feat(version): support multiple Vim versions

Group up to 15 vimpatch numbers in 1 line to guard against
'make formatc'.
1-liner for vim_versions, num_patches.

Automate '*Version' to remove version.h macros.

'-V1 -v' lists merged Vim versions.

scripts/vimpatch.lua

@@ -19,58 +19,105 @@ local function vimpatch_sh_list_tokens()
   return systemlist({ { 'bash', '-c', 'scripts/vim-patch.sh -M' } })
 end
 
--- Generates the lines to be inserted into the src/nvim/version.c
--- `included_patches[]` definition.
+-- Generate the data,lines to update src/nvim/version.c.
+-- - `vim_versions[]`
+-- - `Versions[]`
+-- - `num_patches[]`
+-- - `included_patchsets[]`
 local function gen_version_c_lines()
-  -- Sets of merged Vim x.y.zzzz patch numbers.
-  local merged_patch_sets = {}
+  -- List of version sets where each set contains:
+  -- 1. major_minor_version (int)
+  -- 2. major_minor_version (string)
+  -- 3. set of merged patch numbers
+  local merged_version_list = {}
   for _, token in ipairs(vimpatch_sh_list_tokens()) do
     local major_version, minor_version, patch_num = string.match(token, '^(%d+).(%d+).(%d+)$')
     local n = tonumber(patch_num)
-    -- TODO(@janlazo): Allow multiple Vim versions
-    -- if n then
-    if n and major_version == '8' and minor_version == '1' then
+    if n then
       local major_minor_version = major_version * 100 + minor_version
-      merged_patch_sets[major_minor_version] = merged_patch_sets[major_minor_version] or {}
-      table.insert(merged_patch_sets[major_minor_version], n)
-    end
-  end
-
-  local sorted_versions = {}
-  for k, _ in pairs(merged_patch_sets) do
-    table.insert(sorted_versions, k)
-  end
-  table.sort(sorted_versions)
-  local lines = {}
-  for _, major_minor_version in ipairs(sorted_versions) do
-    -- table.insert(lines, string.format('  // major minor version: %s', major_minor_version))
-    local patch_set = merged_patch_sets[major_minor_version]
-    for i = #patch_set, 1, -1 do
-      local patch = patch_set[i]
-      table.insert(lines, string.format('  %s,', patch))
-      if patch > 0 then
-        local oldest_unmerged_patch = patch_set[i - 1] and (patch_set[i - 1] + 1) or 0
-        for unmerged_patch = patch -1, oldest_unmerged_patch, -1 do
-          table.insert(lines, string.format('  // %s,', unmerged_patch))
-        end
+      local len = #merged_version_list
+      if len == 0 or merged_version_list[len][1] ~= major_minor_version then
+        local vstr = '"' .. major_version .. '.' .. minor_version .. '"'
+        table.insert(merged_version_list, { major_minor_version, vstr, { n } })
+      else
+        table.insert(merged_version_list[len][3], n)
       end
     end
   end
 
-  return lines
+  local major_vim_versions = {}
+  local major_vim_versions_str = {}
+  local num_patches = {}
+  local patch_lines = {}
+  for _, version_set in ipairs(merged_version_list) do
+    local major_minor_version, major_minor_version_str, patch_set = unpack(version_set)
+    table.insert(major_vim_versions, major_minor_version)
+    table.insert(major_vim_versions_str, major_minor_version_str)
+    table.insert(num_patches, #patch_set)
+    table.insert(patch_lines, '  (const int[]) {  // ' .. major_minor_version)
+
+    local patchset_set = {}
+    for i = #patch_set, 1, -1 do
+      local patch = patch_set[i]
+      local next_patch = patch_set[i - 1]
+      local patch_diff = patch - (next_patch or 0)
+      table.insert(patchset_set, patch)
+
+      -- guard against last patch or `make formatc`
+      if #patchset_set > 15 or i == 1 or patch_diff > 1 then
+        table.insert(patch_lines, '    ' .. table.concat(patchset_set, ', ') .. ',')
+        patchset_set = {}
+      end
+      if i == 1 and patch > 0 then
+        local line = '    // 0'
+        if patch > 1 then
+          line = line .. '-' .. (patch - 1)
+        end
+        table.insert(patch_lines, line)
+      elseif patch_diff > 1 then
+        local line = '    // ' .. (next_patch + 1)
+        if patch_diff > 2 then
+          line = line .. '-' .. (patch - 1)
+        end
+        table.insert(patch_lines, line)
+      end
+    end
+
+    table.insert(patch_lines, '  },')
+  end
+
+  return major_vim_versions, major_vim_versions_str, num_patches, patch_lines
 end
 
 local function patch_version_c()
-  local lines = gen_version_c_lines()
+  local major_vim_versions, major_vim_versions_str, num_patches, patch_lines = gen_version_c_lines()
 
   nvim.nvim_command('silent noswapfile noautocmd edit src/nvim/version.c')
-  nvim.nvim_command('/static const int included_patches')
+  nvim.nvim_command([[/^char \*Versions]])
+  -- Replace the line.
+  nvim.nvim_call_function('setline', {
+    nvim.nvim_eval('line(".")'),
+    'char *Versions[] = { ' .. table.concat(major_vim_versions_str, ', ') .. ' };',
+  })
+  nvim.nvim_command([[/^static const int vim_versions]])
+  -- Replace the line.
+  nvim.nvim_call_function('setline', {
+    nvim.nvim_eval('line(".")'),
+    'static const int vim_versions[] = { ' .. table.concat(major_vim_versions, ', ') .. ' };',
+  })
+  nvim.nvim_command([[/^static const int num_patches]])
+  -- Replace the line.
+  nvim.nvim_call_function('setline', {
+    nvim.nvim_eval('line(".")'),
+    'static const int num_patches[] = { ' .. table.concat(num_patches, ', ') .. ' };',
+  })
+  nvim.nvim_command([[/^static const int \*included_patchsets]])
   -- Delete the existing lines.
   nvim.nvim_command('silent normal! j0d/};\rk')
   -- Insert the lines.
   nvim.nvim_call_function('append', {
     nvim.nvim_eval('line(".")'),
-    lines,
+    patch_lines,
   })
   nvim.nvim_command('silent write')
 end

src/nvim/buffer.c

@@ -3800,14 +3800,15 @@ static int chk_modeline(linenr_T lnum, int flags)
           continue;
         }
 
+        const int vim_version = min_vim_version();
         if (*e == ':'
             && (s[0] != 'V'
                 || strncmp(skipwhite(e + 1), "set", 3) == 0)
             && (s[3] == ':'
-                || (VIM_VERSION_100 >= vers && isdigit((uint8_t)s[3]))
-                || (VIM_VERSION_100 < vers && s[3] == '<')
-                || (VIM_VERSION_100 > vers && s[3] == '>')
-                || (VIM_VERSION_100 == vers && s[3] == '='))) {
+                || (vim_version >= vers && isdigit((uint8_t)s[3]))
+                || (vim_version < vers && s[3] == '<')
+                || (vim_version > vers && s[3] == '>')
+                || (vim_version == vers && s[3] == '='))) {
           break;
         }
       }

src/nvim/eval/funcs.c

@@ -2812,14 +2812,10 @@ static void f_has(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
           int minor = atoi(end + 1);
 
           // Expect "patch-9.9.01234".
-          n = (major < VIM_VERSION_MAJOR
-               || (major == VIM_VERSION_MAJOR
-                   && (minor < VIM_VERSION_MINOR
-                       || (minor == VIM_VERSION_MINOR
-                           && has_vim_patch(atoi(end + 3))))));
+          n = has_vim_patch(atoi(end + 3), major * 100 + minor);
         }
       } else if (ascii_isdigit(name[5])) {
-        n = has_vim_patch(atoi(name + 5));
+        n = has_vim_patch(atoi(name + 5), 0);
       }
     } else if (STRNICMP(name, "nvim-", 5) == 0) {
       // Expect "nvim-x.y.z"

src/nvim/eval/vars.c

@@ -281,8 +281,9 @@ void evalvars_init(void)
       hash_add(&compat_hashtab, p->vv_di.di_key);
     }
   }
-  set_vim_var_nr(VV_VERSION, VIM_VERSION_100);
-  set_vim_var_nr(VV_VERSIONLONG, VIM_VERSION_100 * 10000 + highest_patch());
+  const int vim_version = min_vim_version();
+  set_vim_var_nr(VV_VERSION, vim_version);
+  set_vim_var_nr(VV_VERSIONLONG, vim_version * 10000 + highest_patch());
 
   dict_T *const msgpack_types_dict = tv_dict_alloc();
   for (size_t i = 0; i < ARRAY_SIZE(msgpack_type_names); i++) {

src/nvim/memline.c

@@ -330,7 +330,7 @@ int ml_open(buf_T *buf)
   b0p->b0_magic_int = B0_MAGIC_INT;
   b0p->b0_magic_short = (int16_t)B0_MAGIC_SHORT;
   b0p->b0_magic_char = B0_MAGIC_CHAR;
-  xstrlcpy(xstpcpy(b0p->b0_version, "VIM "), Version, 6);
+  xstrlcpy(xstpcpy(b0p->b0_version, "VIM "), Versions[0], 6);
   long_to_char((long)mfp->mf_page_size, b0p->b0_page_size);
 
   if (!buf->b_spell) {

src/nvim/version.h

@@ -5,26 +5,10 @@
 #include "nvim/macros_defs.h"
 
 // defined in version.c
-extern char *Version;
+extern char *Versions[];
 extern char *longVersion;
 #ifndef NDEBUG
 extern char *version_cflags;
 #endif
 
-//
-// Vim version number, name, etc. Patchlevel is defined in version.c.
-//
-
-// Values that change for a new release
-#define VIM_VERSION_MAJOR                8
-#define VIM_VERSION_MINOR                1
-
-// Values based on the above
-#define VIM_VERSION_MAJOR_STR STR(VIM_VERSION_MAJOR)
-#define VIM_VERSION_MINOR_STR STR(VIM_VERSION_MINOR)
-#define VIM_VERSION_100     (VIM_VERSION_MAJOR * 100 + VIM_VERSION_MINOR)
-
-// swap file compatibility (max. length is 6 chars)
-#define VIM_VERSION_SHORT VIM_VERSION_MAJOR_STR "." VIM_VERSION_MINOR_STR
-
 #include "version.h.generated.h"

test/functional/vimscript/has_spec.lua

@@ -104,4 +104,39 @@ describe('has()', function()
     fn.has('python3') -- use a call whose implementation shells out
     eq(73, fn.eval('v:shell_error'))
   end)
+
+  it('"patch[0-9]\\+"', function()
+    eq(1, fn.has('patch0'))
+    eq(1, fn.has('patch1'))
+  end)
+
+  it('"patch-x.y.z"', function()
+    -- versions older than current v:version always succeed
+    -- unless minor version has 2+ digits
+    eq(1, fn.has('patch-7.4.0'))
+    eq(0, fn.has('patch-7.40.0'))
+    eq(1, fn.has('patch-8.0.0'))
+    eq(0, fn.has('patch-8.00.0'))
+
+    eq(1, fn.has('patch-8.1.0'))
+    eq(1, fn.has('patch-8.1.1'))
+    eq(1, fn.has('patch-8.1.0001'))
+    eq(1, fn.has('patch-8.1.1939'))
+    eq(1, fn.has('patch-8.1.2424'))
+
+    eq(0, fn.has('patch-8.2.0'))
+    eq(1, fn.has('patch-8.2.1'))
+    eq(1, fn.has('patch-8.2.2999'))
+    eq(1, fn.has('patch-8.2.5171'))
+
+    eq(0, fn.has('patch-9.0.0'))
+    eq(1, fn.has('patch-9.0.1'))
+    eq(1, fn.has('patch-9.0.998'))
+    eq(1, fn.has('patch-9.0.2190'))
+
+    eq(0, fn.has('patch-9.1.0'))
+    eq(1, fn.has('patch-9.1.1'))
+    eq(1, fn.has('patch-9.1.690'))
+    eq(1, fn.has('patch-9.1.1934'))
+  end)
 end)