fix(startup): don't truncate when printing with -l (#24216)

src/nvim/main.c

@@ -629,6 +629,8 @@ int main(int argc, char **argv)
   }
 
   if (params.luaf != NULL) {
+    // Like "--cmd", "+", "-c" and "-S", don't truncate messages.
+    msg_scroll = true;
     bool lua_ok = nlua_exec_file(params.luaf);
     TIME_MSG("executing Lua -l script");
     getout(lua_ok ? 0 : 1);

test/functional/core/remote_spec.lua

@@ -107,6 +107,7 @@ describe('Remote', function()
       eq({ '0', '' }, run_remote('--remote-expr', 'setline(1, "Yo")'))
       eq({ 'Yo', '' }, run_remote('--remote-expr', 'getline(1)'))
       expect('Yo')
+      eq({ ('k'):rep(1234), '' }, run_remote('--remote-expr', 'repeat("k", 1234)'))
       eq({ '1.25', '' }, run_remote('--remote-expr', '1.25'))
       eq({ 'no', '' }, run_remote('--remote-expr', '0z6E6F'))
       eq({ '\t', '' }, run_remote('--remote-expr', '"\t"'))

test/functional/core/startup_spec.lua

@@ -101,10 +101,11 @@ describe('startup', function()
     it('os.exit() sets Nvim exitcode', function()
       -- tricky: LeakSanitizer triggers on os.exit() and disrupts the return value, disable it
       exec_lua [[
-        local asan_options = os.getenv 'ASAN_OPTIONS'
-        if asan_options ~= nil and asan_options ~= '' then
-          vim.uv.os_setenv('ASAN_OPTIONS', asan_options..':detect_leaks=0')
+        local asan_options = os.getenv('ASAN_OPTIONS') or ''
+        if asan_options ~= '' then
+          asan_options = asan_options .. ':'
         end
+        vim.uv.os_setenv('ASAN_OPTIONS', asan_options .. ':detect_leaks=0')
       ]]
       -- nvim -l foo.lua -arg1 -- a b c
       assert_l_out([[
@@ -143,6 +144,14 @@ describe('startup', function()
       eq(0, eval('v:shell_error'))
     end)
 
+    it('does not truncate long print() message', function()
+      assert_l_out(('k'):rep(1234),
+        nil,
+        nil,
+        '-',
+        "print(('k'):rep(1234))")
+    end)
+
     it('sets _G.arg', function()
       -- nvim -l foo.lua
       assert_l_out([[
@@ -219,6 +228,15 @@ describe('startup', function()
     end)
   end)
 
+  it('--cmd/-c/+ do not truncate long Lua print() message with --headless', function()
+    local out = funcs.system({ nvim_prog, '-u', 'NONE', '-i', 'NONE', '--headless',
+                               '--cmd', 'lua print(("A"):rep(1234))',
+                               '-c', 'lua print(("B"):rep(1234))',
+                               '+lua print(("C"):rep(1234))',
+                               '+q' })
+    eq(('A'):rep(1234) .. '\r\n' .. ('B'):rep(1234) .. '\r\n' .. ('C'):rep(1234), out)
+  end)
+
   it('pipe at both ends: has("ttyin")==0 has("ttyout")==0', function()
     -- system() puts a pipe at both ends.
     local out = funcs.system({ nvim_prog, '-u', 'NONE', '-i', 'NONE', '--headless',