#+Title: a collection of examples for ob-shell tests
#+OPTIONS: ^:nil

* Sample data structures
#+NAME: sample_array
| one   |
| two   |
| three |

#+NAME: sample_mapping_table
| first  | one   |
| second | two   |
| third  | three |

#+NAME: sample_big_table
| bread     |  2 | kg |
| spaghetti | 20 | cm |
| milk      | 50 | dl |

* Array tests
  :PROPERTIES:
  :ID:       0ba56632-8dc1-405c-a083-c204bae477cf
  :END:
** Generic shell: no arrays
#+begin_src sh :exports results :var array=sample_array
echo ${array}
#+end_src

#+RESULTS:
: one two three

** Bash shell: support for arrays
Bash will see a simple indexed array. In this test, we check that the
returned value is indeed only the first item of the array, as opposed to
the generic serialiation that will return all elements of the array as 
a single string.
#+begin_src bash :exports results :var array=sample_array
echo ${array}
#+end_src

#+RESULTS:
: one


* Associative array tests (simple map)
  :PROPERTIES:
  :ID:       bec1a5b0-4619-4450-a8c0-2a746b44bf8d
  :END:
** Generic shell: no special handing
The shell will see all values as a single string.
#+begin_src sh :exports results :var table=sample_mapping_table
echo ${table}
#+end_src

#+RESULTS:
: first one second two third three


** Bash shell: support for associative arrays
Bash will see a table that contains the first column as the 'index'
of the associative array, and the second column as the value.
#+begin_src bash :exports results :var table=sample_mapping_table
echo ${table[second]}
#+end_src

#+RESULTS:
: two


* Associative array tests (more than 2 columns)
  :PROPERTIES:
  :ID:       82320a48-3409-49d7-85c9-5de1c6d3ff87
  :END:
** Generic shell: no special handing
#+begin_src sh :exports results :var table=sample_big_table
echo ${table}
#+end_src

#+RESULTS:
: bread 2 kg spaghetti 20 cm milk 50 dl

   
** Bash shell: support for associative arrays with lists
Bash will see an associative array that contains each row as a single
string. Bash cannot handle lists in associative arrays.
#+begin_src bash :exports results :var table=sample_big_table
echo ${table[spaghetti]}
#+end_src

#+RESULTS:
: 20 cm

** Bash shell: iterate over keys of associative array
Bash will see an associative array that contains each row as a single
string. Iterate over the keys.
#+begin_src bash :exports results :var table=sample_mapping_table
#echo ${table[spaghetti]}

for i in "${!table[@]}"
do
  echo "$i" ${table[$i]}
done
#+end_src

#+RESULTS:
| third  | three |
| second | two   |
| first  | one   |








