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Re: [O] [0] Run org-babel src block periodically

From: John Kitchin
Subject: Re: [O] [0] Run org-babel src block periodically
Date: Sun, 03 Jan 2016 17:30:20 -0500
User-agent: mu4e 0.9.13; emacs

This is kind of close to what you want I think (at least it updates
every 5 seconds for me, 5 times before it stops). You might adapt it to
do what you want.

This is the block to run periodically.
#+name: time-string
top -o "cpu" -ncols 4 -l 1| head -n 15

#+RESULTS: time-string
Sun Jan  3 17:28:27 EST 2016
Processes: 225 total, 2 running, 3 stuck, 220 sleeping, 1110 threads
2016/01/03 17:28:27
Load Avg: 1.20, 1.51, 1.55
CPU usage: 5.0% user, 22.50% sys, 72.50% idle
SharedLibs: 14M resident, 12M data, 0B linkedit.
MemRegions: 57263 total, 3092M resident, 72M private, 450M shared.
PhysMem: 6508M used (1098M wired), 1246M unused.
VM: 588G vsize, 1067M framework vsize, 6471076(0) swapins, 6831574(0) swapouts.
Networks: packets: 190809878/201G in, 277243826/231G out.
Disks: 11873268/180G read, 10075469/265G written.

96378  com.apple.InputM 0.0  00:00.26
96376  AppleSpell       0.0  00:00.68
96015  head             0.0  00:00.00

This function will update that block. We increment a counter and cancel the 
timer when it is exceeded.
#+BEGIN_SRC emacs-lisp
(defun update-src-block (fname src-name N)
  "Update the src-block named SRC-NAME in the file FNAME upto N times."
  (if (> *counter* N)
      (progn (cancel-timer *timer*)
             (message-box "Done with timer"))
      (with-current-buffer  (find-file-noselect fname)
        (org-babel-goto-named-src-block src-name)
        (incf *counter*)))))

: update-src-block

We use a global var for the counter and timer.
#+BEGIN_SRC emacs-lisp
(setq *counter* 0)
(setq *timer* (run-with-timer
               nil 5

: [nil 22153 41074 708648 5 update-src-block 
("/Users/jkitchin/blogofile-jkitchin.github.com/_blog/blog.org" "time-string" 
5) nil 0]

Giri Prashanth writes:

> Hi,
> I would like to run a org-src block code periodically, is there any
> property for org-blocks for such repeated execution.
> For example if I want to watch the tail of a file periodically every 1 min
> for next 1 hour, I would like to set a property like repeat for times to
> repeat and keep the org file auto updated
> #+BEGIN_SRC shell :repeat 60 :repeat-every 60sec
> tail -n 10 file
> Thank you,
> -GP

Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213

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