Identify which lines in master are modified by open pull requests

get-pr-modified-lines.sh

#!/bin/bash

# requires curl, jq, python

# set these variables
repo=scikit-learn/scikit-learn
remote=upstream
token=  # GitHub personal access token goes here

list_open_prs() {
    npages=$(curl -I "https://api.github.com/repos/$repo/pulls?state=open&per_page=100&access_token=$token&page=1" | grep ^Link: | grep -o 'page=[0-9]*>; rel="last"' | grep -o '[0-9][0-9]*')
    for i in $(seq 1 $npages)
    do
        curl "https://api.github.com/repos/$repo/pulls?state=open&per_page=100&access_token=$token&page=$i" | jq '.[] | .number'
    done
}
open_prs=$(list_open_prs)

git fetch $remote $(echo $open_prs | sed "s|[0-9][0-9]*|refs/pull/&/head:refs/remotes/$remote/pr/&|g")

rm lines-modified-merge{fail,success}
for pr in $open_prs
do
    git checkout -f --detach HEAD
    git reset --hard $remote/pr/$pr --
    mergestatus=success
    git merge --quiet --no-edit master >/dev/null || mergestatus=fail
    git diff -U1 master | grep -e '^---' -e '^@@' | sed 's/ +[0-9].*//' | python -c '
import sys
for l in sys.stdin:
    if l.startswith("---"):
        path = l.partition("/")[-1].rstrip()
    else:
        start = l.partition("-")[-1]
        start, n = start.split(",") if "," in start else (start, "2")
        for i in range(int(start), int(start) + int(n)):
            print(sys.argv[1], path, i, sep="\t")
' $pr  >> lines-modified-merge$mergestatus.txt || break
done