Show function name in status line

Question

I edit a large C, C++, or Java file, say, about 15000 lines, with pretty long function definitions, say, about 400 lines. When the cursor is in middle of a function definition, it would be cool to see the function name in Vim status line.

When we set :set ls=2 in Vim, we can get the file path (relative to the current directory), line number, etc. It would be really cool if we could see the function name too. Any ideas how to get it?

Currently I use [[ to go to start of the function and Ctrl-O to get back to the line I'm editing.

Answer 1

To show current function name in C programs add following in your vimrc:

fun! ShowFuncName()
  let lnum = line(".")
  let col = col(".")
  echohl ModeMsg
  echo getline(search("^[^ \t#/]\\{2}.*[^:]\s*$", 'bW'))
  echohl None
  call search("\\%" . lnum . "l" . "\\%" . col . "c")
endfun
map f :call ShowFuncName() <CR>

Or if you need the "f" key, just map the function to whatever you like.

Answer 2

You can use ctags.vim for this, it will show the current function name in the title or status bar.

SOURCE: https://superuser.com/questions/279651/how-can-i-make-vim-show-the-current-class-and-method-im-editing

Answer 3

Based on @manav m-n's answer

The 'n' flag in search() won't move the cursor, so a shorter version of this with the same functionality would be:

fun! ShowFuncName()
  echohl ModeMsg
  echo getline(search("^[^ \t#/]\\{2}.*[^:]\s*$", 'bWn'))
  echohl None
endfun
map f :call ShowFuncName() <CR>

Reference: run :help search()

Answer 4

There are several plugins for status line or on-demand with a mapping, e.g.:

• http://www.vim.org/scripts/script.php?script_id=1094
• http://www.vim.org/scripts/script.php?script_id=2805
• http://www.vim.org/scripts/script.php?script_id=1553