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#!/bin/bash
### ariketa helper functions
# establish key bindings in current session
## accepts split string arrays or strings, one array or string per binding
_bindings.load_from_arrays () {
local _binding
for _binding; do
declare -n _binding_array="${_binding}"
bind "${_binding_array[*]}"
done
}
_example.highlight () {
hl < <(echo "${_examples[$_I]}")
}
### prompt / tagging helpers
#custom tag:value tuple handlers for _examples array
## tag delineator is ":\n"
_example.unpack() {
printf "%s" "${1#*:$'\n'}"
}
_tag.unpack() {
local _tag="${1%%:$'\n'*}"
(( ${#_tag} < ${#1} )) || return 1
printf "%s" "$_tag"
}
#presentation page header prompt display functions
## specify custom indicator as argument, '+' is default
_ps2.swap () {
local _cur_ps2="${PS2}"
PS2="$_old_ps2"
_old_ps2="$_cur_ps2"
}
_tag.same_as_next? () {
[[ "$(_tag.unpack "${_examples[$_I]}")" \
== "$(_tag.unpack "${_examples[$((_I+1))]}")" ]] \
|| return 1
printf "%s" "${1:-+}"
}
_tag.same_as_prev? () {
[[ "$(_tag.unpack "${_examples[$_I]}")" \
== "$(_tag.unpack "${_examples[$((_I-1))]}")" ]] \
|| return 1
printf "%s" "${1:-+}"
}
_tag.display () {
local _tag=$(_tag.unpack "${_examples[$_I]}") \
&& printf "[$(_tag.same_as_prev?) %s $(_tag.same_as_next?)]" "${_tag}"
}
### public functions
#simple bash code highlighting if the 'highlight' program is installed
## http://www.andre-simon.de/doku/highlight/en/highlight.php
hl () {
local hl=$(which highlight 2>/dev/null) || {
printf "%s\n" "${@}"
return
}
"$hl" --syntax bash -O xterm256 "${@}"
}
#diff between adjacent examples
ydiff () {
diff -wyW${COLUMNS:-80} \
<(echo "${_examples[(( _I - ${1:-1} ))]}") \
<(echo "${_examples[(( _I ))]}")
local diff_err=$?
(( diff_err <= 1 )) || return $diff_err
return 0
}
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