github_clones

#!/usr/bin/env bash

# make bash behave
set -euo pipefail
IFS=$'\n\t'

# constants
stdout=1
stderr=2
success=0
badusage=64

hubauth="Authorization: token ${GITHUB_TOKEN}"
preview="Accept: application/vnd.github.spiderman-preview"

jq=$(which jq)

# outputs usage message on specified device before exiting with provided status
usage() {
  cat <<'E_O_USAGE' >&"$1"
usage: github_clones repo [since]

    repo : a citusdata GitHub repository name
    since : a date (optional) in YYYY-MM-DD format

github_clones outputs CSV-formatted daily GitHub clone counts for a given repo
in the citusdata org. The optional 'since' parameter can be used to provide a
custom start date: without one, all known data is requested, though GitHub's
maximum window is only two weeks long.
E_O_USAGE

  exit "${2}"
}

if [ "$#" -eq 1 ]; then
  if [ "${1}" = '-h' ]; then
    usage $stdout $success
  fi
  since="1970-01-01T00:00:00Z"
elif [ "$#" -eq 2 ]; then
  since="${2}T00:00:00Z"
else
  usage $stderr $badusage
fi

echo '"os","release","name","pg_version","version","date","downloads"'

repo=${1}
trafficurl="https://api.github.com/repos/citusdata/${repo}/traffic/clones"

curl -sf -H "${hubauth}" -H "${preview}" "${trafficurl}" |
  ${jq} -r "include \"pkg\"; .clones[] | filterdate(\"${since}\") | makeclonerows(\"${repo}\") | @csv"