Re: Insert lines at begin of file with writefile

Le mardi 30 mai 2017 13:29:10 UTC+2, ZyX a écrit :
> 2017-05-30 14:21 GMT+03:00 Ni Va <nivaemail@gmail.com>:
> > Le mardi 30 mai 2017 13:03:38 UTC+2, ZyX a écrit :
> >> 2017-05-30 11:21 GMT+03:00 Ni Va <nivaemail@gmail.com>:
> >> > Hi,
> >> >
> >> >
> >> > Is that a way to tell writefile() func to append lines at the beginning of file?
> >>
> >> Just read the whole file, prepend and then write the whole file. In
> >> any case I do not know a way to actually prepend bytes to the file: if
> >> you seek to the end of file (or open it in append mode) and start
> >> writing to it you get appending. If you seek to the start and start
> >> writing you will just overwrite first bytes. So programming languages
> >> do not have "prepending" abstraction because it is not supported by
> >> the OS and thus is going to either cost very much or have problems
> >> like loosing data on crashes.
> >>
> >> >
> >> > Thank you
> >> > Niva
> >> >
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> >
> > Do you think readfile writefile would be faster than that :
> >
> > let begin = [$vimruntime."/gvim.exe", "-c", "edit ".makefile, "-c",
> > \"call append(0, ".string(lines2Append).")", "-c", "wq"]
> > call x.add_cmd(begin) " ==>>>> Launch cmd as job
>
> With readfile+writefile you load a file into memory and write there.
> With gvim you are forking, loading gvim.exe and a big bunch of
> libraries needed for GUI, loading a file into memory (though buffer
> structure should be a bit more efficient then a list from `readfile()`
> AFAIK), loading a big bunch of plugins (do not do such things without
> `-u NONE -i NONE`), loading GUI (use `--cmd` for such things, not
> `-c`). Which is faster? Actually may be your variant if you do not
> need to wait for gvim to finish prepending because time would be
> limited to only forking. readfile()+writefile() if you do need to
> wait.
>
> >
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Ok applying your advise it is sure the radfile writefile method is amazing faster in binary mode.

Then this method 2 below can be done by job_start( ?

Thank you



" add append lines
let lines2Append = [
\ expand("SDK_INCLUDE_DIR=$ProgramFiles (x86)/Windows Kits/8.1/Include")
\, expand("VS_DIR=$ProgramFiles (x86)/Microsoft Visual Studio 14.0/VC")
\, 'CPU=AMD64'
\, 'FEATURES=HUGE'
\, 'OLE=yes'
\, 'GUI=yes'
\, 'XPM=no'
\, 'NETBEANS=no'
\, 'CSCOPE=no'
\, 'MBYTE=yes'
\, 'DYNAMIC_LUA=yes'
\, 'LUA=.\\lua53'
\, 'LUA_VER=53'
\, 'DYNAMIC_PYTHON=yes'
\, 'PYTHON=C:\Python27'
\, 'PYTHON_VER=27'
\, 'DYNAMIC_PYTHON3=no'
\, 'PYTHON3='
\, 'PYTHON3_VER='
\, 'EVENT_LOOP=yes'
\, '
'
\]
" method 1 : slow to add lines but job able
let cmd = [$vimruntime."/gvim.exe", "-c", "edit ".makefile, "-c",
\"call append(0, ".string(lines2Append).")", "-c", "wq"]
" call x.add_cmd(cmd) "started as job by job_start( and handlers


" method 2 : faster but no job able ??!?
let originalFile = readfile(makefile,'b')
call writefile( lines2Append, makefile, 'b')
call writefile( originalFile, makefile, 'a')

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