cmdutil: move -M / --reuse-message handling to cmdutil.logmessage

Summary:
This just moves `-M / --reuse-message` handling from the `commit` command
to a lower layer, making it more reusable.

Reviewed By: xavierd

Differential Revision: D17168992

fbshipit-source-id: 4fe7e93ceae45eff281214dcff03ef3f9ee0c898

edenscm/mercurial/cmdutil.py

@@ -857,6 +857,19 @@ def bailifchanged(repo, merge=True, hint=None):
 def logmessage(repo, opts):
     """ get the log message according to -m and -l option """
     ui = repo.ui
+
+    # Allow the commit message from another commit to be reused.
+    reuserev = opts.get("reuse_message")
+    if reuserev:
+        incompatibleopts = ["message", "logfile"]
+        currentinvaliopts = [opt for opt in incompatibleopts if opts.get(opt)]
+        if currentinvaliopts:
+            raise error.Abort(
+                _("--reuse-message and --%s are mutually exclusive")
+                % (currentinvaliopts[0])
+            )
+        opts["message"] = scmutil.revsingle(repo, reuserev).description()
+
     message = opts.get("message")
     logfile = opts.get("logfile")
 

edenscm/mercurial/commands/__init__.py

@@ -1714,18 +1714,6 @@ def _docommit(ui, repo, *pats, **opts):
 
     opts = pycompat.byteskwargs(opts)
 
-    # Allow the commit message from another commit to be reused.
-    reuserev = opts.get("reuse_message")
-    if reuserev:
-        incompatibleopts = ["message", "logfile"]
-        currentinvaliopts = [opt for opt in incompatibleopts if opts.get(opt)]
-        if currentinvaliopts:
-            raise error.Abort(
-                _("--reuse-message and --%s are mutually exclusive")
-                % (currentinvaliopts[0])
-            )
-        opts["message"] = scmutil.revsingle(repo, reuserev).description()
-
     cmdutil.checkunfinished(repo, commit=True)
 
     branch = repo[None].branch()