[vim]Correct some unused shortcurt : use cscope and folding

.vimrc

@@ -5,7 +5,7 @@
 "   F2          open file
 "   F3          search
 "   F4          open include file
-"   F5          go to declaration
+"   F5          find C symbol
 "   F6          go to definition
 "   F7          go to calls
 "   F8          view tag list
@@ -228,8 +228,8 @@ set mat=5
 " search word and list lines to jump with F3
 map <F3> [I:let nr = input("Which one: ") <Bar>execute "normal " . nr ."[\t"<CR>
 " go to declaration with F5
-map <silent> <F5> gd:nohlsearch<CR>
+" map <silent> <F5> gd:nohlsearch<CR>
-imap <F5> <ESC><F5>i
+" imap <F5> <ESC><F5>i
 " try to go to definition or declaration with , and go back with ;
 function GoToDefinition()
 	try
@@ -288,6 +288,9 @@ if has("cscope")
 	" open include file with F4 and split with shift+F4
 	nmap <F4> :cscope find f <C-R>=expand("<cfile>")<CR><CR>
 	nmap <S-F4> :scscope find f <C-R>=expand("<cfile>")<CR><CR>
+	" find this C symbol with F5 and split with shift+F5
+    nmap <F5> :cscope find s <C-R>=expand("<cfile>")<CR><CR>
+	nmap <S-F5> :scscope find s <C-R>=expand("<cfile>")<CR><CR>
 	" go to definition with F6 and split with shift+F6 and use ctags with alt+shift+F6
 	nmap <F6> :cscope find g <C-R>=expand("<cword>")<CR><CR>
 	nmap <S-F6> :scscope find g <C-R>=expand("<cword>")<CR><CR>
@@ -323,13 +326,21 @@ if has("cscope")
 	nmap <C-@><C-@>i :vertical scscope find i ^<C-R>=expand("<cfile>")<CR>$<CR>
 	nmap <C-@><C-@>d :vertical scscope find d <C-R>=expand("<cword>")<CR><CR>
 	" s  symbol    find all references to the token under cursor
-	" g  global    find global definition of the token under cursor
+    "               //find this C symbol
+	" g  global    find global definition of the token under cursori
+    "               //find this definition
 	" c  calls     find all calls to the function name under cursor
-	" t  text      find all instances of the text under cursor
+    "               //find function calling this function
-	" e  egrep     egrep search for the word under cursor
-	" f  file      open the filename under cursor
-	" i  includes  find files that include the filename under cursor
 	" d  called    find functions that function under cursor calls
+    "               //find function called by this function
+	" t  text      find all instances of the text under cursor
+    "               //find this text string
+	" e  egrep     egrep search for the word under cursor
+    "               //find this egrep pattern
+	" f  file      open the filename under cursor
+    "               //find this file
+	" i  includes  find files that include the filename under cursor
+    "               //find files  #including this file
 endif
 
 " cat Makefile | grep '\-I\/' | tr '[:space:]' '\n' | grep '\-I/' | sort -u | tr '\n' ' '
@@ -449,6 +460,26 @@ if has("autocmd")
 	autocmd BufRead,BufNewFile COMMIT_EDITMSG setf git
 endif
 
+" zf#j creates a fold from the cursor down # lines.
+"zf/string creates a fold from the cursor to string .
+"zj moves the cursor to the next fold.
+"zk moves the cursor to the previous fold.
+"zo opens a fold at the cursor.
+"zO opens all folds at the cursor.
+"zm increases the foldlevel by one.
+"zM closes all open folds.
+"zr decreases the foldlevel by one.
+"zR decreases the foldlevel to zero -- all folds will be open.
+"zd deletes the fold at the cursor.
+"zE deletes all folds.
+"[z move to start of open fold.
+"]z move to end of open fold.
+
+" fold form this bracket
+nmap <F10> zfa{<CR><CR>
+" unfold or use End
+nmap <S-F10> zo<CR><CR>
+
 
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