add auto detect vs version

xmake/plugins/project/main.lua

@@ -21,6 +21,7 @@
 -- imports
 import("core.base.option")
 import("core.base.task")
+import("core.project.config")
 import("core.platform.environment")
 import("make.makefile")
 import("cmake.cmakelists")
@@ -30,6 +31,22 @@ import("vsxmake.vsxmake")
 import("clang.compile_flags")
 import("clang.compile_commands")
 
+function _vs(outputdir)
+    local vsver = assert(tonumber(config.get("vs")), "invalid vs version, run `xmake f --vs=2015`")
+    vprint("using project kind vs%d", vsver)
+    if vsver < 2010 then
+        return vs.make(vsver)(outputdir)
+    else
+        return vsx.make(vsver)(outputdir)
+    end
+end
+
+function _vsxmake(outputdir)
+    local vsver = assert(tonumber(config.get("vs")), "invalid vs version, run `xmake f --vs=2015`")
+    vprint("using project kind vsxmake%d", vsver)
+    return vsxmake.make(vsver)(outputdir)
+end
+
 -- make project
 function _make(kind)
 
@@ -48,17 +65,19 @@ function _make(kind)
     ,   vs2015           = vsx.make(2015)
     ,   vs2017           = vsx.make(2017)
     ,   vs2019           = vsx.make(2019)
+    ,   vs               = _vs
     ,   vsxmake2010      = vsxmake.make(2010)
     ,   vsxmake2012      = vsxmake.make(2012)
     ,   vsxmake2013      = vsxmake.make(2013)
     ,   vsxmake2015      = vsxmake.make(2015)
     ,   vsxmake2017      = vsxmake.make(2017)
     ,   vsxmake2019      = vsxmake.make(2019)
+    ,   vsxmake          = _vsxmake
     ,   compile_flags    = compile_flags.make
     ,   compile_commands = compile_commands.make
     }
     assert(maps[kind], "the project kind(%s) is not supported!", kind)
-    
+
     -- make it
     maps[kind](option.get("outputdir"))
 end

xmake/plugins/project/vstudio/impl/vsinfo.lua

@@ -89,5 +89,5 @@ local vsinfo =
 
 function main(version)
     assert(version)
-    return assert(vsinfo[version]);
+    return assert(vsinfo[version], "unsupported vs version (%d)", version);
 end

xmake/plugins/project/vsxmake/vsxmake.lua

@@ -129,6 +129,11 @@ end
 -- make
 function make(version)
 
+    -- check
+    if version < 2010 then
+        raise("vsxmake does not support vs version lower than 2010")
+    end
+
     return function(outputdir)
         local info = getinfo(outputdir, vsinfo(version))
         local paramsprovidersln = _buildparams(info)