add generate_graph.sh

This commit introduces a script that parses update markdown and displays a plot via gnuplot

$ ./tools/generate_graph.sh -h
usage: ./tools/generate_graph.sh -t -p

This script creates a gnuplot by parsing the markdown from within 'docs'

OPTIONS:

  -t        include testing updates
  -p        include prod updates
  -d        distributions (cc7,c8,cs8). default is 'all'
  -s        filter start date (YYYYMMDD). default is to not filter
  -e        filter end date (YYYMMDD). default is to not filter
  -x        exclude number of packages over this figure
  -h        display this help

As an example, the following would create a graph similar to the below ./tools/generate_graph.sh -t -s 20210101 -x 1000

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• cffcb8ca - * change behaviour to create plots for both test and prod by default

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• c0ded3a1 - add ability to control distribution/release type

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• 54f45091 - add ability to control distribution/release type

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• 7bd09e89 - add startdate/enddate parameters

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• 67843d87 - add ability to exclude packages over a certain threshold

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• 04b892b2 - cleanup

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The -x flag seems weird to me. I get fixing the max y-axis, but not showing those updates at all?

If you run ./tools/generate_graph.sh -t -s 20210101 (no exclude) you will see that in January 2021 we had 6000 'new' packages for cs8. This correlates to the day when we first started writing updates for CS8, but it doesn't mean that there were 6000 'new' packages for cs8 on that day ... This is what -x is meant to 'fix'. If you can think of a better way of doing it?

Oh, I see, I thought it was to not let point release updates "hide" all the little daily updates by crushing the axis. What about a log scale?

hmmm, setting set logscale y and re-running the script with ./tools/generate_graph.sh -t -s 20210101 gives the following result. Not that pretty.

ouch.

mentioned in commit 5ad4549d

merged