feat(version): unverbose ":version", ":verbose version" #24195

Problem:
`nvim -v` and `:version` prints system vimrc, fallback files, and compilation
info by default, which most people don't care about and just clutters up the
output.

Solution:
Omit extra info unless 'verbose' is set.

3 files changed, 43 insertions, 20 deletions

diff --git a/cmake/RunTests.cmake b/cmake/RunTests.cmake
index e1a0c8d6c3..5e83b72235 100644
--- a/cmake/RunTests.cmake
+++ b/cmake/RunTests.cmake
@@ -66,6 +66,8 @@ set(ENV{SYSTEM_NAME} ${CMAKE_HOST_SYSTEM_NAME})  # used by test/helpers.lua.
 set(ENV{DEPS_INSTALL_DIR} ${DEPS_INSTALL_DIR})  # used by test/busted_runner.lua
 
 execute_process(
+  # Note: because of "-ll" (low-level interpreter mode), some modules like
+  # _editor.lua are not loaded.
   COMMAND ${NVIM_PRG} -ll ${WORKING_DIR}/test/busted_runner.lua -v -o test.busted.outputHandlers.${BUSTED_OUTPUT_TYPE}
     --lazy --helper=${TEST_DIR}/${TEST_TYPE}/preload.lua
     --lpath=${BUILD_DIR}/?.lua
diff --git a/src/nvim/version.c b/src/nvim/version.c
index b9fa7799a6..95e275bceb 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -2700,33 +2700,39 @@ void list_version(void)
   msg(longVersion);
   msg(version_buildtype);
   list_lua_version();
+
+  if (p_verbose > 0) {
 #ifndef NDEBUG
-  msg(version_cflags);
+    msg(version_cflags);
 #endif
-
-  version_msg("\n\n");
+    version_msg("\n\n");
 
 #ifdef SYS_VIMRC_FILE
-  version_msg(_("   system vimrc file: \""));
-  version_msg(SYS_VIMRC_FILE);
-  version_msg("\"\n");
-#endif  // ifdef SYS_VIMRC_FILE
-#ifdef HAVE_PATHDEF
-
-  if (*default_vim_dir != NUL) {
-    version_msg(_("  fall-back for $VIM: \""));
-    version_msg(default_vim_dir);
+    version_msg(_("   system vimrc file: \""));
+    version_msg(SYS_VIMRC_FILE);
     version_msg("\"\n");
-  }
+#endif
 
-  if (*default_vimruntime_dir != NUL) {
-    version_msg(_(" f-b for $VIMRUNTIME: \""));
-    version_msg(default_vimruntime_dir);
-    version_msg("\"\n");
+#ifdef HAVE_PATHDEF
+    if (*default_vim_dir != NUL) {
+      version_msg(_("  fall-back for $VIM: \""));
+      version_msg(default_vim_dir);
+      version_msg("\"\n");
+    }
+
+    if (*default_vimruntime_dir != NUL) {
+      version_msg(_(" f-b for $VIMRUNTIME: \""));
+      version_msg(default_vimruntime_dir);
+      version_msg("\"\n");
+    }
+#endif
   }
-#endif  // ifdef HAVE_PATHDEF
 
-  version_msg("\nRun :checkhealth for more info");
+  version_msg(p_verbose > 0
+              ? "\nRun :checkhealth for more info"
+              : (starting
+                 ? "\nRun \"nvim -V1 -v\" for more info"
+                 : "\nRun \":verbose version\" for more info"));
 }
 
 /// Show the intro message when not editing a file.
diff --git a/test/functional/core/main_spec.lua b/test/functional/core/main_spec.lua
index efab40dd11..19c7a93730 100644
--- a/test/functional/core/main_spec.lua
+++ b/test/functional/core/main_spec.lua
@@ -3,6 +3,7 @@ local helpers = require('test.functional.helpers')(after_each)
 local Screen = require('test.functional.ui.screen')
 
 local eq = helpers.eq
+local matches = helpers.matches
 local feed = helpers.feed
 local eval = helpers.eval
 local clear = helpers.clear
@@ -12,21 +13,24 @@ local write_file = helpers.write_file
 local is_os = helpers.is_os
 local skip = helpers.skip
 
-describe('Command-line option', function()
+describe('command-line option', function()
   describe('-s', function()
     local fname = 'Xtest-functional-core-main-s'
     local fname_2 = fname .. '.2'
     local nonexistent_fname = fname .. '.nonexistent'
     local dollar_fname = '$' .. fname
+
     before_each(function()
       clear()
       os.remove(fname)
       os.remove(dollar_fname)
     end)
+
     after_each(function()
       os.remove(fname)
       os.remove(dollar_fname)
     end)
+
     it('treats - as stdin', function()
       eq(nil, luv.fs_stat(fname))
       funcs.system(
@@ -38,6 +42,7 @@ describe('Command-line option', function()
       local attrs = luv.fs_stat(fname)
       eq(#('42\n'), attrs.size)
     end)
+
     it('does not expand $VAR', function()
       eq(nil, luv.fs_stat(fname))
       eq(true, not not dollar_fname:find('%$%w+'))
@@ -50,6 +55,7 @@ describe('Command-line option', function()
       local attrs = luv.fs_stat(fname)
       eq(#('100500\n'), attrs.size)
     end)
+
     it('does not crash after reading from stdin in non-headless mode', function()
       skip(is_os('win'))
       local screen = Screen.new(40, 8)
@@ -100,6 +106,7 @@ describe('Command-line option', function()
       ]])
       ]=]
     end)
+
     it('errors out when trying to use nonexistent file with -s', function()
       eq(
         'Cannot open for reading: "'..nonexistent_fname..'": no such file or directory\n',
@@ -110,6 +117,7 @@ describe('Command-line option', function()
            '-s', nonexistent_fname}))
       eq(2, eval('v:shell_error'))
     end)
+
     it('errors out when trying to use -s twice', function()
       write_file(fname, ':call setline(1, "1")\n:wqall!\n')
       write_file(dollar_fname, ':call setline(1, "2")\n:wqall!\n')
@@ -124,4 +132,11 @@ describe('Command-line option', function()
       eq(nil, luv.fs_stat(fname_2))
     end)
   end)
+
+  it('nvim -v, :version', function()
+    matches('Run ":verbose version"', funcs.execute(':version'))
+    matches('Compilation: .*Run :checkhealth', funcs.execute(':verbose version'))
+    matches('Run "nvim %-V1 %-v"', funcs.system({nvim_prog_abs(), '-v'}))
+    matches('Compilation: .*Run :checkhealth', funcs.system({nvim_prog_abs(), '-V1', '-v'}))
+  end)
 end)