github: add prs_for_diff.sh to generate PR links for release

Signed-off-by: Jakub Sokołowski <jakub@status.im>

github/prs_for_diff.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+START=$1
+STOP=$2
+REPO=${3:-status-im/status-react}
+
+GH_URL=https://api.github.com
+
+function ghapi() {
+    curl -s -H "Authorization: token ${GH_TOKEN}" $@
+}
+
+if [[ -z "${@}" ]]; then
+    echo "Usage: prs_for_diff.sh release/1.0.x release/1.1.x status-im/status-react"
+    exit 1
+fi
+
+if [[ -z "${GH_TOKEN}" ]]; then
+    echo "No GH_TOKEN env variable set!" 1>&2
+    exit 1
+fi
+
+echo "Querying ${REPO}: ${START}...${STOP}"
+echo
+COMMITS=$(ghapi "${GH_URL}/repos/${REPO}/compare/${START}...${STOP}" | jq -r '.commits[].sha' | sort | uniq)
+
+for SHA in $COMMITS; do
+    PR_JSON=$(ghapi "${GH_URL}/search/issues?q=repo:${REPO}+type:pr+${SHA}" | jq '.items[0]')
+    if [[ -z "${PR_JSON}" ]]; then
+        echo "WARNING: No PR for: ${SHA}" 1>&2
+        continue;
+    fi
+    URL=$(echo "${PR_JSON}" | jq -r .html_url)
+    TITLE=$(echo "${PR_JSON}" | jq -r .title)
+    NUMBER=$(echo "${PR_JSON}" | jq -r .number)
+    # format as markdown links
+    echo "* [#${NUMBER}](${URL}) - ${TITLE}"
+    sleep 0.8
+done