merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 53 insertions, 0 deletions

diff --git a/third_party/git/git-gui/lib/date.tcl b/third_party/git/git-gui/lib/date.tcl
new file mode 100644
index 000000000000..abe82992b652
--- /dev/null
+++ b/third_party/git/git-gui/lib/date.tcl
@@ -0,0 +1,53 @@
+# git-gui date processing support
+# Copyright (C) 2007 Shawn Pearce
+
+set git_month(Jan)  1
+set git_month(Feb)  2
+set git_month(Mar)  3
+set git_month(Apr)  4
+set git_month(May)  5
+set git_month(Jun)  6
+set git_month(Jul)  7
+set git_month(Aug)  8
+set git_month(Sep)  9
+set git_month(Oct) 10
+set git_month(Nov) 11
+set git_month(Dec) 12
+
+proc parse_git_date {s} {
+	if {$s eq {}} {
+		return {}
+	}
+
+	if {![regexp \
+		{^... (...) (\d{1,2}) (\d\d):(\d\d):(\d\d) (\d{4}) ([+-]?)(\d\d)(\d\d)$} $s s \
+		month day hr mm ss yr ew tz_h tz_m]} {
+		error [mc "Invalid date from Git: %s" $s]
+	}
+
+	set s [clock scan [format {%4.4i%2.2i%2.2iT%2s%2s%2s} \
+			$yr $::git_month($month) $day \
+			$hr $mm $ss] \
+			-gmt 1]
+
+	regsub ^0 $tz_h {} tz_h
+	regsub ^0 $tz_m {} tz_m
+	switch -- $ew {
+	-  {set ew +}
+	+  {set ew -}
+	{} {set ew -}
+	}
+
+	return [expr "$s $ew ($tz_h * 3600 + $tz_m * 60)"]
+}
+
+proc format_date {s} {
+	if {$s eq {}} {
+		return {}
+	}
+	return [clock format $s -format {%a %b %e %H:%M:%S %Y}]
+}
+
+proc reformat_date {s} {
+	return [format_date [parse_git_date $s]]
+}