From 3946794e8dc16f44786e89f6d4883e117d3091a9 Mon Sep 17 00:00:00 2001
From: Benedikt Volkel <benedikt.volkel@cern.ch>
Date: Wed, 13 Mar 2024 13:33:04 +0100
Subject: [PATCH] Get all labels and change table organisation

Logic is now the following:

1. Fetch all labels (optionally given some regex).
2. Get closed PRs that have at least one of those labels.
3. Split into merged and not merged.
4. Populate a table per label and list merged PRs.
   (A PR can therefore appear in more than one table.)
5. Write everything to a txt file.
---
 UTILS/o2dpg_make_github_pr_report.py | 118 ++++++++++++++++++++-------
 1 file changed, 90 insertions(+), 28 deletions(-)

diff --git a/UTILS/o2dpg_make_github_pr_report.py b/UTILS/o2dpg_make_github_pr_report.py
index b6a4ac9c9..f2bd24bda 100755
--- a/UTILS/o2dpg_make_github_pr_report.py
+++ b/UTILS/o2dpg_make_github_pr_report.py
@@ -6,6 +6,7 @@
 import sys
 import argparse
 import requests
+import re
 
 
 def organise_prs(prs):
@@ -29,23 +30,21 @@ def organise_prs(prs):
         merged_at.append(pr['merged_at'])
 
     # sort the merged PRs by their merged timestamp
-    prs_merged = [pr for _, pr in sorted(zip(merged_at, prs))]
+    prs_merged = [pr for _, pr in sorted(zip(merged_at, prs_merged))]
 
     return prs_merged, prs_other
 
 
-def get_prs(owner, repo, prod_label, pr_state, include_unmerged, per_page=50, start_page=1, pages=1):
+def get_prs(owner, repo, request_labels, pr_state, per_page=50, start_page=1, pages=1):
     """
     Get PRs according to some selection
     """
     # GitHub API endpoint for listing closed pull requests with a specific label
-    merged_token = '&is:merged=true' if not include_unmerged else ''
     prs_return = []
 
     has_error = False
     for page in range(start_page, pages + 1):
-        url = f'https://api.github.com/repos/{owner}/{repo}/pulls?state={pr_state}{merged_token}&page={page}&per_page={per_page}'
-        print(f'Fetch PRs accrodring to {url}')
+        url = f'https://api.github.com/repos/{owner}/{repo}/pulls?state={pr_state}&page={page}&per_page={per_page}'
 
         # Send GET request to GitHub API
         response = requests.get(url)
@@ -57,13 +56,13 @@ def get_prs(owner, repo, prod_label, pr_state, include_unmerged, per_page=50, st
             # PRs to return because we filter on a specific label
             for pr in prs:
                 labels = pr['labels']
-                accept = False
+                take_pr = False
                 for label in labels:
-                    if label['name'] == prod_label:
+                    if label['name'] in request_labels:
                         # only with the correct the label will be accepted
-                        accept = True
+                        take_pr = True
                         break
-                if not accept:
+                if not take_pr:
                     continue
                 # we will end up here if accepted, so append
                 prs_return.append(pr)
@@ -80,37 +79,97 @@ def get_prs(owner, repo, prod_label, pr_state, include_unmerged, per_page=50, st
     return organise_prs(prs_return)
 
 
-def make_report(prs_merged, prs_other, outfile):
+def get_labels(owner, repo, regex=None):
+    """
+    Get the labels that match given regex
+    """
+    # the REST API url
+    url = f'https://api.github.com/repos/{owner}/{repo}/labels'
+    # Send GET request to GitHub API
+    response = requests.get(url)
+
+    if response.status_code != 200:
+        print(f'ERROR: Problem to retrieve labels for owner {owner} and repository {repo}')
+        return None
+
+    return [label['name'] for label in response.json() if not repo or re.match(regex, label['name'])]
+
+
+def separate_labels_request_accept(labels, accept_suffix=None):
+    """
+    Disentangle labels and <label>-accepted
+    """
+    if not accept_suffix:
+        # all labels are considered request labels
+        return labels.copy(), []
+
+    labels_request = []
+    labels_accept = []
+
+    for label in labels:
+        if label.endswith(accept_suffix):
+            labels_accept.append(label)
+            continue
+        labels_request.append(label)
+
+    return labels_request, labels_accept
+
+
+def make_report(prs_merged, prs_other, repo, labels_request, label_accept_suffix, outfile):
     """
     Make a report
 
-    simply dump into text file
+    The report consists of one table per label which will be written to a text file.
     """
+    # common header for each single table
+    common_header = '| Requestor | Package | PR | PR title | Merged at | Data or MC |\n| --- | --- | --- | --- | --- | --- |\n'
+    rows_per_label = {label: [] for label in labels_request}
 
     with open(outfile, 'w') as f:
-        f.write('# FROM OLDEST TO RECENT\n')
-        # our common header
-        f.write('| Date of next tag | Requestor | Package | PR | Data or MC | Comment | JIRA (if it exists) | Accepted | In production | Validated by requestor |\n')
-        f.write('| ---------------- | ------------ | ------- | --------------------------------------------------------:|:--------------------------------------------- | ------------------- | ---------------- | ------------- |-------------| ------------------|\n')
+
+        f.write(f'Merged PRs: {len(prs_merged)}\nOther closed PRs: {len(prs_other)}\nLabels: {", ".join(labels_request)}\n\n')
+        f.write('# List PRs from oldest to recent (merged)\n')
 
         # first put the merged PRs
         for pr in prs_merged:
             mc_data = []
+            # collect the labels for which table this PR should be taken into account
+            labels_take = []
 
             for label in pr['labels']:
-                if label['name'] in ('MC', 'DATA'):
+                label_name = label['name']
+                if label_name.lower() in ('mc', 'data'):
                     # get assigned MC or DATA label if this PR has it
                     mc_data.append(label['name'])
+                if label_name in labels_request and (not label_accept_suffix or f'{label_name}-{label_accept_suffix}' not in pr['labels']):
+                    # check if that label is one that flags a request. If at the same time there is also the corresponding accepted label, don't take this PR into account for the report.
+                    labels_take.append(label_name)
+
+            if not labels_take:
+                # no labels of interest
+                continue
 
             # if no specific MC or DATA label, assume valid for both
             mc_data = ','.join(mc_data) if mc_data else 'MC,DATA'
-            # add the full line to the output file
-            f.write(f'| {args.date} | {pr["user"]["login"]} | {args.repo} | [PR]({pr["html_url"]}) | {mc_data} |  {pr["title"]} |  | | |  |\n')
+            for label in labels_take:
+                rows_per_label[label].append(f'| {pr["user"]["login"]} | {repo} | [PR]({pr["html_url"]}) | {pr["title"]} | {pr["merged_at"]} | {mc_data} |\n')
+
+        for label, rows in rows_per_label.items():
+            if not rows:
+                # nothing to add here
+                continue
+            f.write(f'\n==> START label {label} <==\n')
+            f.write(common_header)
+            for row in rows:
+                f.write(row)
+            f.write(f'==> END label {label} <==\n')
 
         # add all the other commits
-        f.write('OTHER PRs\n')
+        f.write('\n# Other PRs (not merged)\n')
         for pr in prs_other:
-            f.write(f'| {args.date} | {pr["user"]["login"]} | {args.repo} | [PR]({pr["html_url"]}) |  |  {pr["title"]} |  | | |  |\n')
+            f.write(f'| {pr["user"]["login"]} | {repo} | [PR]({pr["html_url"]}) | {pr["title"]} | not merged | {", ".join(labels_take)} | {mc_data} |\n')
+
+    print(f"==> Report written to {outfile}")
 
 
 if __name__ == '__main__':
@@ -118,24 +177,27 @@ def make_report(prs_merged, prs_other, outfile):
     parser = argparse.ArgumentParser(description='Retrieve closed pull requests with a specific label from a GitHub repository')
     parser.add_argument('--owner', help='GitHub repository owner', default='AliceO2Group')
     parser.add_argument('--repo', required=True, help='GitHub repository name, e.g. O2DPG or AliceO2')
-    parser.add_argument('--prod-label', dest='prod_label', required=True, help='Production label to filter PRs')
     parser.add_argument('--pr-state', dest='pr_state', default='closed', help='The state of the PR')
-    parser.add_argument('--include-unmerged', dest='include_unmerged', action='store_true', help='To fetch also unmerged PRs')
     parser.add_argument('--output', default='o2dpg_pr_report.txt')
-    parser.add_argument('--date', help='The date tag to be put', required=True)
     parser.add_argument('--per-page', dest='per_page', default=50, help='How many results per page')
     parser.add_argument('--start-page', dest='start_page', type=int, default=1, help='Start on this page')
     parser.add_argument('--pages', type=int, default=1, help='Number of pages')
-
-
+    parser.add_argument('--label-regex', dest='label_regex', help='Provide a regular expression to decide which labels to fetch.', default='^async-\w+')
+    parser.add_argument('--label-accepted-suffix', dest='label_accepted_suffix', help='Provide a regular expression to decide which labels to fetch.', default='accept')
+    parser.add_argument('--include-accepted', action='store_true', help='By default, only PRs are fetched where at least one label has no "<label>-accepted" label')
     args = parser.parse_args()
 
-    # Retrieve closed pull requests with the specified label
-    prs_merged, prs_other = get_prs(args.owner, args.repo, args.prod_label, args.pr_state, args.include_unmerged, args.per_page, args.start_page, args.pages)
+    # get all labels of interest
+    labels = get_labels(args.owner, args.repo, args.label_regex)
+    # split into request and accept labels, here we currently only need the request labels
+    labels_request, _ = separate_labels_request_accept(labels, args.label_accepted_suffix)
+
+    # Retrieve closed pull requests with the specified label, split into merged and other (closed) PRs
+    prs_merged, prs_other = get_prs(args.owner, args.repo, labels_request, args.pr_state, args.per_page, args.start_page, args.pages)
     if prs_merged is None:
         print('ERROR: There was a problem fetching the info.')
         sys.exit(1)
 
-    make_report(prs_merged, prs_other, args.output)
+    make_report(prs_merged, prs_other, args.repo, labels_request, args.label_accepted_suffix, args.output)
 
     sys.exit(0)