fix(formatter): format multi-line question answer (#292)

Author: disrupted

lua/opencode/ui/formatter.lua

@@ -647,7 +647,13 @@ function M._format_question_tool(output, input, metadata, status, duration_text)
       output:add_line(string.format('**Q%d:** %s', i, question_lines[1]))
     end
     local answer = answers[i] and answers[i][1] or 'No answer'
-    output:add_line(string.format('**A%d:** %s', i, answer))
+    local answer_lines = vim.split(answer, '\n', { plain = true })
+
+    output:add_line(string.format('**A%d:** %s', i, answer_lines[1]))
+    for line_idx = 2, #answer_lines do
+      output:add_line(answer_lines[line_idx])
+    end
+
     if i < #questions then
       output:add_line('')
     end

tests/unit/formatter_spec.lua

@@ -0,0 +1,61 @@
+local assert = require('luassert')
+local config = require('opencode.config')
+local formatter = require('opencode.ui.formatter')
+
+describe('formatter', function()
+  before_each(function()
+    config.setup({
+      ui = {
+        output = {
+          tools = {
+            show_output = true,
+          },
+        },
+      },
+    })
+  end)
+
+  it('formats multiline question answers', function()
+    local message = {
+      info = {
+        id = 'msg_1',
+        role = 'assistant',
+        sessionID = 'ses_1',
+      },
+      parts = {},
+    }
+
+    local part = {
+      id = 'prt_1',
+      type = 'tool',
+      tool = 'question',
+      messageID = 'msg_1',
+      sessionID = 'ses_1',
+      state = {
+        status = 'completed',
+        input = {
+          questions = {
+            {
+              question = 'What should we do?',
+              header = 'Question',
+              options = {},
+            },
+          },
+        },
+        metadata = {
+          answers = {
+            { 'First line\nSecond line' },
+          },
+        },
+        time = {
+          start = 1,
+          ['end'] = 2,
+        },
+      },
+    }
+
+    local output = formatter.format_part(part, message, true)
+    assert.are.equal('**A1:** First line', output.lines[4])
+    assert.are.equal('Second line', output.lines[5])
+  end)
+end)