feat: add restore diagnostics command for previous code reviews

README.md

@@ -48,6 +48,7 @@ Run `:checkhealth coderabbit` to verify everything is wired up.
 | `:CodeRabbitStop` | Cancel a running review |
 | `:CodeRabbitClear` | Clear diagnostics |
 | `:CodeRabbitShow [id]` | View results (float or buffer). Defaults to the latest review |
+| `:CodeRabbitRestore [id]` | Reapply diagnostics from a saved review. Defaults to the most recent |
 | `:CodeRabbitHistory` | Browse past reviews |
 
 For your statusline:

doc/coderabbit.txt

@@ -107,6 +107,11 @@ COMMANDS                                                  *coderabbit-commands*
     Pass an `id` from `:CodeRabbitHistory` to view a saved review.
     Press `q` to close.
 
+:CodeRabbitRestore [id]                                  *:CodeRabbitRestore*
+    Reapply diagnostics from a saved review. Pass an `id` from
+    `:CodeRabbitHistory` to restore a specific review. Without an `id`,
+    restores the most recent review.
+
 :CodeRabbitHistory                                       *:CodeRabbitHistory*
     Browse saved reviews via |vim.ui.select|.
 
@@ -128,6 +133,9 @@ require("coderabbit").clear()                             *coderabbit.clear()*
 require("coderabbit").show({id})                           *coderabbit.show()*
     Open the review buffer. `nil` = current, number = saved.
 
+require("coderabbit").restore({id})                     *coderabbit.restore()*
+    Reapply diagnostics from a saved review. `nil` = most recent.
+
 require("coderabbit").history()                         *coderabbit.history()*
     Open the review history picker.
 

lua/coderabbit/init.lua

@@ -20,6 +20,10 @@ function M.clear()
   require("coderabbit.review").clear()
 end
 
+function M.restore(id)
+  require("coderabbit.review").restore(id)
+end
+
 function M.show(id)
   require("coderabbit.show").open(id)
 end

lua/coderabbit/review.lua

@@ -229,6 +229,36 @@ function M.stop()
   end
 end
 
+function M.restore(id)
+  local entries = storage.list()
+  if #entries == 0 then
+    vim.notify("CodeRabbit: No saved reviews found", vim.log.levels.WARN)
+    return
+  end
+
+  if not id then
+    id = entries[#entries].id
+  end
+
+  local review = storage.load(id)
+  if not review then
+    vim.notify("CodeRabbit: Review #" .. id .. " not found", vim.log.levels.WARN)
+    return
+  end
+
+  diagnostics.clear()
+  vim.schedule(function()
+    for _, finding in ipairs(review.findings) do
+      diagnostics.set(finding.filepath, { finding.diagnostic })
+    end
+
+    vim.notify(
+      string.format("CodeRabbit: Restored %d findings from review #%d", #review.findings, id),
+      vim.log.levels.INFO
+    )
+  end)
+end
+
 function M.clear()
   diagnostics.clear()
   state.findings = {}

plugin/coderabbit.lua

@@ -48,6 +48,18 @@ end, {
   desc = "Show CodeRabbit review results in a buffer (optional: review ID)",
 })
 
+vim.api.nvim_create_user_command("CodeRabbitRestore", function(args)
+  ensure_setup()
+  local id = args.fargs[1] and tonumber(args.fargs[1]) or nil
+  require("coderabbit").restore(id)
+end, {
+  nargs = "?",
+  complete = function()
+    return require("coderabbit.storage").ids()
+  end,
+  desc = "Restore diagnostics from a previous CodeRabbit review (default: most recent)",
+})
+
 vim.api.nvim_create_user_command("CodeRabbitHistory", function()
   ensure_setup()
   require("coderabbit").history()

tests/coderabbit/restore_spec.lua

@@ -0,0 +1,107 @@
+local diagnostics = require("coderabbit.diagnostics")
+local review = require("coderabbit.review")
+local storage = require("coderabbit.storage")
+local h = require("tests.helpers")
+local test, eq = h.test, h.eq
+
+local test_dir = vim.fn.tempname() .. "/coderabbit_restore_test"
+storage._set_base_dir(test_dir)
+
+local function flush()
+  vim.wait(10, function()
+    return false
+  end)
+end
+
+local function cleanup()
+  vim.fn.delete(test_dir, "rf")
+  diagnostics.clear()
+end
+
+local function make_findings(n)
+  local tmpdir = vim.fn.tempname()
+  vim.fn.mkdir(tmpdir, "p")
+  local findings = {}
+  for i = 1, n do
+    local filepath = tmpdir .. "/file" .. i .. ".ts"
+    vim.fn.writefile({ "// mock" }, filepath)
+    table.insert(findings, h.finding(filepath, i * 10, h.W, "finding " .. i))
+  end
+  return findings
+end
+
+-- ──────────────────────────────────────────────────────────
+-- Tests
+-- ──────────────────────────────────────────────────────────
+
+test("restore: warns when no saved reviews exist", function()
+  cleanup()
+  -- Should not error, just warn
+  review.restore(nil)
+end)
+
+test("restore: warns when review ID not found", function()
+  cleanup()
+  storage.save(make_findings(1), h.context())
+  review.restore(999)
+end)
+
+test("restore: restores diagnostics from a specific review", function()
+  cleanup()
+  local findings = make_findings(2)
+  storage.save(findings, h.context())
+
+  review.restore(1)
+  flush()
+
+  for _, finding in ipairs(findings) do
+    local bufnr = vim.fn.bufnr(finding.filepath)
+    local got = vim.diagnostic.get(bufnr, { namespace = diagnostics.ns })
+    eq(#got, 1)
+    eq(got[1].message, finding.diagnostic.message)
+  end
+end)
+
+test("restore: defaults to most recent review when no ID given", function()
+  cleanup()
+  local old_findings = make_findings(1)
+  storage.save(old_findings, h.context("old-branch"))
+  local new_findings = make_findings(2)
+  storage.save(new_findings, h.context("new-branch"))
+
+  review.restore(nil)
+  flush()
+
+  -- Should have diagnostics from the second review (2 findings)
+  local total = 0
+  for _, d in ipairs(vim.diagnostic.get()) do
+    if d.source == "coderabbit" then
+      total = total + 1
+    end
+  end
+  eq(total, 2)
+end)
+
+test("restore: clears previous diagnostics before applying", function()
+  cleanup()
+  local first = make_findings(3)
+  storage.save(first, h.context())
+  local second = make_findings(1)
+  storage.save(second, h.context())
+
+  review.restore(1) -- 3 findings
+  flush()
+  review.restore(2) -- 1 finding — should replace, not accumulate
+  flush()
+
+  local total = 0
+  for _, d in ipairs(vim.diagnostic.get()) do
+    if d.source == "coderabbit" then
+      total = total + 1
+    end
+  end
+  eq(total, 1)
+end)
+
+cleanup()
+h.summary()