fix!: Require NeoVim 0.8+

Although nvim-treesitter is technically an optional dependency, tests will
not run to completion on 0.7 because nvim-treesitter no longer supports
it. So we've decided to remove support for NeoVim 0.7 to remove the
maintenance overhead and complexity of supporting only non-treesitter
behaviour for 0.7.

Author: Andrew Ferrier

.github/workflows/unittest.yaml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        neovim_branch: ['v0.7.2', 'v0.8.0', 'nightly']
+        neovim_branch: ['v0.8.0', 'nightly']
     runs-on: ubuntu-latest
 
     steps:

README.md

@@ -77,7 +77,7 @@ It provides various improvements:
 
 ## Installation
 
-**Requires NeoVim 0.7+.**
+**Requires NeoVim 0.8+.**
 
 Optional dependency:
 [nvim-treesitter](https://github.com/nvim-treesitter/nvim-treesitter). If this

lua/debugprint/init.lua

@@ -379,4 +379,13 @@ M.add_custom_filetypes = function(filetypes)
         vim.tbl_deep_extend("force", global_opts.filetypes, filetypes)
 end
 
+if vim.fn.has("nvim-0.8.0") ~= 1 then
+    vim.notify(
+        "WARNING: debugprint.nvim is only compatible with NeoVim 0.8+",
+        vim.log.levels.WARN
+    )
+
+    return
+end
+
 return M