From 44e85d48df1ecc95547d066459a1e904f128618c Mon Sep 17 00:00:00 2001
From: Iain Patterson <me@iain.cx>
Date: Thu, 26 Dec 2013 19:30:47 +0000
Subject: [PATCH] Generate version information as part of the build.

Use git (if it's available) to create a major and minor version number
based on the most recent tag name.  If we are not building from a
tagged commit, use the commit count since the last tag as the subminor
version.  If Jenkins is being used for the build, use the build number
as the subsubminor version.
---
 nssm.h      |  4 +---
 nssm.vcproj |  8 ++++++++
 version.cmd | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 3 deletions(-)
 create mode 100644 version.cmd

diff --git a/nssm.h b/nssm.h
index 46308d5..636524d 100644
--- a/nssm.h
+++ b/nssm.h
@@ -21,9 +21,7 @@ void strip_basename(TCHAR *);
 int usage(int);
 
 #define NSSM _T("nssm")
-#define NSSM_VERSION _T("2.21")
-#define NSSM_VERSIONINFO 2,21,0,0
-#define NSSM_DATE _T("2013-11-24")
+#include "version.h"
 
 /*
   Throttle the restart of the service if it stops before this many
diff --git a/nssm.vcproj b/nssm.vcproj
index 803bb43..3b52894 100755
--- a/nssm.vcproj
+++ b/nssm.vcproj
@@ -30,6 +30,8 @@
 			>
 			<Tool
 				Name="VCPreBuildEventTool"
+				Description="Setting version information"
+				CommandLine="version.cmd"
 			/>
 			<Tool
 				Name="VCCustomBuildTool"
@@ -122,6 +124,8 @@
 			>
 			<Tool
 				Name="VCPreBuildEventTool"
+				Description="Setting version information"
+				CommandLine="version.cmd"
 			/>
 			<Tool
 				Name="VCCustomBuildTool"
@@ -215,6 +219,8 @@
 			>
 			<Tool
 				Name="VCPreBuildEventTool"
+				Description="Setting version information"
+				CommandLine="version.cmd"
 			/>
 			<Tool
 				Name="VCCustomBuildTool"
@@ -306,6 +312,8 @@
 			>
 			<Tool
 				Name="VCPreBuildEventTool"
+				Description="Setting version information"
+				CommandLine="version.cmd"
 			/>
 			<Tool
 				Name="VCCustomBuildTool"
diff --git a/version.cmd b/version.cmd
new file mode 100644
index 0000000..536c3e6
--- /dev/null
+++ b/version.cmd
@@ -0,0 +1,33 @@
+@rem Set default version in case git isn't available.
+set description=0.0-0-prerelease
+@rem Get canonical version from git tags, eg v2.21-24-g2c60e53.
+for /f %%v in ('git describe --tags --long') do set description=%%v
+
+@rem Strip leading v if present, eg 2.21-24-g2c60e53.
+set description=%description:v=%
+set version=%description%
+
+@rem Get the number of commits and commit hash, eg 24-g2c60e53.
+set n=%version:*-=%
+set commit=%n:*-=%
+call set n=%%n:%commit%=%%
+set n=%n:~0,-1%
+
+@rem Strip n and commit, eg 2.21.
+call set version=%%version:%n%-%commit%=%%
+set version=%version:~0,-1%
+
+@rem Find major and minor.
+set minor=%version:*.=%
+call set major=%%version:.%minor%=%%
+
+@rem Don't include n and commit if we match a tag exactly.
+if "%n%" == "0" set description=%major%.%minor%
+
+@rem Ignore the build number if this isn't Jenkins.
+if "%BUILD_NUMBER%" == "" set BUILD_NUMBER=0
+
+@rem Create version.h.
+@echo>version.h #define NSSM_VERSION _T("%description%")
+@echo>>version.h #define NSSM_VERSIONINFO %major%,%minor%,%n%,%BUILD_NUMBER%
+@echo>>version.h #define NSSM_DATE _T("%DATE%")
-- 
2.20.1