patman: Move main code out to a control module

To make testing easier, move the code out from main into a separate
'control' module and split it into four parts: setup, preparing patches,
checking patches and emailing patches.

Add comments and fix a few code-style issues while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 170 insertions, 0 deletions

diff --git a/tools/patman/control.py b/tools/patman/control.py
new file mode 100644
index 0000000..a896c92
--- /dev/null
+++ b/tools/patman/control.py
@@ -0,0 +1,170 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2020 Google LLC
+#
+"""Handles the main control logic of patman
+
+This module provides various functions called by the main program to implement
+the features of patman.
+"""
+
+import os
+import sys
+
+from patman import checkpatch
+from patman import gitutil
+from patman import patchstream
+from patman import terminal
+
+def setup():
+    """Do required setup before doing anything"""
+    gitutil.Setup()
+
+def prepare_patches(col, count, start, ignore_binary):
+    """Figure out what patches to generate, then generate them
+
+    The patch files are written to the current directory, e.g. 0001_xxx.patch
+    0002_yyy.patch
+
+    Args:
+        col (terminal.Color): Colour output object
+        count (int): Number of patches to produce, or -1 to produce patches for
+            the current branch back to the upstream commit
+        start (int): Start partch to use (0=first / top of branch)
+        ignore_binary (bool): Don't generate patches for binary files
+
+    Returns:
+        Tuple:
+            Series object for this series (set of patches)
+            Filename of the cover letter as a string (None if none)
+            patch_files: List of patch filenames, each a string, e.g.
+                ['0001_xxx.patch', '0002_yyy.patch']
+    """
+    if count == -1:
+        # Work out how many patches to send if we can
+        count = (gitutil.CountCommitsToBranch() - start)
+
+    if not count:
+        sys.exit(col.Color(col.RED,
+                           'No commits found to process - please use -c flag'))
+
+    # Read the metadata from the commits
+    to_do = count
+    series = patchstream.GetMetaData(start, to_do)
+    cover_fname, patch_files = gitutil.CreatePatches(
+        start, to_do, ignore_binary, series)
+
+    # Fix up the patch files to our liking, and insert the cover letter
+    patchstream.FixPatches(series, patch_files)
+    if cover_fname and series.get('cover'):
+        patchstream.InsertCoverLetter(cover_fname, series, to_do)
+    return series, cover_fname, patch_files
+
+def check_patches(series, patch_files, run_checkpatch, verbose):
+    """Run some checks on a set of patches
+
+    This santiy-checks the patman tags like Series-version and runs the patches
+    through checkpatch
+
+    Args:
+        series (Series): Series object for this series (set of patches)
+        patch_files (list): List of patch filenames, each a string, e.g.
+            ['0001_xxx.patch', '0002_yyy.patch']
+        run_checkpatch (bool): True to run checkpatch.pl
+        verbose (bool): True to print out every line of the checkpatch output as
+            it is parsed
+
+    Returns:
+        bool: True if the patches had no errors, False if they did
+    """
+    # Do a few checks on the series
+    series.DoChecks()
+
+    # Check the patches, and run them through 'git am' just to be sure
+    if run_checkpatch:
+        ok = checkpatch.CheckPatches(verbose, patch_files)
+    else:
+        ok = True
+    return ok
+
+
+def email_patches(col, series, cover_fname, patch_files, process_tags, its_a_go,
+                  ignore_bad_tags, add_maintainers, limit, dry_run, in_reply_to,
+                  thread, smtp_server):
+    """Email patches to the recipients
+
+    This emails out the patches and cover letter using 'git send-email'. Each
+    patch is copied to recipients identified by the patch tag and output from
+    the get_maintainer.pl script. The cover letter is copied to all recipients
+    of any patch.
+
+    To make this work a CC file is created holding the recipients for each patch
+    and the cover letter. See the main program 'cc_cmd' for this logic.
+
+    Args:
+        col (terminal.Color): Colour output object
+        series (Series): Series object for this series (set of patches)
+        cover_fname (str): Filename of the cover letter as a string (None if
+            none)
+        patch_files (list): List of patch filenames, each a string, e.g.
+            ['0001_xxx.patch', '0002_yyy.patch']
+        process_tags (bool): True to process subject tags in each patch, e.g.
+            for 'dm: spi: Add SPI support' this would be 'dm' and 'spi'. The
+            tags are looked up in the configured sendemail.aliasesfile and also
+            in ~/.patman (see README)
+        its_a_go (bool): True if we are going to actually send the patches,
+            False if the patches have errors and will not be sent unless
+            @ignore_errors
+        ignore_bad_tags (bool): True to just print a warning for unknown tags,
+            False to halt with an error
+        add_maintainers (bool): Run the get_maintainer.pl script for each patch
+        limit (int): Limit on the number of people that can be cc'd on a single
+            patch or the cover letter (None if no limit)
+        dry_run (bool): Don't actually email the patches, just print out what
+            would be sent
+        in_reply_to (str): If not None we'll pass this to git as --in-reply-to.
+            Should be a message ID that this is in reply to.
+        thread (bool): True to add --thread to git send-email (make all patches
+            reply to cover-letter or first patch in series)
+        smtp_server (str): SMTP server to use to send patches (None for default)
+    """
+    cc_file = series.MakeCcFile(process_tags, cover_fname, not ignore_bad_tags,
+                                add_maintainers, limit)
+
+    # Email the patches out (giving the user time to check / cancel)
+    cmd = ''
+    if its_a_go:
+        cmd = gitutil.EmailPatches(
+            series, cover_fname, patch_files, dry_run, not ignore_bad_tags,
+            cc_file, in_reply_to=in_reply_to, thread=thread,
+            smtp_server=smtp_server)
+    else:
+        print(col.Color(col.RED, "Not sending emails due to errors/warnings"))
+
+    # For a dry run, just show our actions as a sanity check
+    if dry_run:
+        series.ShowActions(patch_files, cmd, process_tags)
+        if not its_a_go:
+            print(col.Color(col.RED, "Email would not be sent"))
+
+    os.remove(cc_file)
+
+def send(options):
+    """Create, check and send patches by email
+
+    Args:
+        options (optparse.Values): Arguments to patman
+    """
+    setup()
+    col = terminal.Color()
+    series, cover_fname, patch_files = prepare_patches(
+        col, options.count, options.start, options.ignore_binary)
+    ok = check_patches(series, patch_files, options.check_patch,
+                       options.verbose)
+    its_a_go = ok or options.ignore_errors
+    if its_a_go:
+        email_patches(
+            col, series, cover_fname, patch_files, options.process_tags,
+            its_a_go, options.ignore_bad_tags, options.add_maintainers,
+            options.limit, options.dry_run, options.in_reply_to, options.thread,
+            options.smtp_server)