only run when cmake available

lua/overseer/template/user/cmake/build.lua

@@ -9,4 +9,15 @@ return {
       cwd = 'build_nvim',
     }
   end,
+  condition = {
+    callback = function(opts)
+      if vim.fn.executable("cmake") == 0 then
+        return false, 'Command "cmake" not found'
+      end
+      if vim.fn.findfile("CMakeLists.txt", opts.dir .. ";") == "" then
+        return false, "No CMakeLists.txt found"
+      end
+      return true
+    end,
+  },
 }

lua/overseer/template/user/cmake/clean.lua

@@ -9,4 +9,15 @@ return {
       cwd = 'build_nvim',
     }
   end,
+  condition = {
+    callback = function(opts)
+      if vim.fn.executable("cmake") == 0 then
+        return false, 'Command "cmake" not found'
+      end
+      if vim.fn.findfile("CMakeLists.txt", opts.dir .. ";") == "" then
+        return false, "No CMakeLists.txt found"
+      end
+      return true
+    end,
+  },
 }

lua/overseer/template/user/cmake/cmake.lua

@@ -1,4 +1,5 @@
 return {
+'builtin',
 'user.cmake.configure',
 'user.cmake.build',
 'user.cmake.clean'}

lua/overseer/template/user/cmake/configure.lua

@@ -10,4 +10,15 @@ return {
       cwd = build_nvim,
     }
   end,
+  condition = {
+    callback = function(opts)
+      if vim.fn.executable("cmake") == 0 then
+        return false, 'Command "cmake" not found'
+      end
+      if vim.fn.findfile("CMakeLists.txt", opts.dir .. ";") == "" then
+        return false, "No CMakeLists.txt found"
+      end
+      return true
+    end,
+  },
 }