$END]
set yrange [0:]
set y2range [0:]

set xtics rotate by 45 offset -4.0,-2.5
set ytics nomirror axis
set y2tics nomirror axis

set key top left
set key box

set grid

set style line 1 lw 3 lt rgb "#287e9b"
set style line 2 lw 3 lt rgb "#f27d18"

set terminal pngcairo size 900, 600
set output '$PLOT'

plot '$DATACLEAN' using 1:2 axes x1y1 with lines ls 1 title "SLOC", \
     '$DATACLEAN' using 1:3 axes x1y2 with lines ls 2 title "Warnings"
EOF