refactor(health): refactor provider healthchecks

* Prefer pure Lua functions over vim.fn
* Split up provider healthchecks into separate modules to help manage
  complexity

1 files changed, 40 insertions, 0 deletions

diff --git a/runtime/lua/provider/clipboard/health.lua b/runtime/lua/provider/clipboard/health.lua
new file mode 100644
index 0000000000..dc33cb0ab0
--- /dev/null
+++ b/runtime/lua/provider/clipboard/health.lua
@@ -0,0 +1,40 @@
+local health = vim.health
+local executable = health.executable
+
+local M = {}
+
+function M.check()
+  health.start('Clipboard (optional)')
+
+  if
+    os.getenv('TMUX')
+    and executable('tmux')
+    and executable('pbpaste')
+    and not health.cmd_ok('pbpaste')
+  then
+    local tmux_version = string.match(vim.fn.system('tmux -V'), '%d+%.%d+')
+    local advice = {
+      'Install tmux 2.6+.  https://superuser.com/q/231130',
+      'or use tmux with reattach-to-user-namespace.  https://superuser.com/a/413233',
+    }
+    health.error('pbcopy does not work with tmux version: ' .. tmux_version, advice)
+  end
+
+  local clipboard_tool = vim.fn['provider#clipboard#Executable']()
+  if vim.g.clipboard ~= nil and clipboard_tool == '' then
+    local error_message = vim.fn['provider#clipboard#Error']()
+    health.error(
+      error_message,
+      "Use the example in :help g:clipboard as a template, or don't set g:clipboard at all."
+    )
+  elseif clipboard_tool:find('^%s*$') then
+    health.warn(
+      'No clipboard tool found. Clipboard registers (`"+` and `"*`) will not work.',
+      ':help clipboard'
+    )
+  else
+    health.ok('Clipboard tool found: ' .. clipboard_tool)
+  end
+end
+
+return M