feat(eval/method): partially port v8.1.1996

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.
aad222c9c9

Partial port as this does not include eval.txt change for listener_add.

Cherry-pick eval.txt changes for:
- bufadd from v8.1.1626:
  5ca1ac373a
- setloclist and setqflist headers from:
  b0d45e7f53

Correct eval.txt typo for settabwinvar method call (matches latest Vim).

src/nvim/eval.lua

@@ -314,18 +314,18 @@ return {
     setenv={args=2, base=2},
     setfperm={args=2, base=1},
     setline={args=2, base=2},
-    setloclist={args={2, 4}},
-    setmatches={args={1, 2}},
-    setpos={args=2},
-    setqflist={args={1, 3}},
-    setreg={args={2, 3}},
-    settabvar={args=3},
-    settabwinvar={args=4},
-    settagstack={args={2, 3}},
-    setwinvar={args=3},
-    sha256={args=1},
-    shellescape={args={1, 2}},
-    shiftwidth={args={0, 1}},
+    setloclist={args={2, 4}, base=2},
+    setmatches={args={1, 2}, base=1},
+    setpos={args=2, base=2},
+    setqflist={args={1, 3}, base=1},
+    setreg={args={2, 3}, base=2},
+    settabvar={args=3, base=3},
+    settabwinvar={args=4, base=4},
+    settagstack={args={2, 3}, base=2},
+    setwinvar={args=3, base=3},
+    sha256={args=1, base=1},
+    shellescape={args={1, 2}, base=1},
+    shiftwidth={args={0, 1}, base=1},
     sign_define={args={1, 2}, base=1},
     sign_getdefined={args={0, 1}, base=1},
     sign_getplaced={args={0, 2}, base=1},

src/nvim/testdir/test_bufwintabinfo.vim

@@ -48,7 +48,7 @@ function Test_getbufwintabinfo()
   tabnew | let w3_id = win_getid()
   new | let w4_id = win_getid()
   vert new | let w5_id = win_getid()
-  call setwinvar(0, 'signal', 'green')
+  eval 'green'->setwinvar(0, 'signal')
   tabfirst
   let winlist = getwininfo()
   call assert_equal(5, len(winlist))

src/nvim/testdir/test_cursor_func.vim

@@ -37,7 +37,7 @@ endfunc
 " Very short version of what matchparen does.
 function s:Highlight_Matching_Pair()
   let save_cursor = getcurpos()
-  call setpos('.', save_cursor)
+  eval save_cursor->setpos('.')
 endfunc
 
 func Test_curswant_with_autocommand()

src/nvim/testdir/test_expr.vim

@@ -493,7 +493,7 @@ func Test_setmatches()
     let set[0]['conceal'] = 5
     let exp[0]['conceal'] = '5'
   endif
-  call setmatches(set)
+  eval set->setmatches()
   call assert_equal(exp, getmatches())
 endfunc
 

src/nvim/testdir/test_functions.vim

@@ -1219,7 +1219,7 @@ func Test_shellescape()
   let save_shell = &shell
   set shell=bash
   call assert_equal("'text'", shellescape('text'))
-  call assert_equal("'te\"xt'", shellescape('te"xt'))
+  call assert_equal("'te\"xt'", 'te"xt'->shellescape())
   call assert_equal("'te'\\''xt'", shellescape("te'xt"))
 
   call assert_equal("'te%xt'", shellescape("te%xt"))

src/nvim/testdir/test_put.vim

@@ -39,7 +39,7 @@ func Test_put_lines()
   call assert_equal(['Line 3', '', 'Line 1', 'Line2'], getline(1, '$'))
   " clean up
   bw!
-  call setreg('a', a[0], a[1])
+  eval a[0]->setreg('a', a[1])
 endfunc
 
 func Test_put_expr()

src/nvim/testdir/test_quickfix.vim

@@ -811,7 +811,7 @@ func Test_locationlist()
       " NOTE: problem 1:
       " intentionally not setting 'lnum' so that the quickfix entries are not
       " valid
-      call setloclist(0, qflist, ' ')
+      eval qflist->setloclist(0, ' ')
     endfor
 
     " Test A
@@ -1699,7 +1699,7 @@ endfunc
 
 func Test_setqflist_invalid_nr()
   " The following command used to crash Vim
-  call setqflist([], ' ', {'nr' : $XXX_DOES_NOT_EXIST})
+  eval []->setqflist(' ', {'nr' : $XXX_DOES_NOT_EXIST})
 endfunc
 
 func Test_setqflist_user_sets_buftype()

src/nvim/testdir/test_sha256.vim

@@ -6,17 +6,17 @@ endif
 
 function Test_sha256()
   " test for empty string:
-  call assert_equal(sha256(""), 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855')
+  call assert_equal('e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', sha256(""))
 
   "'test for 1 char:
-  call assert_equal(sha256("a"), 'ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb')
+  call assert_equal('ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb', sha256("a"))
   "
   "test for 3 chars:
-  call assert_equal(sha256("abc"), 'ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad')
+  call assert_equal('ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad', "abc"->sha256())
 
   " test for contains meta char:
-  call assert_equal(sha256("foo\nbar"), '807eff6267f3f926a21d234f7b0cf867a86f47e07a532f15e8cc39ed110ca776')
+  call assert_equal('807eff6267f3f926a21d234f7b0cf867a86f47e07a532f15e8cc39ed110ca776', sha256("foo\nbar"))
 
   " test for contains non-ascii char:
-  call assert_equal(sha256("\xde\xad\xbe\xef"), '5f78c33274e43fa9de5659265c1d917e25c03722dcb0b8d27db8d5feaa813953')
+  call assert_equal('5f78c33274e43fa9de5659265c1d917e25c03722dcb0b8d27db8d5feaa813953', sha256("\xde\xad\xbe\xef"))
 endfunction

src/nvim/testdir/test_tabpage.vim

@@ -35,7 +35,7 @@ function Test_tabpage()
   tabnew
   tabfirst
   call settabvar(2, 'val_num', 100)
-  call settabvar(2, 'val_str', 'SetTabVar test')
+  eval 'SetTabVar test'->settabvar(2, 'val_str')
   call settabvar(2, 'val_list', ['red', 'blue', 'green'])
   "
   call assert_true(gettabvar(2, 'val_num') == 100 && gettabvar(2, 'val_str') == 'SetTabVar test' && gettabvar(2, 'val_list') == ['red', 'blue', 'green'])
@@ -184,7 +184,7 @@ function Test_tabpage_with_autocmd()
   let s:li = split(join(map(copy(winr), 'gettabwinvar('.tabn.', v:val, "a")')), '\s\+')
   call assert_equal(['a', 'a'], s:li)
   let s:li = []
-  C call map(copy(winr), 'settabwinvar('.tabn.', v:val, ''a'', v:val*2)')
+  C call map(copy(winr), '(v:val*2)->settabwinvar(' .. tabn .. ', v:val, ''a'')')
   let s:li = split(join(map(copy(winr), 'gettabwinvar('.tabn.', v:val, "a")')), '\s\+')
   call assert_equal(['2', '4'], s:li)
 

src/nvim/testdir/test_tagjump.vim

@@ -351,7 +351,7 @@ func Test_getsettagstack()
   " Try to set current index to invalid values
   call settagstack(1, {'curidx' : -1})
   call assert_equal(1, gettagstack().curidx)
-  call settagstack(1, {'curidx' : 50})
+  eval {'curidx' : 50}->settagstack(1)
   call assert_equal(4, gettagstack().curidx)
 
   " Try pushing invalid items onto the stack

src/nvim/testdir/test_vartabs.vim

@@ -330,7 +330,7 @@ func Test_vartabs_shiftwidth()
   let lines = ScreenLines([1, 2], winwidth(0))
   call s:compare_lines(expect2, lines)
   call assert_equal(20, shiftwidth(virtcol('.')-2))
-  call assert_equal(30, shiftwidth(virtcol('.')))
+  call assert_equal(30, virtcol('.')->shiftwidth())
   norm! $>>
   let expect3 = ['                                        ', '                    x                   ', '~                                       ']
   let lines = ScreenLines([1, 3], winwidth(0))