[PATCH 4/4] git-p4import: partial history

[Scott Lamb <slamb@slamb.org>]

Allow importing partial history, which is quicker and may be necessary with
a low Perforce MaxScanRows limit.

Signed-off-by: Scott Lamb <slamb@slamb.org>
---
 Documentation/git-p4import.txt |    6 ++++++
 git-p4import.py                |   14 ++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-p4import.txt b/Documentation/git-p4import.txt
index 714abbe..bf40b5a 100644
--- a/Documentation/git-p4import.txt
+++ b/Documentation/git-p4import.txt
@@ -10,6 +10,7 @@ SYNOPSIS
 --------
 [verse]
 `git-p4import` [-q|-v] [--notags] [--authors <file>] [-t <timezone>]
+               [--start-with <change>]
                <//p4repo/path> <branch>
 `git-p4import` --stitch <//p4repo/path>
 `git-p4import`
@@ -59,6 +60,11 @@ OPTIONS
 	etc.  You only need to specify this once, it will be saved in
 	the git config file for the repository.
 
+\--start-with::
+	Start the import with the given Perforce change. A partial history can
+	be much faster to generate and is possible even with a low MaxScanRows
+	limit.
+
 <//p4repo/path>::
 	The Perforce path that will be imported into the specified branch.
 
diff --git a/git-p4import.py b/git-p4import.py
index e7a52b3..c7a2033 100644
--- a/git-p4import.py
+++ b/git-p4import.py
@@ -33,7 +33,12 @@ def die(msg, *args):
     sys.exit(1)
 
 def usage():
-    print "USAGE: git-p4import [-q|-v]  [--authors=<file>]  [-t <timezone>]  [//p4repo/path <branch>]"
+    print "usage:"
+    print "  git-p4import [-q|-v] [--notags] [--authors <file>] [-t <timezone>]"
+    print "               [--start-with <change>]"
+    print "               <//p4repo/path> <branch>"
+    print "  git-p4import --stitch <//p4repo/path>"
+    print "  git-p4import"
     sys.exit(1)
 
 verbosity = 1
@@ -41,6 +46,7 @@ logfile = file("/dev/null", "a")
 ignore_warnings = False
 stitch = 0
 tagall = True
+start_with = 0
 
 def report(level, msg, *args):
     global verbosity
@@ -299,7 +305,8 @@ class git_command:
 
 try:
     opts, args = getopt.getopt(sys.argv[1:], "qhvt:",
-            ["authors=","help","stitch=","timezone=","log=","ignore","notags"])
+            ["authors=","help","stitch=","timezone=","log=","ignore","notags",
+             "start-with="])
 except getopt.GetoptError:
     usage()
 
@@ -316,6 +323,8 @@ for o, a in opts:
         usage()
     if o in ("--ignore"):
         ignore_warnings = True
+    if o in ("--start-with"):
+        start_with = int(a)
 
 git = git_command()
 branch=git.current_branch()
@@ -361,6 +370,7 @@ if stitch == 0:
     top = git.top_change(branch)
 else:
     top = 0
+top = max(top, start_with)
 changes = p4.changes(top)
 count = len(changes)
 if count == 0:
-- 
1.5.2