1 " Enable folding for ftrace function_graph traces.
2 "
3 " To use, :source this file while viewing a function_graph trace, or use vim's
4 " -S option to load from the command-line together with a trace. You can then
5 " use the usual vim fold commands, such as "za", to open and close nested
6 " functions. While closed, a fold will show the total time taken for a call,
7 " as would normally appear on the line with the closing brace. Folded
8 " functions will not include finish_task_switch(), so folding should remain
9 " relatively sane even through a context switch.
10 "
11 " Note that this will almost certainly only work well with a
12 " single-CPU trace (e.g. trace-cmd report --cpu 1).
13
14 function! FunctionGraphFoldExpr(lnum)
15 let line = getline(a:lnum)
16 if line[-1:] == '{'
17 if line =~ 'finish_task_switch() {$'
18 return '>1'
19 endif
20 return 'a1'
21 elseif line[-1:] == '}'
22 return 's1'
23 else
24 return '='
25 endif
26 endfunction
27
28 function! FunctionGraphFoldText()
29 let s = split(getline(v:foldstart), '|', 1)
30 if getline(v:foldend+1) =~ 'finish_task_switch() {$'
31 let s[2] = ' task switch '
32 else
33 let e = split(getline(v:foldend), '|', 1)
34 let s[2] = e[2]
35 endif
36 return join(s, '|')
37 endfunction
38
39 setlocal foldexpr=FunctionGraphFoldExpr(v:lnum)
40 setlocal foldtext=FunctionGraphFoldText()
41 setlocal foldcolumn=12
42 setlocal foldmethod=expr
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