patch 9.0.0285: it is not easy to change the command line from a plugin
Problem: It is not easy to change the command line from a plugin.
Solution: Add setcmdline(). (Shougo Matsushita, closes #10869)
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 3372e8d..121ff25 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -3262,4 +3262,44 @@
set wildoptions& wildmenu&
endfunc
+func Test_setcmdline()
+ func SetText(text, pos)
+ call assert_equal(0, setcmdline(a:text))
+ call assert_equal(a:text, getcmdline())
+ call assert_equal(len(a:text) + 1, getcmdpos())
+
+ call assert_equal(0, setcmdline(a:text, a:pos))
+ call assert_equal(a:text, getcmdline())
+ call assert_equal(a:pos, getcmdpos())
+
+ call assert_fails('call setcmdline("' .. a:text .. '", -1)', 'E487:')
+ call assert_fails('call setcmdline({}, 0)', 'E928:')
+ call assert_fails('call setcmdline("' .. a:text .. '", {})', 'E728:')
+
+ return ''
+ endfunc
+
+ call feedkeys(":\<C-R>=SetText('set rtp?', 2)\<CR>\<CR>", 'xt')
+ call assert_equal('set rtp?', @:)
+
+ " setcmdline() returns 1 when not editing the command line.
+ call assert_equal(1, 'foo'->setcmdline())
+
+ " Called in custom function
+ func CustomComplete(A, L, P)
+ call assert_equal(0, setcmdline("DoCmd "))
+ return "January\nFebruary\nMars\n"
+ endfunc
+
+ com! -nargs=* -complete=custom,CustomComplete DoCmd :
+ call feedkeys(":DoCmd \<C-A>\<C-B>\"\<CR>", 'tx')
+ call assert_equal('"DoCmd January February Mars', @:)
+
+ " Called in <expr>
+ cnoremap <expr>a setcmdline('let foo=')
+ call feedkeys(":a\<CR>", 'tx')
+ call assert_equal('let foo=0', @:)
+ cunmap a
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab