patch 8.1.1526: no numerical value for the patchlevel

Problem:    No numerical value for the patchlevel.
Solution:   Add v:versionlong.

runtime/doc/eval.txt

@@ -2173,6 +2173,17 @@ v:version	Version number of Vim: Major version number times 100 plus
 		version 5.0 and 5.1 may have a patch 123, but these are
 		completely different.
 
+					*v:versionlong* *versionlong-variable*
+v:versionlong	Like v:version, but also including the patchlevel.  Version
+		8.1 with patch 1234 has value 8011234.  This can be used like
+		this: >
+			if v:versionlong >= 8011234
+<		However, if there are gaps in the list of patches included
+		this will not work well.  This can happen if a recent patch
+		was included into an older version, e.g. for a security fix.
+		Use the has() function to make sure the patch is actually
+		included.
+
 				*v:vim_did_enter* *vim_did_enter-variable*
 v:vim_did_enter	Zero until most of startup is done.  It is set to one just
 		before |VimEnter| autocommands are triggered.

src/eval.c

@@ -196,6 +196,7 @@ static struct vimvar
     {VV_NAME("termstyleresp",	 VAR_STRING), VV_RO},
     {VV_NAME("termblinkresp",	 VAR_STRING), VV_RO},
     {VV_NAME("event",		 VAR_DICT), VV_RO},
+    {VV_NAME("versionlong",	 VAR_NUMBER), VV_RO},
 };
 
 /* shorthand */
@@ -354,6 +355,7 @@ eval_init(void)
 	    hash_add(&compat_hashtab, p->vv_di.di_key);
     }
     vimvars[VV_VERSION].vv_nr = VIM_VERSION_100;
+    vimvars[VV_VERSIONLONG].vv_nr = VIM_VERSION_100 * 10000 + highest_patch();
 
     set_vim_var_nr(VV_SEARCHFORWARD, 1L);
     set_vim_var_nr(VV_HLSEARCH, 1L);

src/testdir/test_eval_stuff.vim

@@ -171,6 +171,9 @@ func Test_vvar_scriptversion2()
   echo version
   call assert_fails('let version = 1', 'E46:')
   call assert_equal(v:version, version)
+
+  call assert_equal(v:version, v:versionlong / 10000)
+  call assert_true(v:versionlong > 8011525)
 endfunc
 
 func Test_scriptversion()

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1526,
 /**/
     1525,
 /**/
@@ -3847,13 +3849,8 @@ static char *(extra_patches[]) =
     int
 highest_patch(void)
 {
-    int		i;
+    // this relies on the highest patch number to be the first entry
-    int		h = 0;
+    return included_patches[0];
-
-    for (i = 0; included_patches[i] != 0; ++i)
-	if (included_patches[i] > h)
-	    h = included_patches[i];
-    return h;
 }
 
 #if defined(FEAT_EVAL) || defined(PROTO)

src/vim.h

@@ -1960,7 +1960,8 @@ typedef int sock_T;
 #define VV_TERMSTYLERESP 85
 #define VV_TERMBLINKRESP 86
 #define VV_EVENT	87
-#define VV_LEN		88	/* number of v: vars */
+#define VV_VERSIONLONG	88
+#define VV_LEN		89	// number of v: vars
 
 /* used for v_number in VAR_SPECIAL */
 #define VVAL_FALSE	0L