vim: add Man and Cmd functions

- `:Man <cmd>` opens the man of `cmd` in a new buffer
- `:Cmd <cmd>` executes `cmd` and shows the output in a new scratch
  buffer

vim/functions.vim

@@ -90,3 +90,61 @@ function! GitStatus()
   let [a,m,r] = GitGutterGetHunkSummary()
   return printf('+%d ~%d -%d', a, m, r)
 endfunction
+
+
+" Redirect command into scractch buffer. Stolen from romainl
+function! Redir(cmd, rng, start, end)
+    for win in range(1, winnr('$'))
+        if getwinvar(win, 'scratch')
+            execute win . 'windo close'
+        endif
+    endfor
+    if a:cmd =~ '^!'
+        let cmd = a:cmd =~' %'
+            \ ? matchstr(substitute(a:cmd, ' %', ' ' . expand('%:p'), ''), '^!\zs.*')
+            \ : matchstr(a:cmd, '^!\zs.*')
+        if a:rng == 0
+            let output = systemlist(cmd)
+        else
+            let joined_lines = join(getline(a:start, a:end), '\n')
+            let cleaned_lines = substitute(shellescape(joined_lines), "'\\\\''", "\\\\'", 'g')
+            let output = systemlist(cmd . " <<< $" . cleaned_lines)
+        endif
+    else
+        redir => output
+        execute a:cmd
+        redir END
+        let output = split(output, "\n")
+    endif
+    vnew
+    let w:scratch = 1
+    setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile
+    call setline(1, output)
+endfunction
+
+command! -nargs=1 -complete=command -bar -range Redir silent call Redir(<q-args>, <range>, <line1>, <line2>)
+
+" Gets the manul page for the given command
+function! Man(cmd)
+    let output = system('env PAGER="bat -p" man ' . a:cmd)
+    vnew
+    let w:scratch=1
+    setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile
+    setlocal nonumber norelativenumber
+    call setline(1, split(output, '\n'))
+endfunction
+
+command! -nargs=1 -complete=command Man silent call Man(<q-args>)
+
+" Execute the given command and print it in a scratch buffer
+function! Cmd(cmd)
+    let output = system(a:cmd)
+    vnew
+    let w:scratch=1
+    " setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile
+    setlocal buftype=popup bufhidden=wipe nobuflisted noswapfile
+    setlocal nonumber norelativenumber
+    call setline(1, split(output, '\n'))
+endfunction
+
+command! -nargs=1 -complete=command Cmd silent call Cmd(<q-args>)