Merge pull request #1182 from bfredl/clipboard

clipboard: support separate +/* clipboards, linewise copy/paste and add tests

9 files changed, 319 insertions, 94 deletions

diff --git a/runtime/autoload/provider/clipboard.vim b/runtime/autoload/provider/clipboard.vim
index 46c05a882c..458ef6257d 100644
--- a/runtime/autoload/provider/clipboard.vim
+++ b/runtime/autoload/provider/clipboard.vim
@@ -1,11 +1,11 @@
 " The clipboard provider uses shell commands to communicate with the clipboard.
 " The provider function will only be registered if one of the supported
 " commands are available.
-let s:copy = ''
-let s:paste = ''
+let s:copy = {}
+let s:paste = {}
 
 function! s:try_cmd(cmd, ...)
-  let out = a:0 ? systemlist(a:cmd, a:1) : systemlist(a:cmd)
+  let out = a:0 ? systemlist(a:cmd, a:1, 1) : systemlist(a:cmd, [''], 1)
   if v:shell_error
     echo "clipboard: error: ".(len(out) ? out[0] : '')
     return ''
@@ -14,14 +14,20 @@ function! s:try_cmd(cmd, ...)
 endfunction
 
 if executable('pbcopy')
-  let s:copy = 'pbcopy'
-  let s:paste = 'pbpaste'
-elseif executable('xsel')
-  let s:copy = 'xsel -i -b'
-  let s:paste = 'xsel -o -b'
+  let s:copy['+'] = 'pbcopy'
+  let s:paste['+'] = 'pbpaste'
+  let s:copy['*'] = s:copy['+']
+  let s:paste['*'] = s:paste['+']
 elseif executable('xclip')
-  let s:copy = 'xclip -i -selection clipboard'
-  let s:paste = 'xclip -o -selection clipboard'
+  let s:copy['+'] = 'xclip -i -selection clipboard'
+  let s:paste['+'] = 'xclip -o -selection clipboard'
+  let s:copy['*'] = 'xclip -i -selection primary'
+  let s:paste['*'] = 'xclip -o -selection primary'
+elseif executable('xsel')
+  let s:copy['+'] = 'xsel -i -b'
+  let s:paste['+'] = 'xsel -o -b'
+  let s:copy['*'] = 'xsel -i -p'
+  let s:paste['*'] = 'xsel -o -p'
 else
   echom 'clipboard: No shell command for communicating with the clipboard found.'
   finish
@@ -29,14 +35,14 @@ endif
 
 let s:clipboard = {}
 
-function! s:clipboard.get(...)
-  return s:try_cmd(s:paste)
+function! s:clipboard.get(reg)
+  return s:try_cmd(s:paste[a:reg])
 endfunction
 
-function! s:clipboard.set(...)
-  call s:try_cmd(s:copy, a:1)
+function! s:clipboard.set(lines, regtype, reg)
+  call s:try_cmd(s:copy[a:reg], a:lines)
 endfunction
 
 function! provider#clipboard#Call(method, args)
-  return s:clipboard[a:method](a:args)
+  return call(s:clipboard[a:method],a:args,s:clipboard)
 endfunction
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 0844d74070..8672ab2af9 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7547,13 +7547,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 	Note that this causes the whole buffer to be stored in memory.  Set
 	this option to a lower value if you run out of memory.
 
-			                          {Nvim} *'unnamedclip'* *ucp'*
-'unnamedclip' 'ucp'	boolean	(default off)
-			global
-	Use the unnamed register to access the clipboard(when available).
-	This option has the same effect of setting 'clipboard' to
-	'unnamed/unnamedplus' in Vim.
-
 						*'updatecount'* *'uc'*
 'updatecount' 'uc'	number	(default: 200)
 			global
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index be69bdbe61..b4d1677520 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -5119,6 +5119,20 @@ void list_append_tv(list_T *l, typval_T *tv)
 }
 
 /*
+ * Add a list to a list.
+ */
+void list_append_list(list_T *list, list_T *itemlist)
+{
+  listitem_T  *li = listitem_alloc();
+
+  li->li_tv.v_type = VAR_LIST;
+  li->li_tv.v_lock = 0;
+  li->li_tv.vval.v_list = itemlist;
+  list_append(list, li);
+  ++list->lv_refcount;
+}
+
+/*
  * Add a dictionary to a list.  Used by getqflist().
  */
 void list_append_dict(list_T *list, dict_T *dict)
@@ -19815,16 +19829,12 @@ typval_T eval_call_provider(char *provider, char *method, list_T *arguments)
 
 bool eval_has_provider(char *name)
 {
-#define source_provider(name) \
-  do_source((uint8_t *)"$VIMRUNTIME/autoload/provider/" name ".vim", \
-                       false, \
-                       false)
 
 #define check_provider(name)                                              \
   if (has_##name == -1) {                                                 \
     has_##name = !!find_func((uint8_t *)"provider#" #name "#Call");       \
     if (!has_##name) {                                                    \
-      source_provider(#name);                                             \
+      script_autoload((uint8_t *)"provider#" #name "#Call", false);       \
       has_##name = !!find_func((uint8_t *)"provider#" #name "#Call");     \
     }                                                                     \
   }
diff --git a/src/nvim/normal.c b/src/nvim/normal.c
index 1b21100933..192633a996 100644
--- a/src/nvim/normal.c
+++ b/src/nvim/normal.c
@@ -915,14 +915,7 @@ getcount:
       && !oap->op_type
       && (idx < 0 || !(nv_cmds[idx].cmd_flags & NV_KEEPREG))) {
     clearop(oap);
-    {
-      int regname = 0;
-
-      /* Adjust the register according to 'clipboard', so that when
-       * "unnamed" is present it becomes '*' or '+' instead of '"'. */
-      adjust_clipboard_register(&regname);
-      set_reg_var(regname);
-    }
+    set_reg_var(0);
   }
 
   /* Get the length of mapped chars again after typing a count, second
@@ -5105,7 +5098,6 @@ static void nv_brackets(cmdarg_T *cap)
         end = equalpos(start, VIsual) ? curwin->w_cursor : VIsual;
         curwin->w_cursor = (dir == BACKWARD ? start : end);
       }
-      adjust_clipboard_register(&regname);
       prep_redo_cmd(cap);
       do_put(regname, dir, cap->count1, PUT_FIXINDENT);
       if (was_visual) {
@@ -7272,10 +7264,8 @@ static void nv_put(cmdarg_T *cap)
        */
       was_visual = true;
       regname = cap->oap->regname;
-      bool adjusted = adjust_clipboard_register(&regname);
       if (regname == 0 || regname == '"'
           || VIM_ISDIGIT(regname) || regname == '-'
-          || adjusted
           ) {
         /* The delete is going to overwrite the register we want to
          * put, save it first. */
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 6bf3f6036f..c20a017088 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -60,6 +60,7 @@
 #define DELETION_REGISTER 36
 #define CLIP_REGISTER 37
 
+# define CB_UNNAMEDMASK         (CB_UNNAMED | CB_UNNAMEDPLUS)
 /*
  * Each yank register is an array of pointers to lines.
  */
@@ -74,6 +75,7 @@ static struct yankreg   *y_current;         /* ptr to current yankreg */
 static int y_append;                        /* TRUE when appending */
 static struct yankreg   *y_previous = NULL; /* ptr to last written yankreg */
 
+static bool clipboard_didwarn_unnamed = false;
 /*
  * structure used by block_prep, op_delete and op_yank for blockwise operators
  * also op_change, op_shift, op_insert, op_replace - AKelly
@@ -751,7 +753,8 @@ void get_yank_register(int regname, int writing)
   int i;
 
   y_append = FALSE;
-  if ((regname == 0 || regname == '"') && !writing && y_previous != NULL) {
+  int unnamedclip = cb_flags & CB_UNNAMEDMASK;
+  if ((regname == 0 || regname == '"') && !unnamedclip && !writing && y_previous != NULL) {
     y_current = y_previous;
     return;
   }
@@ -1302,18 +1305,6 @@ cmdline_paste_reg (
   return OK;
 }
 
-bool adjust_clipboard_register(int *rp)
-{
-  // If no reg. specified and 'unnamedclip' is set, use the
-  // clipboard register.
-  if (*rp == 0 && p_unc && eval_has_provider("clipboard")) {
-    *rp = '+';
-    return true;
-  }
-
-  return false;
-}
-
 /*
  * Handle a delete operation.
  *
@@ -1328,7 +1319,6 @@ int op_delete(oparg_T *oap)
   struct block_def bd;
   linenr_T old_lcount = curbuf->b_ml.ml_line_count;
   int did_yank = FALSE;
-  int orig_regname = oap->regname;
 
   if (curbuf->b_ml.ml_flags & ML_EMPTY)             /* nothing to do */
     return OK;
@@ -1342,8 +1332,6 @@ int op_delete(oparg_T *oap)
     return FAIL;
   }
 
-  bool adjusted = adjust_clipboard_register(&oap->regname);
-
   if (has_mbyte)
     mb_adjust_opend(oap);
 
@@ -1393,9 +1381,10 @@ int op_delete(oparg_T *oap)
    * register.  For the black hole register '_' don't yank anything.
    */
   if (oap->regname != '_') {
-    if (oap->regname != 0) {
+    bool unnamedclip = oap->regname == 0 && (cb_flags & CB_UNNAMEDMASK);
+    if (oap->regname != 0 || unnamedclip) {
       /* check for read-only register */
-      if (!valid_yank_reg(oap->regname, TRUE)) {
+      if (!( valid_yank_reg(oap->regname, TRUE) || unnamedclip )) {
         beep_flush();
         return OK;
       }
@@ -1407,10 +1396,8 @@ int op_delete(oparg_T *oap)
     /*
      * Put deleted text into register 1 and shift number registers if the
      * delete contains a line break, or when a regname has been specified.
-     * Use the register name from before adjust_clip_reg() may have
-     * changed it.
      */
-    if (orig_regname != 0 || oap->motion_type == MLINE
+    if (oap->regname != 0 || oap->motion_type == MLINE
         || oap->line_count > 1 || oap->use_reg_one) {
       y_current = &y_regs[9];
       free_yank_all();                          /* free register nine */
@@ -1424,9 +1411,7 @@ int op_delete(oparg_T *oap)
 
     /* Yank into small delete register when no named register specified
      * and the delete is within one line. */
-    if ((
-          adjusted ||
-          oap->regname == 0) && oap->motion_type != MLINE
+    if (oap->regname == 0 && oap->motion_type != MLINE
         && oap->line_count == 1) {
       oap->regname = '-';
       get_yank_register(oap->regname, TRUE);
@@ -2623,7 +2608,6 @@ do_put (
   int allocated = FALSE;
   long cnt;
 
-  adjust_clipboard_register(&regname);
   get_clipboard(regname);
 
   if (flags & PUT_FIXINDENT)
@@ -3215,7 +3199,6 @@ void ex_display(exarg_T *eap)
         )
       continue;             /* did not ask for this register */
 
-    adjust_clipboard_register(&name);
     get_clipboard(name);
 
     if (i == -1) {
@@ -4842,6 +4825,7 @@ void write_reg_contents_ex(int name,
   if (!y_append && !must_append)
     free_yank_all();
   str_to_reg(y_current, yank_type, str, len, block_len);
+  set_clipboard(name);
 
 
   /* ':let @" = "val"' should change the meaning of the "" register */
@@ -5225,33 +5209,82 @@ static void free_register(struct yankreg *reg)
   y_current = curr;
 }
 
-static void copy_register(struct yankreg *dest, struct yankreg *src)
-{
-  free_register(dest);
-  *dest = *src;
-  dest->y_array = xcalloc(src->y_size, sizeof(uint8_t *));
-  for (int j = 0; j < src->y_size; ++j) {
-    dest->y_array[j] = (uint8_t *)xstrdup((char *)src->y_array[j]);
+// return target register
+static int adjust_clipboard_name(int *name) {
+  if (*name == '*' || *name == '+') {
+    if(!eval_has_provider("clipboard")) {
+      EMSG("clipboard: provider is not available");
+      return -1;
+    }
+    return CLIP_REGISTER;
+  } else if (*name == NUL && (cb_flags & (CB_UNNAMED | CB_UNNAMEDPLUS))) {
+    if(!eval_has_provider("clipboard")) {
+      if (!clipboard_didwarn_unnamed) {
+        msg((char_u*)"clipboard: provider not available, ignoring clipboard=unnamed[plus]");
+        clipboard_didwarn_unnamed = true;
+      }
+      return -1;
+    }
+    if (cb_flags & CB_UNNAMEDPLUS) {
+      *name = '+';
+    } else {
+      *name = '*';
+    }
+    return 0; //unnamed
   }
+  // don't do anything for other register names
+  return -1;
 }
 
 static void get_clipboard(int name)
 {
-  if (!(name == '*' || name == '+'
-        || (p_unc && !name && eval_has_provider("clipboard")))) {
+  int ireg = adjust_clipboard_name(&name);
+  if (ireg < 0) {
     return;
   }
 
-  struct yankreg *reg = &y_regs[CLIP_REGISTER];
+  struct yankreg *reg = &y_regs[ireg];
   free_register(reg);
+
   list_T *args = list_alloc();
+  char_u regname = name;
+  list_append_string(args, &regname, 1);
+
   typval_T result = eval_call_provider("clipboard", "get", args);
 
   if (result.v_type != VAR_LIST) {
     goto err;
   }
 
-  list_T *lines = result.vval.v_list;
+  list_T *res = result.vval.v_list, *lines = NULL;
+  if (res->lv_len == 2 && res->lv_first->li_tv.v_type == VAR_LIST) {
+    lines = res->lv_first->li_tv.vval.v_list;
+    if (res->lv_last->li_tv.v_type != VAR_STRING) {
+      goto err;
+    }
+    char_u* regtype = res->lv_last->li_tv.vval.v_string;
+    if (regtype == NULL || strlen((char*)regtype) != 1) {
+      goto err;
+    }
+    switch (regtype[0]) {
+    case 'v': case 'c':
+      reg->y_type = MCHAR;
+      break;
+    case 'V': case 'l':
+      reg->y_type = MLINE;
+      break;
+    case 'b': case Ctrl_V:
+      reg->y_type = MBLOCK;
+      break;
+    default:
+      goto err;
+    }
+  } else {
+    lines = res;
+    // provider did not specify regtype, calculate it below
+    reg->y_type = MAUTO;
+  }
+
   reg->y_array = xcalloc(lines->lv_len, sizeof(uint8_t *));
   reg->y_size = lines->lv_len;
 
@@ -5263,9 +5296,23 @@ static void get_clipboard(int name)
     reg->y_array[i++] = (uint8_t *)xstrdup((char *)li->li_tv.vval.v_string);
   }
 
-  if (!name && p_unc) {
-    // copy to the unnamed register
-    copy_register(&y_regs[0], reg);
+  if (reg->y_type == MAUTO) {
+    if (reg->y_size > 0 && strlen((char*)reg->y_array[reg->y_size-1]) == 0) {
+      reg->y_type = MLINE;
+      free(reg->y_array[reg->y_size-1]);
+      reg->y_size--;
+    } else {
+      reg->y_type = MCHAR;
+    }
+  } else if (reg->y_type == MBLOCK) {
+    int maxlen = 0;
+    for (int i = 0; i < reg->y_size; i++) {
+      int rowlen = STRLEN(reg->y_array[i]);
+      if (rowlen > maxlen) {
+        maxlen = rowlen;
+      }
+    }
+    reg->y_width = maxlen-1;
   }
 
   return;
@@ -5279,22 +5326,17 @@ err:
   }
   reg->y_array = NULL;
   reg->y_size = 0;
-  EMSG("Clipboard provider returned invalid data");
+  EMSG("clipboard: provider returned invalid data");
 }
 
 static void set_clipboard(int name)
 {
-  if (!(name == '*' || name == '+'
-        || (p_unc && !name && eval_has_provider("clipboard")))) {
+  int ireg = adjust_clipboard_name(&name);
+  if (ireg < 0) {
     return;
   }
 
-  struct yankreg *reg = &y_regs[CLIP_REGISTER];
-
-  if (!name && p_unc) {
-    // copy from the unnamed register
-    copy_register(reg, &y_regs[0]);
-  }
+  struct yankreg *reg = &y_regs[ireg];
 
   list_T *lines = list_alloc();
 
@@ -5302,5 +5344,26 @@ static void set_clipboard(int name)
     list_append_string(lines, reg->y_array[i], -1);
   }
 
-  (void)eval_call_provider("clipboard", "set", lines);
+  list_T *args = list_alloc();
+  list_append_list(args, lines);
+
+  char_u regtype;
+  switch (reg->y_type) {
+  case MLINE:
+    regtype = 'V';
+    list_append_string(lines, (char_u*)"", 0);
+    break;
+  case MCHAR:
+    regtype = 'v';
+    break;
+  case MBLOCK:
+    regtype = 'b';
+    break;
+  }
+  list_append_string(args, &regtype, 1);
+
+  char_u regname = name;
+  list_append_string(args, &regname, 1);
+
+  (void)eval_call_provider("clipboard", "set", args);
 }
diff --git a/src/nvim/option.c b/src/nvim/option.c
index 2882d7a511..fd0978f3a6 100644
--- a/src/nvim/option.c
+++ b/src/nvim/option.c
@@ -527,7 +527,7 @@ static struct vimoption
     (char_u *)0L}
    SCRIPTID_INIT},
   {"clipboard",   "cb",   P_STRING|P_VI_DEF|P_COMMA|P_NODUP,
-   (char_u *)NULL, PV_NONE,
+   (char_u *)&p_cb, PV_NONE,
    {(char_u *)"", (char_u *)0L}
    SCRIPTID_INIT},
   {"cmdheight",   "ch",   P_NUM|P_VI_DEF|P_RALL,
@@ -1620,9 +1620,6 @@ static struct vimoption
   {"undoreload",  "ur",   P_NUM|P_VI_DEF,
    (char_u *)&p_ur, PV_NONE,
    { (char_u *)10000L, (char_u *)0L} SCRIPTID_INIT},
-  {"unnamedclip",  "ucp",   P_BOOL|P_VI_DEF|P_VIM,
-   (char_u *)&p_unc, PV_NONE,
-   {(char_u *)FALSE, (char_u *)FALSE} SCRIPTID_INIT},
   {"updatecount", "uc",   P_NUM|P_VI_DEF,
    (char_u *)&p_uc, PV_NONE,
    {(char_u *)200L, (char_u *)0L} SCRIPTID_INIT},
@@ -4279,6 +4276,10 @@ did_set_string_option (
     if (check_opt_strings(p_ead, p_ead_values, FALSE) != OK)
       errmsg = e_invarg;
   }
+  else if (varp == &p_cb) {
+    if (opt_strings_flags(p_cb, p_cb_values, &cb_flags, TRUE) != OK)
+      errmsg = e_invarg;
+  }
   /* When 'spelllang' or 'spellfile' is set and there is a window for this
    * buffer in which 'spell' is set load the wordlists. */
   else if (varp == &(curbuf->b_s.b_p_spl) || varp == &(curbuf->b_s.b_p_spf)) {
@@ -4846,7 +4847,6 @@ char_u *check_stl_option(char_u *s)
   return NULL;
 }
 
-
 /*
  * Set curbuf->b_cap_prog to the regexp program for 'spellcapcheck'.
  * Return error message when failed, NULL when OK.
diff --git a/src/nvim/option_defs.h b/src/nvim/option_defs.h
index 89264f8982..39dfbe8b88 100644
--- a/src/nvim/option_defs.h
+++ b/src/nvim/option_defs.h
@@ -317,6 +317,13 @@ EXTERN char_u   *p_enc;         /* 'encoding' */
 EXTERN int p_deco;              /* 'delcombine' */
 EXTERN char_u   *p_ccv;         /* 'charconvert' */
 EXTERN char_u   *p_cedit;       /* 'cedit' */
+EXTERN char_u   *p_cb;          /* 'clipboard' */
+EXTERN unsigned cb_flags;
+#ifdef IN_OPTION_C
+static char *(p_cb_values[]) = {"unnamed", "unnamedplus", NULL};
+#endif
+# define CB_UNNAMED             0x001
+# define CB_UNNAMEDPLUS         0x002
 EXTERN long p_cwh;              /* 'cmdwinheight' */
 EXTERN long p_ch;               /* 'cmdheight' */
 EXTERN int p_confirm;           /* 'confirm' */
@@ -582,7 +589,6 @@ static char *(p_ttym_values[]) =
 EXTERN char_u   *p_udir;        /* 'undodir' */
 EXTERN long p_ul;               /* 'undolevels' */
 EXTERN long p_ur;               /* 'undoreload' */
-EXTERN int p_unc;               /* 'unnamedclip' */
 EXTERN long p_uc;               /* 'updatecount' */
 EXTERN long p_ut;               /* 'updatetime' */
 EXTERN char_u   *p_fcs;         /* 'fillchar' */
diff --git a/test/functional/clipboard/autoload/provider/clipboard.vim b/test/functional/clipboard/autoload/provider/clipboard.vim
new file mode 100644
index 0000000000..6c05a19fc3
--- /dev/null
+++ b/test/functional/clipboard/autoload/provider/clipboard.vim
@@ -0,0 +1,16 @@
+let g:test_clip = { '+': [''], '*': [''], }
+
+let s:methods = {}
+
+function! s:methods.get(reg)
+  return g:test_clip[a:reg]
+endfunction
+
+function! s:methods.set(lines, regtype, reg)
+  let g:test_clip[a:reg] = a:lines
+endfunction
+
+
+function! provider#clipboard#Call(method, args)
+  return call(s:methods[a:method],a:args,s:methods)
+endfunction
diff --git a/test/functional/clipboard/clipboard_provider_spec.lua b/test/functional/clipboard/clipboard_provider_spec.lua
new file mode 100644
index 0000000000..ccbb74e487
--- /dev/null
+++ b/test/functional/clipboard/clipboard_provider_spec.lua
@@ -0,0 +1,141 @@
+-- Test clipboard provider support
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect, eq, eval = helpers.execute, helpers.expect, helpers.eq, helpers.eval
+local nvim, run, stop, restart = helpers.nvim, helpers.run, helpers.stop, helpers.restart
+
+local function reset()
+  clear()
+  execute('let &rtp = "test/functional/clipboard,".&rtp')
+end
+
+local function basic_register_test()
+  insert("some words")
+
+  feed('^dwP')
+  expect('some words')
+
+  feed('veyP')
+  expect('some words words')
+
+  feed('^dwywe"-p')
+  expect('wordssome  words')
+
+  feed('p')
+  expect('wordssome words  words')
+
+  feed('yyp')
+  expect([[
+    wordssome words  words
+    wordssome words  words]])
+  feed('d-')
+
+  insert([[
+    some text, and some more
+    random text stuff]])
+  feed('ggtav+2ed$p')
+  expect([[
+    some text, stuff and some more
+    random text]])
+  reset()
+end
+
+describe('clipboard usage', function()
+  setup(reset)
+  it("works", function()
+    basic_register_test()
+
+    -- "* and unnamed should function as independent registers
+    insert("some words")
+    feed('^"*dwdw"*P')
+    expect('some ')
+    eq({'some '}, eval("g:test_clip['*']"))
+    reset()
+
+    -- "* and "+ should be independent when the provider supports it
+    insert([[
+      text:
+      first line
+      secound line
+      third line]])
+
+    feed('G"+dd"*dddd"+p"*pp')
+    expect([[
+      text:
+      third line
+      secound line
+      first line]])
+    -- linewise selection should be encoded as an extra newline
+    eq({'third line', ''}, eval("g:test_clip['+']"))
+    eq({'secound line', ''}, eval("g:test_clip['*']"))
+    reset()
+
+    -- handle null bytes
+    insert("some\x16000text\n\x16000very binary\x16000")
+    feed('"*y-+"*p')
+    eq({'some\ntext', '\nvery binary\n',''}, eval("g:test_clip['*']"))
+    expect("some\x00text\n\x00very binary\x00\nsome\x00text\n\x00very binary\x00")
+
+    -- test getreg/getregtype
+    eq('some\ntext\n\nvery binary\n\n', eval("getreg('*', 1)"))
+    eq("V", eval("getregtype('*')"))
+    reset()
+
+    -- blockwise paste
+    insert([[
+      much
+      text]])
+    feed('"*yy') -- force load of provider
+    execute("let g:test_clip['*'] = [['very','block'],'b']")
+    feed('gg"*P')
+    expect([[
+      very much
+      blocktext]])
+    eq("\x165", eval("getregtype('*')"))
+    reset()
+
+    -- test setreg
+    execute('call setreg("*", "setted\\ntext", "c")')
+    execute('call setreg("+", "explicitly\\nlines", "l")')
+    feed('"+P"*p')
+    expect([[
+        esetted
+        textxplicitly
+        lines
+        ]])
+    reset()
+
+    -- test let @+ (issue #1427)
+    execute("let @+ = 'some'")
+    execute("let @* = ' other stuff'")
+    eq({'some'}, eval("g:test_clip['+']"))
+    eq({' other stuff'}, eval("g:test_clip['*']"))
+    feed('"+p"*p')
+    expect('some other stuff')
+    execute("let @+ .= ' more'")
+    feed('dd"+p')
+    expect('some more')
+    reset()
+
+    -- the basic behavior of unnamed register should be the same
+    -- even when handled by clipboard provider
+    execute('set clipboard=unnamed')
+    basic_register_test()
+
+    -- with cb=unnamed, "* and unnamed will be the same register
+    execute('set clipboard=unnamed')
+    insert("some words")
+    feed('^"*dwdw"*P')
+    expect('words')
+    eq({'words'}, eval("g:test_clip['*']"))
+
+    execute("let g:test_clip['*'] = ['linewise stuff','']")
+    feed('p')
+    expect([[
+      words
+      linewise stuff]])
+    reset()
+
+    end)
+end)