4 files changed, 55 insertions, 0 deletions
diff --git a/gitlint-core/gitlint/contrib/__init__.py b/gitlint-core/gitlint/contrib/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/gitlint-core/gitlint/contrib/__init__.py
diff --git a/gitlint-core/gitlint/contrib/rules/__init__.py b/gitlint-core/gitlint/contrib/rules/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/gitlint-core/gitlint/contrib/rules/__init__.py
diff --git a/gitlint-core/gitlint/contrib/rules/conventional_commit.py b/gitlint-core/gitlint/contrib/rules/conventional_commit.py
new file mode 100644
index 0000000..9c9d5cb
--- /dev/null
+++ b/gitlint-core/gitlint/contrib/rules/conventional_commit.py
@@ -0,0 +1,37 @@
+import re
+
+from gitlint.options import ListOption
+from gitlint.rules import CommitMessageTitle, LineRule, RuleViolation
+
+RULE_REGEX = re.compile(r"([^(]+?)(\([^)]+?\))?!?: .+")
+
+
+class ConventionalCommit(LineRule):
+    """ This rule enforces the spec at https://www.conventionalcommits.org/. """
+
+    name = "contrib-title-conventional-commits"
+    id = "CT1"
+    target = CommitMessageTitle
+
+    options_spec = [
+        ListOption(
+            "types",
+            ["fix", "feat", "chore", "docs", "style", "refactor", "perf", "test", "revert", "ci", "build"],
+            "Comma separated list of allowed commit types.",
+        )
+    ]
+
+    def validate(self, line, _commit):
+        violations = []
+        match = RULE_REGEX.match(line)
+
+        if not match:
+            msg = "Title does not follow ConventionalCommits.org format 'type(optional-scope): description'"
+            violations.append(RuleViolation(self.id, msg, line))
+        else:
+            line_commit_type = match.group(1)
+            if line_commit_type not in self.options["types"].value:
+                opt_str = ', '.join(self.options['types'].value)
+                violations.append(RuleViolation(self.id, f"Title does not start with one of {opt_str}", line))
+
+        return violations
diff --git a/gitlint-core/gitlint/contrib/rules/signedoff_by.py b/gitlint-core/gitlint/contrib/rules/signedoff_by.py
new file mode 100644
index 0000000..139a1b1
--- /dev/null
+++ b/gitlint-core/gitlint/contrib/rules/signedoff_by.py
@@ -0,0 +1,18 @@
+
+from gitlint.rules import CommitRule, RuleViolation
+
+
+class SignedOffBy(CommitRule):
+    """ This rule will enforce that each commit body contains a "Signed-off-by" line.
+    We keep things simple here and just check whether the commit body contains a line that starts with "Signed-off-by".
+    """
+
+    name = "contrib-body-requires-signed-off-by"
+    id = "CC1"
+
+    def validate(self, commit):
+        for line in commit.message.body:
+            if line.lower().startswith("signed-off-by"):
+                return []
+
+        return [RuleViolation(self.id, "Body does not contain a 'Signed-off-by' line", line_nr=1)]