feat(eval/method): partially port v8.1.1925

Adds method call support for all functions in the patch, but it cannot
be fully ported due to missing tests for:

- getcwd(): requires chdir() and Test_chdir_func() from v8.1.1291.

Note that the method call tests for getreg() and getregtype() were
removed in v8.2.1547, which has already been ported, but doesn't seem to
have been replaced with a new test...

This patch also makes getchangelist()'s argument optional (defaults to
the current buffer).

eval.txt includes a typo for gettabwinvar(), which is fixed in
v8.1.1952.

src/nvim/eval.lua

@@ -137,9 +137,9 @@ return {
     garbagecollect={args={0, 1}},
     get={args={2, 3}, base=1},
     getbufinfo={args={0, 1}},
-    getbufline={args={2, 3}},
-    getbufvar={args={2, 3}},
-    getchangelist={args={1, 1}},
+    getbufline={args={2, 3}, base=1},
+    getbufvar={args={2, 3}, base=1},
+    getchangelist={args={0, 1}, base=1},
     getchar={args={0, 1}},
     getcharmod={},
     getcharsearch={},
@@ -148,30 +148,30 @@ return {
     getcmdpos={},
     getcmdtype={},
     getcmdwintype={},
-    getcompletion={args={2, 3}},
+    getcompletion={args={2, 3}, base=1},
     getcurpos={},
-    getcwd={args={0,2}},
-    getenv={args={1}},
+    getcwd={args={0, 2}, base=1},
+    getenv={args={1}, base=1},
     getfontname={args={0, 1}},
-    getfperm={args=1},
-    getfsize={args=1},
-    getftime={args=1},
-    getftype={args=1},
-    getjumplist={args={0, 2}},
-    getline={args={1, 2}},
+    getfperm={args=1, base=1},
+    getfsize={args=1, base=1},
+    getftime={args=1, base=1},
+    getftype={args=1, base=1},
+    getjumplist={args={0, 2}, base=1},
+    getline={args={1, 2}, base=1},
     getloclist={args={1, 2}},
     getmarklist={args={0, 1}},
     getmatches={args={0, 1}},
     getmousepos={},
     getpid={},
-    getpos={args=1},
+    getpos={args=1, base=1},
     getqflist={args={0, 1}},
-    getreg={args={0, 3}},
+    getreg={args={0, 3}, base=1},
     getreginfo={args={0, 1}, base=1},
-    getregtype={args={0, 1}},
-    gettabinfo={args={0, 1}},
-    gettabvar={args={2, 3}},
-    gettabwinvar={args={3, 4}},
+    getregtype={args={0, 1}, base=1},
+    gettabinfo={args={0, 1}, base=1},
+    gettabvar={args={2, 3}, base=1},
+    gettabwinvar={args={3, 4}, base=1},
     gettagstack={args={0, 1}},
     getwininfo={args={0, 1}},
     getwinpos={args={0, 1}},
@@ -311,7 +311,7 @@ return {
     setcharsearch={args=1},
     setcmdpos={args=1},
     setenv={args=2},
-    setfperm={args=2},
+    setfperm={args=2, base=1},
     setline={args=2},
     setloclist={args={2, 4}},
     setmatches={args={1, 2}},

src/nvim/eval/funcs.c

@@ -3088,10 +3088,16 @@ f_getbufvar_end:
 static void f_getchangelist(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 {
   tv_list_alloc_ret(rettv, 2);
-  vim_ignored = tv_get_number(&argvars[0]);  // issue errmsg if type error
-  emsg_off++;
-  const buf_T *const buf = tv_get_buf(&argvars[0], false);
-  emsg_off--;
+
+  const buf_T *buf;
+  if (argvars[0].v_type == VAR_UNKNOWN) {
+    buf = curbuf;
+  } else {
+    vim_ignored = tv_get_number(&argvars[0]);  // issue errmsg if type error
+    emsg_off++;
+    buf = tv_get_buf(&argvars[0], false);
+    emsg_off--;
+  }
   if (buf == NULL) {
     return;
   }

src/nvim/testdir/test_bufline.vim

@@ -21,7 +21,7 @@ func Test_setbufline_getbufline()
   call assert_equal(1, setbufline(b, 5, ['x']))
   call assert_equal(1, setbufline(1234, 1, ['x']))
   call assert_equal(0, setbufline(b, 4, ['d', 'e']))
-  call assert_equal(['c'], getbufline(b, 3))
+  call assert_equal(['c'], b->getbufline(3))
   call assert_equal(['d'], getbufline(b, 4))
   call assert_equal(['e'], getbufline(b, 5))
   call assert_equal([], getbufline(b, 6))

src/nvim/testdir/test_bufwintabinfo.vim

@@ -88,7 +88,7 @@ function Test_getbufwintabinfo()
     call assert_equal(2, tablist[1].tabnr)
     call assert_equal('build', tablist[0].variables.space)
     call assert_equal(w2_id, tablist[0].windows[0])
-    call assert_equal([], gettabinfo(3))
+    call assert_equal([], 3->gettabinfo())
 
     tabonly | only
 
@@ -106,7 +106,7 @@ function Test_getbufwintabinfo()
 endfunction
 
 function Test_get_buf_options()
-  let opts = getbufvar(bufnr('%'), '&')
+  let opts = bufnr()->getbufvar('&')
   call assert_equal(v:t_dict, type(opts))
   call assert_equal(8, opts.tabstop)
 endfunc

src/nvim/testdir/test_changelist.vim

@@ -8,8 +8,8 @@ func Test_getchangelist()
 
   bwipe!
   enew
-  call assert_equal([], getchangelist(10))
-  call assert_equal([[], 0], getchangelist('%'))
+  call assert_equal([], 10->getchangelist())
+  call assert_equal([[], 0], getchangelist())
 
   call writefile(['line1', 'line2', 'line3'], 'Xfile1.txt')
   call writefile(['line1', 'line2', 'line3'], 'Xfile2.txt')

src/nvim/testdir/test_cmdline.vim

@@ -260,7 +260,7 @@ func Test_getcompletion()
   endif
   let groupcount = len(getcompletion('', 'event'))
   call assert_true(groupcount > 0)
-  let matchcount = len(getcompletion('File', 'event'))
+  let matchcount = len('File'->getcompletion('event'))
   call assert_true(matchcount > 0)
   call assert_true(groupcount > matchcount)
 

src/nvim/testdir/test_edit.vim

@@ -201,11 +201,11 @@ func Test_edit_07()
   endfu
   au InsertCharPre <buffer> :call DoIt()
   call feedkeys("A\<f5>\<c-p>u\<cr>\<c-l>\<cr>", 'tx')
-  call assert_equal(["Jan\<c-l>",''], getline(1,'$'))
+  call assert_equal(["Jan\<c-l>",''], 1->getline('$'))
   %d
   call setline(1, 'J')
   call feedkeys("A\<f5>\<c-p>u\<down>\<c-l>\<cr>", 'tx')
-  call assert_equal(["January"], getline(1,'$'))
+  call assert_equal(["January"], 1->getline('$'))
 
   delfu ListMonths
   delfu DoIt
@@ -348,7 +348,7 @@ func Test_edit_12()
   call cursor(2, 4)
   call feedkeys("R^\<c-d>", 'tnix')
   call assert_equal(["\tabc", "def"], getline(1, '$'))
-  call assert_equal([0, 2, 2, 0], getpos('.'))
+  call assert_equal([0, 2, 2, 0], '.'->getpos())
   %d
   call setline(1, ["\tabc", "\t\tdef"])
   call cursor(2, 2)

src/nvim/testdir/test_environ.vim

@@ -15,7 +15,7 @@ endfunc
 
 func Test_getenv()
   unlet! $TESTENV
-  call assert_equal(v:null, getenv('TESTENV'))
+  call assert_equal(v:null, 'TESTENV'->getenv())
   let $TESTENV = 'foo'
   call assert_equal('foo', getenv('TESTENV'))
 endfunc

src/nvim/testdir/test_getvar.vim

@@ -31,7 +31,7 @@ func Test_var()
   let t:other = 777
   let def_list = [4, 5, 6, 7]
   tabrewind
-  call assert_equal([1, 2, 3], gettabvar(3, 'var_list'))
+  call assert_equal([1, 2, 3], 3->gettabvar('var_list'))
   call assert_equal([1, 2, 3], gettabvar(3, 'var_list', def_list))
   call assert_equal({'var_list': [1, 2, 3], 'other': 777}, gettabvar(3, ''))
   call assert_equal({'var_list': [1, 2, 3], 'other': 777},
@@ -61,7 +61,7 @@ func Test_var()
   let def_dict = {'dict2': 'newval'}
   wincmd b
   tabrewind
-  call assert_equal({'dict': 'tabwin'}, gettabwinvar(2, 3, 'var_dict'))
+  call assert_equal({'dict': 'tabwin'}, 2->gettabwinvar(3, 'var_dict'))
   call assert_equal({'dict': 'tabwin'},
 				\ gettabwinvar(2, 3, 'var_dict', def_dict))
   call assert_equal({'var_dict': {'dict': 'tabwin'}}, gettabwinvar(2, 3, ''))

src/nvim/testdir/test_jumplist.vim

@@ -39,7 +39,7 @@ func Test_getjumplist()
   " Traverse the jump list and verify the results
   5
   exe "normal \<C-O>"
-  call assert_equal(2, getjumplist(1)[1])
+  call assert_equal(2, 1->getjumplist()[1])
   exe "normal 2\<C-O>"
   call assert_equal(0, getjumplist(1, 1)[1])
   exe "normal 3\<C-I>"

src/nvim/testdir/test_stat.vim

@@ -10,7 +10,7 @@ func CheckFileTime(doSleep)
   let fl = ['Hello World!']
   for fname in fnames
     call writefile(fl, fname)
-    call add(times, getftime(fname))
+    call add(times, fname->getftime())
     if a:doSleep
       sleep 1
     endif
@@ -19,8 +19,8 @@ func CheckFileTime(doSleep)
   let time_correct = (times[0] <= times[1] && times[1] <= times[2])
   if a:doSleep || time_correct
     call assert_true(time_correct, printf('Expected %s <= %s <= %s', times[0], times[1], times[2]))
-    call assert_equal(strlen(fl[0] . "\n"), getfsize(fnames[0]))
-    call assert_equal('file', getftype(fnames[0]))
+    call assert_equal(strlen(fl[0] . "\n"), fnames[0]->getfsize())
+    call assert_equal('file', fnames[0]->getftype())
     call assert_equal('rw-', getfperm(fnames[0])[0:2])
     let result = 1
   endif