Improve vim-lldb expression commands for objective-c and implement evaluate-under-cursor:

1. Added new :Lpo command
2. :Lpo and :Lprint can be invoked without parameters. In that case
cursor word will be used
3. Added :LpO command in that case instead of <cword> will be used
stripped <cWORD>. This command is useful for printing objective-c
properties (for ex.: self.tableView). 

Patch by Arthur Evstifeev!!



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@182613 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Daniel Malea

utils/vim-lldb/doc/lldb.txt

@@ -37,10 +37,10 @@ Possible window name arguments to the Lhide and Lshow commands include:
     * locals
     * registers
     * threads
-                                                lldb-:Lattach
+                                                *lldb-:Lattach*
 :Lattach <process-name> Attach to a process by name.
 
-                                                lldb-:Ldetach
+                                                *lldb-:Ldetach*
 :Ldetach                Detach from the current process.
 
                                                 *lldb-:Ltarget*
@@ -90,6 +90,13 @@ Possible window name arguments to the Lhide and Lshow commands include:
                         command is invoked. If no arguments are provided,
                         a breakpoint at the location under the cursor.
 
+                                                *lldb-:Lprint*
+                                                *lldb-:Lpo*
+                                                *lldb-:LpO*
+:Lprint <expr>          Aliases to the lldb print and po commands. Cursor
+:Lpo <expr>             word (cursor WORD for LpO) will be used when 
+:LpO <expr>             expression omitted.
+
 MAPPINGS                                        *lldb-mappings*
 
 On Mac OS X (under MacVim) , the following key mappings are available:

utils/vim-lldb/plugin/lldb.vim

@@ -82,7 +82,9 @@ function! s:InitLldbPlugin()
   command -complete=custom,s:CompleteCommand -nargs=* Lwatchpoint        python ctrl.doCommand('watchpoint', '<args>')
 
   " Convenience (shortcut) LLDB commands
-  command -complete=custom,s:CompleteCommand -nargs=* Lprint             python ctrl.doCommand('print', '<args>')
+  command -complete=custom,s:CompleteCommand -nargs=* Lprint             python ctrl.doCommand('print', vim.eval("s:CursorWord('<args>')"))
+  command -complete=custom,s:CompleteCommand -nargs=* Lpo                python ctrl.doCommand('po', vim.eval("s:CursorWord('<args>')"))
+  command -complete=custom,s:CompleteCommand -nargs=* LpO                python ctrl.doCommand('po', vim.eval("s:CursorWORD('<args>')"))
   command -complete=custom,s:CompleteCommand -nargs=* Lbt                python ctrl.doCommand('bt', '<args>')
 
   " Frame/Thread-Selection (commands that also do an Uupdate but do not
@@ -135,4 +137,15 @@ returnCompleteWindow(a, l, p)
 EOF
 endfunction()
 
+" Returns cword if search term is empty
+function! s:CursorWord(term) 
+  return empty(a:term) ? expand('<cword>') : a:term 
+endfunction()
+
+" Returns cleaned cWORD if search term is empty
+function! s:CursorWORD(term) 
+  " Will strip all non-alphabetic characters from both sides
+  return empty(a:term) ?  substitute(expand('<cWORD>'), '^\A*\(.\{-}\)\A*$', '\1', '') : a:term 
+endfunction()
+
 call s:InitLldbPlugin()