[O] Newb me wrote bash script for TOC, for Org-mode in Github repos.

[Brady Trainor]

I think I have an okay bash script (below) for producing a TOC for notes I keep 
in Github in Org-mode format. It produce bulleted links like

#+BEGIN_SRC org
 - [[./fileA.org][fileA.org]]
 - [[./dir][dir/]]
  - [[./dir/fileB.org][fileB.org]]
#+END_SRC

I run this script from a README.org file in my Github repo. My interaction with 
Github is a little frustrating, I think an extra blank line after =#+RESULTS:= 
prevents Github from omitting the entire list.

Here is the script, it's more-or-less a very early program in my side project 
to learn programming. I think I have some inconsistencies in choosing to "" 
quote things. But it doesn't seem to be a problem. Hopefully I can learn Perl 
one day so I can do it in one line ;).

I would have written it in Emacs Lisp since that is where I intended to use it, 
but I am still a little intimidated to learn this. Perhaps I will try to 
convert this to Emacs Lisp as an exercise at some point.

Any comments are appreciated! (The choice of indentation as spaces is not the 
Org-mode convention (1,2,3... instead of 0,2,4...), but I choose simplicity in 
my scripts for now.) 

#+BEGIN_SRC emacs-lisp
(setq org-babel-sh-command "bash")
#+END_SRC

#+BEGIN_SRC sh :results scalar raw replace
#!/bin/bash
echo
PrevDepth=1
PrevDir="."
find -regex '.*\.org' |
    while read file
    do
        Slashes="${file//[^\/]}"
        Depth="${#Slashes}"
        Dir=${file%/*}
        if [[ $Depth -eq $PrevDepth &&  "$Dir" != "$PrevDir" ]] || \
               [[ $Depth -gt $PrevDepth ]]
        then
            for (( i=1 ; i <= Depth-1 ; i++ )); do echo -n ' '; done
            echo "- [[$Dir][${Dir##*/}/]]"
        fi
        for (( i=1; i<=Depth; i++ )); do echo -n ' '; done
        echo -n "- [[$file][${file##*/}]]"
        echo
        PrevDepth=$Depth
        PrevDir=$Dir
    done
#+END_SRC


--
Brady