feat(diagnostics): add diagnostics.severity (#1755)

* feat: Support diagnostics severity

* fix: Revert Hunk

* feat: Supports min/max severity

* feat: Supports min/max severity: tidy doc

* feat: Supports min/max severity: tidy doc

* feat: Supports min/max severity: tidy doc

Co-authored-by: Alexander Courtis <alex@courtis.org>

doc/nvim-tree-lua.txt

@@ -291,6 +291,10 @@ Subsequent calls to setup will replace the previous configuration.
         enable = false,
         show_on_dirs = false,
         debounce_delay = 50,
+        severity = {
+          min = vim.diagnostic.severity.HINT,
+          max = vim.diagnostic.severity.ERROR
+        },
         icons = {
           hint = "",
           info = "",
@@ -365,6 +369,9 @@ Subsequent calls to setup will replace the previous configuration.
           ignore = {},
         },
       },
+      notify = {
+        threshold = vim.log.levels.INFO,
+      },
       log = {
         enable = false,
         truncate = false,
@@ -379,9 +386,6 @@ Subsequent calls to setup will replace the previous configuration.
           watcher = false,
         },
       },
-      notify = {
-        threshold = vim.log.levels.INFO,
-      },
     } -- END_DEFAULT_OPTS
 <
 
@@ -532,6 +536,13 @@ Configuration options for the system open command.
 *nvim-tree.diagnostics*
 Show LSP and COC diagnostics in the signcolumn
 
+    `NOTE`: it will use the default diagnostic color groups to highlight the signs.
+    If you wish to customize, you can override these groups:
+    - `NvimTreeLspDiagnosticsError`
+    - `NvimTreeLspDiagnosticsWarning`
+    - `NvimTreeLspDiagnosticsInformation`
+    - `NvimTreeLspDiagnosticsHint`
+
     *nvim-tree.diagnostics.enable*
     Enable/disable the feature.
       Type: `boolean`, Default: `false`
@@ -548,12 +559,16 @@ Show LSP and COC diagnostics in the signcolumn
     Icons for diagnostic severity.
       Type: `table`, Default: `{ hint = "", info = "", warning = "", error = "" }`
 
-    `NOTE`: it will use the default diagnostic color groups to highlight the signs.
-    If you wish to customize, you can override these groups:
-    - `NvimTreeLspDiagnosticsError`
-    - `NvimTreeLspDiagnosticsWarning`
-    - `NvimTreeLspDiagnosticsInformation`
-    - `NvimTreeLspDiagnosticsHint`
+    *nvim-tree.diagnostics.severity*
+    Severity for which the diagnostics will be displayed. See |diagnostic-severity|
+
+      *nvim-tree.diagnostics.severity.min*
+      Minimum severity.
+        Type: |vim.diagnostic.severity|, Default: `vim.diagnostic.severity.HINT`
+
+      *nvim-tree.diagnostics.severity.max*
+      Maximum severity.
+        Type: |vim.diagnostic.severity|, Default: `vim.diagnostic.severity.ERROR`
 
 *nvim-tree.git*
 Git integration with icons and colors.

lua/nvim-tree.lua

@@ -569,6 +569,10 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
     enable = false,
     show_on_dirs = false,
     debounce_delay = 50,
+    severity = {
+      min = vim.diagnostic.severity.HINT,
+      max = vim.diagnostic.severity.ERROR,
+    },
     icons = {
       hint = "",
       info = "",

lua/nvim-tree/diagnostics.lua

@@ -27,7 +27,7 @@ end
 local function from_nvim_lsp()
   local buffer_severity = {}
 
-  for _, diagnostic in ipairs(vim.diagnostic.get()) do
+  for _, diagnostic in ipairs(vim.diagnostic.get(nil, { severity = M.severity })) do
     local buf = diagnostic.bufnr
     if vim.api.nvim_buf_is_valid(buf) then
       local bufname = vim.api.nvim_buf_get_name(buf)
@@ -140,6 +140,7 @@ local links = {
 function M.setup(opts)
   M.enable = opts.diagnostics.enable
   M.debounce_delay = opts.diagnostics.debounce_delay
+  M.severity = opts.diagnostics.severity
 
   if M.enable then
     log.line("diagnostics", "setup")