ipfs-test-lib: add shellquote()

[chriscool]

This function can be usefull in many places.

See for example:

#1742

Git has git rev-parse --sq-quote that does the same thing.

License: MIT
Signed-off-by: Christian Couder [email protected]

[ion1]

In hindsight, it might actually be nicer to do this instead:

        printf '%s'\' "$_space"
        printf '%s' "$_arg" | sed -e "s/'/'\\\\''/g"
        printf \'

[ion1]

In fact, my original implementation is just plain wrong, the above should work correctly. Sorry for that. Here’s a test script:

shellquote() {
    _space=''
    for _arg
    do
#       printf '%s'\' "$_space"
#       printf '%s' "$_arg" | sed -e "s/'/'\\\\''/g"
#       printf \'

        printf '%s' "$_space"
        printf '%s' "$_arg" | sed -e "s/'/'\\\\''/g; s/^/'/; s/\$/'/;"

        _space=' '
    done
    printf '\n'
}

printf '%s\n' \''"foo\
bar'

eval "$(shellquote printf '%s\n' \''"foo\
bar')"

eval "$(git rev-parse --sq-quote printf '%s\n' \''"foo\
bar')"

[jbenet]

@ion1 @chriscool maybe let's add a test

[ion1]

Here’s something that could be used as a basis for a unit test.

shellquote() {
    _space=''
    for _arg
    do
        printf '%s'\' "$_space"
        printf '%s' "$_arg" | sed -e "s/'/'\\\\''/g"
        printf \'
        _space=' '
    done
    printf '\n'
}

# Some shells don’t like \000.
bytes_sans_NUL="$(
    printf '\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037\040\041\042\043\044%%\046\047\050\051\052\053\054\055\056\057\060\061\062\063\064\065\066\067\070\071\072\073\074\075\076\077\100\101\102\103\104\105\106\107\110\111\112\113\114\115\116\117\120\121\122\123\124\125\126\127\130\131\132\133\134\135\136\137\140\141\142\143\144\145\146\147\150\151\152\153\154\155\156\157\160\161\162\163\164\165\166\167\170\171\172\173\174\175\176\177\200\201\202\203\204\205\206\207\210\211\212\213\214\215\216\217\220\221\222\223\224\225\226\227\230\231\232\233\234\235\236\237\240\241\242\243\244\245\246\247\250\251\252\253\254\255\256\257\260\261\262\263\264\265\266\267\270\271\272\273\274\275\276\277\300\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317\320\321\322\323\324\325\326\327\330\331\332\333\334\335\336\337\340\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357\360\361\362\363\364\365\366\367\370\371\372\373\374\375\376\377'
)"

test "$(eval "$(shellquote printf '%s' "$bytes_sans_NUL")" | sha256sum -b)" = "929351ec9c272028c6c70f92a33c69059639c1ef81d7baea0650552d39730266 *-"

[chriscool]

Ok, I will add some tests. Thanks @ion1!