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bash/anagram/README.md

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+# Anagram
+
+An anagram is a rearrangement of letters to form a new word.
+Given a word and a list of candidates, select the sublist of anagrams of the given word.
+
+Given `"listen"` and a list of candidates like `"enlists" "google"
+"inlets" "banana"` the program should return a list containing
+`"inlets"`.
+
+
+Run the tests with:
+
+```bash
+bats anagram_test.sh
+```
+
+After the first test(s) pass, continue by commenting out or removing the
+`[[ $BATS_RUN_SKIPPED == true ]] || skip` 
+annotations prepending other tests.
+
+To run all tests, including the ones with `skip` annotations, run:
+
+```bash
+BATS_RUN_SKIPPED=true bats anagram_test.sh
+```
+
+## Source
+
+Inspired by the Extreme Startup game [https://github.com/rchatley/extreme_startup](https://github.com/rchatley/extreme_startup)
+
+
+## External utilities
+`Bash` is a language to write "scripts" -- programs that can call
+external tools, such as
+[`sed`](https://www.gnu.org/software/sed/),
+[`awk`](https://www.gnu.org/software/gawk/),
+[`date`](https://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html)
+and even programs written in other programming languages, 
+like [`Python`](https://www.python.org/).
+This track does not restrict the usage of these utilities, and as long
+as your solution is portable between systems and does not require
+installation of third party applications, feel free to use them to solve
+the exercise.
+
+For an extra challenge, if you would like to have a better understanding
+of the language, try to re-implement the solution in pure `Bash`,
+without using any external tools. Note that there are some types of
+problems that bash cannot solve, such as performing floating point
+arithmetic and manipulating dates: for those, you must call out to an
+external tool.
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others
+have completed the exercise.

bash/anagram/anagram.sh

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+#!/usr/bin/env bash
+#
+# External tools: none.
+# Subshells: none.
+#
+# V1: initial version
+
+shopt -s extglob
+
+# set to mask to enable logs. 0: none, 255: all
+(( debug=2#00000000 ))
+(( debug=2#00001111 ))
+# $1: log level (mask), then strings to display.
+debug () {
+    (( debug & $1 )) && shift && echo Line ${BASH_LINENO[0]}: "${@}" >&2
+    #local -i i
+    #if (( debug & $1 )) ; then
+    #    for ((i=1; i<$1; ++i)); do
+    #        echo -n " "
+    #    done
+    #    shift
+    #    echo "${BASH_LINENO[0]}: ${@}" >&2
+    #fi
+}
+
+die () {
+    echo "${@}" >&2
+    exit 1
+}
+usage() {
+    die "usage: anagram.sh word anagrams-list"
+}
+
+# check for basic args
+(($# < 2)) && usage
+word="$1"
+shift
+# we will accept more than 1 anagram list:
+# anagram.sh "BANANA" "banana BANANA" = anagram "BANANA" "banana" "BANANA"
+# we start to split words
+declare -a words
+while (($# > 0)); do
+    words=("${words[@]}" $1)
+    typeset -p words
+    shift
+done
+debug 1 words=${#words[@]}:${words[@]}
+typeset -p words
+
+
+exit 0
+
+# emacs/vim settings.
+# Local Variables:
+# sh-basic-offset: 4
+# indent-tabs-mode: nil
+# comment-column: 40
+# fill-column: 80
+# End:
+# vim: set tabstop=4 expandtab: