use logs rather than skimming github pages

2 files changed, 25 insertions, 188 deletions

diff --git a/pr2relnotes.py b/pr2relnotes.py
deleted file mode 100755
index 7a23fda..0000000
--- a/pr2relnotes.py
+++ /dev/null
@@ -1,188 +0,0 @@
-#!/usr/bin/env python
-
-## Install info
-##   $ virtualenv env
-##   $ source env/bin/activate
-##   $ pip install PyGithub
-##
-## Examples:
-##   Find the differences from last tag to current
-##   $ pr2relnotes.py alpha-6 HEAD
-
-import argparse
-import re
-import os
-import subprocess
-from github import Github
-from github import GithubException
-
-
-def dprint(*args):
-    if VERBOSE:
-        print str(args)
-
-def get_args():
-    """
-    Get command line arguments
-    """
-    parser = argparse.ArgumentParser(description="Find the PR's between two versions")
-    parser.add_argument("old", help = "old version to use")
-    parser.add_argument("new", help = "new version to use")
-    parser.add_argument("-v", "--verbose", help="Enable debug output",
-                        default=False,
-                        action="store_true")
-    parser.add_argument("-f", "--file",
-                        help="Output file to store results (default: tagdiff.md)",
-                        default="tagdiff.md")
-    return parser.parse_args()
-
-def search_prs(log):
-    """
-    Search lines of text for PR numbers
-    """
-    # Find all matches using regex iterator, using the PR # as the group match
-    resultlist = [str(m.group(1)) for m in re.finditer(r"erge pull request #(\d+)", log)]
-    return sorted(resultlist)
-
-def get_env(env):
-    return os.environ[env]
-
-def get_formatted_issue(repo, issue, title, url):
-    """
-    Single place to adjust formatting output of PR data
-    """
-    # Newline support writelines() call which doesn't add newlines
-    # on its own
-    return("* {}/{}: [{}]({})\n".format(repo, issue, title.encode('utf-8'), url))
-
-def gh_get_issue_output(org, repo, issuenum):
-    """
-    Look up PR information using the GitHub api
-    """
-    # Attempt to look up the PR, and don't take down the whole
-    # shebang if a API call fails
-    # This will fail often on forks who don't have the
-    # PRs numbers associated with the forked account
-    # Return empty string on error
-    try:
-        repoObj = gh.get_repo(org + "/" + repo)
-        issue = repoObj.get_issue(int(issuenum))
-        title = issue.title
-        html_url = issue.html_url
-    except GithubException as e:
-        print "Github error({0}): {1}".format(e.status, e.data)
-        return ""
-    except:
-        print "Some github error"
-        return ""
-
-    return(get_formatted_issue(repo, issuenum, title, html_url))
-
-
-def get_org(repourl):
-    """
-    Simple function to parse the organization out of a GitHub URL
-    """
-    dprint("Current repourl to search: " + repourl)
-    # GitHub URLs can be:
-    #    http[s]://www.github.com/org/repo
-    # or           git@github.com:/org/repo
-    pattern = re.compile(r"github.com[/:]+(\w+)/")
-    m = re.search(pattern, repourl)
-    # Fail fast if this is wrong so we can add a pattern to the search
-    if m:
-        return m.group(1)
-    else:
-        raise Exception("Incorrect regex pattern finding repo org")
-
-def get_name(repourl):
-    """
-    Simple function to parse the repository name out of a GitHub URL
-    """
-    dprint("Current repourl to search: " + repourl)
-    repo_pattern = re.compile(r"github.com[/:]\w+/(\w+)")
-    m = re.search(repo_pattern, repourl)
-    if m:
-        return m.group(1)
-    else:
-        raise Exception("Incorrect rexex pattern finding repo url")
-
-def get_repo_url_from_remote():
-    """
-    Function that gets the repository URL from the `git remote` listing
-    """
-    git_remote_bytes = subprocess.check_output(["git", "remote", "-v"])
-    # check_output returns the command results in raw byte format
-    remote_string = git_remote_bytes.decode('utf-8')
-
-    pattern = re.compile(r"github.com[/:]\w+/\w+")
-    m = re.search(pattern, remote_string)
-    if m:
-        return m.group(0)
-    else:
-        raise Exception("Incorrect rexex pattern finding repo url")
-
-def process_log(gitlog, repo_url):
-    """
-    Handles the processing of the gitlog and returns a list
-    of PRs already formatted for output
-    """
-    pr_list = search_prs(gitlog)
-    repoorg = get_org(repo_url)
-    reponame = get_name(repo_url)
-    pr_buffer = []
-    for issue in pr_list:
-            pr_buffer.append(gh_get_issue_output(repoorg, reponame, issue))
-
-    return pr_buffer
-
-def fetch_log(old_ver, new_ver):
-    """
-    Function that processes the git log between the old and new versions
-    """
-    dprint("Current working directory", os.getcwd())
-    gitlogbytes = subprocess.check_output(["git", "log",
-                                           str(old_ver + ".." + new_ver)])
-    return gitlogbytes.decode('utf-8')
-
-
-def compare_versions(repo_url, old_ver, new_ver):
-    # Formatted list of all PRs for all repos
-    pr_out = []
-    gitlog = fetch_log(old_ver, new_ver)
-    pr_out.extend(process_log(gitlog, repo_url))
-    return pr_out
-
-def main():
-    args = get_args()
-
-    # Setup the GitHub object for later use
-    global gh
-    gh = Github(get_env("GHAUTH"))
-
-    if gh == "":
-        raise Exception("Env var GHAUTH must be set to a valid GitHub API key")
-
-    if args.verbose:
-        global VERBOSE
-        VERBOSE=True
-
-    dprint("Inspecting difference in between: ", args.old, " and ", args.new)
-
-    # Find the github URL of the repo we are operating on
-    repo_url = get_repo_url_from_remote()
-
-    # Compare old and new versions
-    pr_list = compare_versions(repo_url, args.old, args.new)
-
-    # Writeout PR listing
-    print "Writing output to file %s" % args.file
-    with open(args.file, 'w') as output:
-        output.writelines(pr_list)
-
-
-if __name__ == "__main__":
-    VERBOSE=False
-    gh=None
-    topdir=os.getcwd()
-    main()
diff --git a/pr2relnotes.sh b/pr2relnotes.sh
new file mode 100755
index 0000000..28712bb
--- /dev/null
+++ b/pr2relnotes.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env sh
+
+if [ -z $1 ]
+then
+    echo "usage: $0 <tag> [pull-request-url]"
+    exit 0
+fi
+export url=${2:-"https://github.com/erlang/rebar3/pull/"}
+
+git log --merges --pretty=medium $1..HEAD | \
+awk -v url=$url '
+    # first line of a merge commit entry
+    /^commit / {mode="new"}
+
+    # merge commit default message
+    / +Merge pull request/ {
+        page_id=substr($4, 2, length($4)-1);
+        mode="started";
+        next;
+    }
+
+    # line of content including title
+    mode=="started" && /    [^ ]+/ {
+        print "- [" substr($0, 5) "](" url page_id ")"; mode="done"
+    }'