vim-patch:8.0.1787: cannot insert the whole cursor line

Problem:    Cannot insert the whole cursor line.
Solution:   Make CTRL-R CTRL-L work. (Andy Massimino, closes vim/vim#2857)
https://github.com/vim/vim/commit/e2c8d8392684a940cc5608acc73ff47486bd7b92

4 files changed, 18 insertions, 3 deletions

diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index c46a9fc2d8..f4bc2972bc 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -163,12 +163,14 @@ CTRL-R CTRL-F				*c_CTRL-R_CTRL-F* *c_<C-R>_<C-F>*
 CTRL-R CTRL-P				*c_CTRL-R_CTRL-P* *c_<C-R>_<C-P>*
 CTRL-R CTRL-W				*c_CTRL-R_CTRL-W* *c_<C-R>_<C-W>*
 CTRL-R CTRL-A				*c_CTRL-R_CTRL-A* *c_<C-R>_<C-A>*
+CTRL-R CTRL-L				*c_CTRL-R_CTRL-L* *c_<C-R>_<C-L>*
 		Insert the object under the cursor:
 			CTRL-F	the Filename under the cursor
 			CTRL-P	the Filename under the cursor, expanded with
 				'path' as in |gf|
 			CTRL-W	the Word under the cursor
 			CTRL-A	the WORD under the cursor; see |WORD|
+			CTRL-L	the line under the cursor
 
 		When 'incsearch' is set the cursor position at the end of the
 		currently displayed match is used.  With CTRL-W the part of
@@ -176,8 +178,8 @@ CTRL-R CTRL-A				*c_CTRL-R_CTRL-A* *c_<C-R>_<C-A>*
 
 					*c_CTRL-R_CTRL-R* *c_<C-R>_<C-R>*
 					*c_CTRL-R_CTRL-O* *c_<C-R>_<C-O>*
-CTRL-R CTRL-R {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A}
-CTRL-R CTRL-O {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A}
+CTRL-R CTRL-R {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A CTRL-L}
+CTRL-R CTRL-O {0-9a-z"%#:-=. CTRL-F CTRL-P CTRL-W CTRL-A CTRL-L}
 		Insert register or object under the cursor.  Works like
 		|c_CTRL-R| but inserts the text literally.  For example, if
 		register a contains "xy^Hz" (where ^H is a backspace),
diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index 0190cfabe5..1192f3cb84 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -3295,8 +3295,10 @@ static bool cmdline_paste(int regname, bool literally, bool remcr)
   /* check for valid regname; also accept special characters for CTRL-R in
    * the command line */
   if (regname != Ctrl_F && regname != Ctrl_P && regname != Ctrl_W
-      && regname != Ctrl_A && !valid_yank_reg(regname, false))
+      && regname != Ctrl_A && regname != Ctrl_L
+      && !valid_yank_reg(regname, false)) {
     return FAIL;
+  }
 
   /* A register containing CTRL-R can cause an endless loop.  Allow using
    * CTRL-C to break the loop. */
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 7defde731a..af95f94946 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -1257,6 +1257,14 @@ int get_spec_reg(
     *allocated = TRUE;
     return TRUE;
 
+  case Ctrl_L:                  // Line under cursor
+    if (!errmsg) {
+      return false;
+    }
+
+    *argp = ml_get_buf(curwin->w_buffer, curwin->w_cursor.lnum, false);
+    return true;
+
   case '_':                     /* black hole: always empty */
     *argp = (char_u *)"";
     return TRUE;
diff --git a/src/nvim/testdir/test_cmdline.vim b/src/nvim/testdir/test_cmdline.vim
index 1b7bd83b3c..c302948ba3 100644
--- a/src/nvim/testdir/test_cmdline.vim
+++ b/src/nvim/testdir/test_cmdline.vim
@@ -321,6 +321,9 @@ func Test_paste_in_cmdline()
   call feedkeys("ft:aaa \<C-R>\<C-F> bbb\<C-B>\"\<CR>", 'tx')
   call assert_equal('"aaa /tmp/some bbb', @:)
 
+  call feedkeys(":aaa \<C-R>\<C-L> bbb\<C-B>\"\<CR>", 'tx')
+  call assert_equal('"aaa '.getline(1).' bbb', @:)
+
   set incsearch
   call feedkeys("fy:aaa veryl\<C-R>\<C-W> bbb\<C-B>\"\<CR>", 'tx')
   call assert_equal('"aaa verylongword bbb', @:)