Patch 8.1.2255
Problem:    ":term ++shell" does not work on MS-Windows.
Solution:   Add MS-Windows support.
Files:      src/terminal.c, src/testdir/test_terminal.vim


*** ../vim-8.1.2254/src/terminal.c      2019-11-03 23:37:08.288934381 +0100
--- src/terminal.c      2019-11-03 23:44:31.294556861 +0100
***************
*** 846,866 ****
            term_start(NULL, argv, &opt, eap->forceit ? TERM_START_FORCEIT : 0);
        vim_free(tofree1);
        vim_free(tofree2);
  #else
        emsg(_("E279: Sorry, ++shell is not supported on this system"));
  #endif
      }
!     else
!     {
!       argvar[0].v_type = VAR_STRING;
!       argvar[0].vval.v_string = cmd;
!       argvar[1].v_type = VAR_UNKNOWN;
!       term_start(argvar, NULL, &opt, eap->forceit ? TERM_START_FORCEIT : 0);
!     }
! 
!     vim_free(tofree);
  
  theend:
      vim_free(opt.jo_eof_chars);
  }
  
--- 846,876 ----
            term_start(NULL, argv, &opt, eap->forceit ? TERM_START_FORCEIT : 0);
        vim_free(tofree1);
        vim_free(tofree2);
+       goto theend;
  #else
+ # ifdef MSWIN
+       long_u      cmdlen = STRLEN(p_sh) + STRLEN(p_shcf) + STRLEN(cmd) + 10;
+       char_u      *newcmd;
+ 
+       newcmd = alloc(cmdlen);
+       if (newcmd == NULL)
+           goto theend;
+       tofree = newcmd;
+       vim_snprintf((char *)newcmd, cmdlen, "%s %s %s", p_sh, p_shcf, cmd);
+       cmd = newcmd;
+ # else
        emsg(_("E279: Sorry, ++shell is not supported on this system"));
+       goto theend;
+ # endif
  #endif
      }
!     argvar[0].v_type = VAR_STRING;
!     argvar[0].vval.v_string = cmd;
!     argvar[1].v_type = VAR_UNKNOWN;
!     term_start(argvar, NULL, &opt, eap->forceit ? TERM_START_FORCEIT : 0);
  
  theend:
+     vim_free(tofree);
      vim_free(opt.jo_eof_chars);
  }
  
*** ../vim-8.1.2254/src/testdir/test_terminal.vim       2019-11-03 
23:37:08.288934381 +0100
--- src/testdir/test_terminal.vim       2019-11-04 23:04:16.765676853 +0100
***************
*** 2215,2229 ****
  endfunc
  
  func Test_terminal_shell_option()
!   CheckUnix
!   " exec is a shell builtin command, should fail without a shell.
!   term exec ls runtest.vim
!   call WaitForAssert({-> assert_match('job failed', term_getline(bufnr(), 
1))})
!   bwipe!
  
!   term ++shell exec ls runtest.vim
!   call WaitForAssert({-> assert_match('runtest.vim', term_getline(bufnr(), 
1))})
!   bwipe!
  endfunc
  
  func Test_terminal_setapi_and_call()
--- 2215,2239 ----
  endfunc
  
  func Test_terminal_shell_option()
!   if has('unix')
!     " exec is a shell builtin command, should fail without a shell.
!     term exec ls runtest.vim
!     call WaitForAssert({-> assert_match('job failed', term_getline(bufnr(), 
1))})
!     bwipe!
  
!     term ++shell exec ls runtest.vim
!     call WaitForAssert({-> assert_match('runtest.vim', term_getline(bufnr(), 
1))})
!     bwipe!
!   elseif has('win32')
!     " dir is a shell builtin command, should fail without a shell.
!     term dir /b runtest.vim
!     call WaitForAssert({-> assert_match('job failed', term_getline(bufnr(), 
1))})
!     bwipe!
! 
!     term ++shell dir /b runtest.vim
!     call WaitForAssert({-> assert_match('runtest.vim', term_getline(bufnr(), 
1))})
!     bwipe!
!   endif
  endfunc
  
  func Test_terminal_setapi_and_call()
*** ../vim-8.1.2254/src/version.c       2019-11-04 22:52:08.366798096 +0100
--- src/version.c       2019-11-04 23:04:36.745623833 +0100
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     2255,
  /**/

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