From 751f7b5255d861abc3105d3d971164293b3dec60 Mon Sep 17 00:00:00 2001
From: Ruslan Baratov <ruslan_baratov@yahoo.com>
Date: Sat, 10 Sep 2016 00:39:26 +0300
Subject: [PATCH] string(TIMESTAMP ...): add '%a' and '%b' format specifiers

%b: Abbreviated month name (e.g. Oct).
%a: Abbreviated weekday name (e.g. Fri).
---
 Help/command/string.rst                               |  2 ++
 Source/cmTimestamp.cxx                                |  2 ++
 .../CMakeTests/String-TIMESTAMP-MonthWeekNames.cmake  | 11 +++++++++++
 Tests/CMakeTests/StringTest.cmake.in                  |  3 +++
 4 files changed, 18 insertions(+)
 create mode 100644 Tests/CMakeTests/String-TIMESTAMP-MonthWeekNames.cmake

diff --git a/Help/command/string.rst b/Help/command/string.rst
index 19a095aed..802833328 100644
--- a/Help/command/string.rst
+++ b/Help/command/string.rst
@@ -278,12 +278,14 @@ specifiers:
    %I        The hour on a 12-hour clock (01-12).
    %j        The day of the current year (001-366).
    %m        The month of the current year (01-12).
+   %b        Abbreviated month name (e.g. Oct).
    %M        The minute of the current hour (00-59).
    %s        Seconds since midnight (UTC) 1-Jan-1970 (UNIX time).
    %S        The second of the current minute.
              60 represents a leap second. (00-60)
    %U        The week number of the current year (00-53).
    %w        The day of the current week. 0 is Sunday. (0-6)
+   %a        Abbreviated weekday name (e.g. Fri).
    %y        The last two digits of the current year (00-99)
    %Y        The current year.
 
diff --git a/Source/cmTimestamp.cxx b/Source/cmTimestamp.cxx
index 61b74dbdf..a94212c92 100644
--- a/Source/cmTimestamp.cxx
+++ b/Source/cmTimestamp.cxx
@@ -123,6 +123,8 @@ std::string cmTimestamp::AddTimestampComponent(char flag,
   formatString += flag;
 
   switch (flag) {
+    case 'a':
+    case 'b':
     case 'd':
     case 'H':
     case 'I':
diff --git a/Tests/CMakeTests/String-TIMESTAMP-MonthWeekNames.cmake b/Tests/CMakeTests/String-TIMESTAMP-MonthWeekNames.cmake
new file mode 100644
index 000000000..1cd44ffff
--- /dev/null
+++ b/Tests/CMakeTests/String-TIMESTAMP-MonthWeekNames.cmake
@@ -0,0 +1,11 @@
+string(TIMESTAMP output "%a;%b")
+message("~${output}~")
+
+list(LENGTH output output_length)
+
+set(expected_output_length 2)
+
+if(NOT output_length EQUAL ${expected_output_length})
+    message(FATAL_ERROR "expected ${expected_output_length} entries in output "
+        "with all specifiers; found ${output_length}")
+endif()
diff --git a/Tests/CMakeTests/StringTest.cmake.in b/Tests/CMakeTests/StringTest.cmake.in
index aba35fe5f..a45b2056e 100644
--- a/Tests/CMakeTests/StringTest.cmake.in
+++ b/Tests/CMakeTests/StringTest.cmake.in
@@ -36,6 +36,8 @@ set(TIMESTAMP-IncompleteSpecifier-RESULT 0)
 set(TIMESTAMP-IncompleteSpecifier-STDERR "~foobar%~")
 set(TIMESTAMP-AllSpecifiers-RESULT 0)
 set(TIMESTAMP-AllSpecifiers-STDERR "~[0-9]+(;[0-9]+)*~")
+set(TIMESTAMP-MonthWeekNames-RESULT 0)
+set(TIMESTAMP-MonthWeekNames-STDERR "~[^%]+;[^%]+~")
 set(TIMESTAMP-UnixTime-RESULT 0)
 set(TIMESTAMP-UnixTime-STDERR "~[1-9][0-9]+~")
 
@@ -60,6 +62,7 @@ check_cmake_test(String
   TIMESTAMP-UnknownSpecifier
   TIMESTAMP-IncompleteSpecifier
   TIMESTAMP-AllSpecifiers
+  TIMESTAMP-MonthWeekNames
   TIMESTAMP-UnixTime
   )