feat(vim.version): make tostring() return human-readable version range

Problem: `tostring()` applied to version range doesn't return
human-readable text with information about the range.

Solution: Add `__tostring()` method.

runtime/doc/news.txt

@@ -199,6 +199,7 @@ LUA
 • |vim.hl.range()| now allows multiple timed highlights.
 • |vim.tbl_extend()| and |vim.tbl_deep_extend()| now accept a function behavior argument.
 • |vim.fs.root()| can define "equal priority" via nested lists.
+• |vim.version.range()| output can be converted to human-readable string with |tostring()|.
 
 OPTIONS
 

runtime/lua/vim/version.lua

@@ -266,13 +266,23 @@ function VersionRange:has(version)
   return version >= self.from and (self.to == nil or version < self.to)
 end
 
+local range_mt = {
+  __index = VersionRange,
+  __tostring = function(self)
+    if not self.to then
+      return '>=' .. tostring(self.from)
+    end
+    return ('%s - %s'):format(tostring(self.from), tostring(self.to))
+  end,
+}
+
 --- Parses a semver |version-range| "spec" and returns |vim.VersionRange| object:
 --- @since 11
 --- @param spec string Version range "spec"
 --- @return vim.VersionRange?
 function M.range(spec) -- Adapted from https://github.com/folke/lazy.nvim
   if spec == '*' or spec == '' then
-    return setmetatable({ from = M.parse('0.0.0') }, { __index = VersionRange })
+    return setmetatable({ from = M.parse('0.0.0') }, range_mt)
   end
 
   ---@type number?
@@ -286,7 +296,7 @@ function M.range(spec) -- Adapted from https://github.com/folke/lazy.nvim
     return setmetatable({
       from = ra and ra.from,
       to = rb and (#parts == 3 and rb.from or rb.to),
-    }, { __index = VersionRange })
+    }, range_mt)
   end
   ---@type string, string
   local mods, version = spec:lower():match('^([%^=<>~]*)(.*)$')
@@ -332,7 +342,7 @@ function M.range(spec) -- Adapted from https://github.com/folke/lazy.nvim
       end
     end
     ---@diagnostic enable: need-check-nil
-    return setmetatable({ from = from, to = to }, { __index = VersionRange })
+    return setmetatable({ from = from, to = to }, range_mt)
   end
 end
 

test/functional/lua/version_spec.lua

@@ -89,6 +89,11 @@ describe('version', function()
         eq(output, range)
       end)
 
+      it('tostring() ' .. input, function()
+        eq(type(tostring(range)), 'string')
+        eq(vim.version.range(tostring(range)), range)
+      end)
+
       it('[from] in range ' .. input, function()
         assert(range:has(output.from))
       end)
@@ -119,6 +124,9 @@ describe('version', function()
       assert(not vim.version.range('1.2.3-alpha'):has('1.2.3-beta'))
       assert(vim.version.range('>0.10'):has('0.12.0-dev'))
       assert(not vim.version.range('>=0.12'):has('0.12.0-dev'))
+
+      local range_alpha = vim.version.range('1.2.3-alpha')
+      eq(vim.version.range(tostring(range_alpha)), range_alpha)
     end)
 
     it('returns nil with empty version', function()