From c0def58b13c9364e0815f0c931a86ee199b30493 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kj@orbekk.com>
Date: Thu, 25 Nov 2021 10:54:40 -0500
Subject: Add word count exercise

---
 .../emacs-lisp/word-count/.exercism/config.json    | 23 ++++++++
 .../emacs-lisp/word-count/.exercism/metadata.json  |  1 +
 exercism/emacs-lisp/word-count/HELP.md             | 41 ++++++++++++++
 exercism/emacs-lisp/word-count/README.md           | 50 +++++++++++++++++
 exercism/emacs-lisp/word-count/word-count-test.el  | 65 ++++++++++++++++++++++
 exercism/emacs-lisp/word-count/word-count.el       | 28 ++++++++++
 6 files changed, 208 insertions(+)
 create mode 100644 exercism/emacs-lisp/word-count/.exercism/config.json
 create mode 100644 exercism/emacs-lisp/word-count/.exercism/metadata.json
 create mode 100644 exercism/emacs-lisp/word-count/HELP.md
 create mode 100644 exercism/emacs-lisp/word-count/README.md
 create mode 100644 exercism/emacs-lisp/word-count/word-count-test.el
 create mode 100644 exercism/emacs-lisp/word-count/word-count.el

diff --git a/exercism/emacs-lisp/word-count/.exercism/config.json b/exercism/emacs-lisp/word-count/.exercism/config.json
new file mode 100644
index 0000000..95e785a
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/.exercism/config.json
@@ -0,0 +1,23 @@
+{
+  "blurb": "Given a phrase, count the occurrences of each word in that phrase.",
+  "authors": [],
+  "contributors": [
+    "canweriotnow",
+    "npostavs",
+    "vermiculus",
+    "wasamasa",
+    "yurrriq"
+  ],
+  "files": {
+    "solution": [
+      "word-count.el"
+    ],
+    "test": [
+      "word-count-test.el"
+    ],
+    "example": [
+      ".meta/example.el"
+    ]
+  },
+  "source": "This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour."
+}
diff --git a/exercism/emacs-lisp/word-count/.exercism/metadata.json b/exercism/emacs-lisp/word-count/.exercism/metadata.json
new file mode 100644
index 0000000..b5d023f
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/.exercism/metadata.json
@@ -0,0 +1 @@
+{"track":"emacs-lisp","exercise":"word-count","id":"66b39ed799384512ac08213e176ac353","url":"https://exercism.org/tracks/emacs-lisp/exercises/word-count","handle":"orbekk","is_requester":true,"auto_approve":false}
\ No newline at end of file
diff --git a/exercism/emacs-lisp/word-count/HELP.md b/exercism/emacs-lisp/word-count/HELP.md
new file mode 100644
index 0000000..50effbd
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/HELP.md
@@ -0,0 +1,41 @@
+# Help
+
+## Running the tests
+
+Tests can be run several ways:
+
+1. Interactively and individually, with `M-x ert RET test-name RET`
+2. Interactively and all at once, with `M-x ert RET t RET`
+3. From the terminal, in batch mode, with `emacs -batch -l ert -l my-test.el -f ert-run-tests-batch-and-exit`
+4. Other options can be found in the docs, `C-h i m ert RET`
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit word-count.el` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Emacs Lisp track's documentation](https://exercism.org/docs/tracks/emacs-lisp)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [The Emacs Wiki](http://emacswiki.org/) is invaluable. Spend lots of time here.
+- [The Emacs Editor](http://www.gnu.org/software/emacs/manual/html_node/emacs/index.html) is the official manual for GNU Emacs.
+- IRC - there are [freenode](https://freenode.net/) channels for `#emacs`, `#prelude`, and many Emacs
+  packages, and many helpful folks around. And with emacs, IRC is as close as
+  `M-x erc`.
+- [Exercism Support](https://gitter.im/exercism/support) Gitter chat is also a good place to get help from the
+  exercism community.
+- [StackOverflow](http://stackoverflow.com/questions/tagged/elisp) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.
\ No newline at end of file
diff --git a/exercism/emacs-lisp/word-count/README.md b/exercism/emacs-lisp/word-count/README.md
new file mode 100644
index 0000000..cf536c4
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/README.md
@@ -0,0 +1,50 @@
+# Word Count
+
+Welcome to Word Count on Exercism's Emacs Lisp Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a phrase, count the occurrences of each _word_ in that phrase.
+
+For the purposes of this exercise you can expect that a _word_ will always be one of:
+
+1. A _number_ composed of one or more ASCII digits (ie "0" or "1234") OR
+2. A _simple word_ composed of one or more ASCII letters (ie "a" or "they") OR
+3. A _contraction_ of two _simple words_ joined by a single apostrophe (ie "it's" or "they're")
+
+When counting words you can assume the following rules:
+
+1. The count is _case insensitive_ (ie "You", "you", and "YOU" are 3 uses of the same word)
+2. The count is _unordered_; the tests will ignore how words and counts are ordered
+3. Other than the apostrophe in a _contraction_ all forms of _punctuation_ are ignored
+4. The words can be separated by _any_ form of whitespace (ie "\t", "\n", " ")
+
+For example, for the phrase `"That's the password: 'PASSWORD 123'!", cried the Special Agent.\nSo I fled.` the count would be:
+
+```text
+that's: 1
+the: 2
+password: 2
+123: 1
+cried: 1
+special: 1
+agent: 1
+so: 1
+i: 1
+fled: 1
+```
+
+## Source
+
+### Contributed to by
+
+- @canweriotnow
+- @npostavs
+- @vermiculus
+- @wasamasa
+- @yurrriq
+
+### Based on
+
+This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.
\ No newline at end of file
diff --git a/exercism/emacs-lisp/word-count/word-count-test.el b/exercism/emacs-lisp/word-count/word-count-test.el
new file mode 100644
index 0000000..1029b68
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/word-count-test.el
@@ -0,0 +1,65 @@
+;;; word-count-test.el --- Tests for word-count (exercism)
+
+;;; Commentary:
+
+;;; Code:
+
+(load-file "word-count.el")
+
+
+(defun equal-assoc (a b)
+  (let ((strcmp (lambda (a b) (not (string< (car a) (car b))))))
+    (equal (sort (copy-sequence a) strcmp)
+           (sort (copy-sequence b) strcmp))))
+
+
+(ert-deftest no-words-test ()
+  (should (equal-assoc (word-count "")
+                       nil)))
+
+
+(ert-deftest count-one-word-test ()
+  (should (equal-assoc (word-count "word")
+                       '(("word" . 1)))))
+
+
+(ert-deftest count-one-of-each-word-test ()
+  (should (equal-assoc (word-count "one of each")
+                       '(("each" . 1)
+                         ("of" . 1)
+                         ("one" . 1)))))
+
+
+(ert-deftest multiple-occurrences-of-a-word-test ()
+  (should (equal-assoc (word-count "one fish two fish red fish blue fish")
+                       '(("blue" . 1)
+                         ("red" . 1)
+                         ("two" . 1)
+                         ("fish" . 4)
+                         ("one" . 1)))))
+
+
+(ert-deftest ignore-punctuation-test ()
+  (should (equal-assoc (word-count "car : carpet as java : javascript!!&@$%^&")
+                       '(("javascript" . 1)
+                         ("java" . 1)
+                         ("as" . 1)
+                         ("carpet" . 1)
+                         ("car" . 1)))))
+
+
+(ert-deftest include-numbers-test ()
+  (should (equal-assoc (word-count "testing, 1, 2 testing")
+                       '(("2" . 1)
+                         ("1" . 1)
+                         ("testing" . 2)))))
+
+
+(ert-deftest normalize-case-test ()
+  (should (equal-assoc (word-count "go Go GO Stop stop")
+                       '(("stop" . 2)
+                         ("go" . 3)))))
+
+
+(provide 'word-count)
+;;; word-count-test.el ends here
diff --git a/exercism/emacs-lisp/word-count/word-count.el b/exercism/emacs-lisp/word-count/word-count.el
new file mode 100644
index 0000000..bd51772
--- /dev/null
+++ b/exercism/emacs-lisp/word-count/word-count.el
@@ -0,0 +1,28 @@
+;;; word-count.el --- word-count Exercise (exercism)
+
+;;; Commentary:
+
+(require 'cl-extra)
+
+;;; Code:
+(defun kj/extract-words (str)
+  (let ((pos 0)
+        (result nil))
+    (while (string-match "[[:blank:]'\"]*\\([[:alnum:]']+\\)" str pos)
+      (setq pos (match-end 1))
+      (push (match-string 1 str) result))
+    (nreverse result)))
+
+(defun word-count (str)
+  (let* ((table (make-hash-table :test 'equal))
+         (result nil)
+         (count-word (lambda (w)
+                       (setq w (downcase w))
+                       (let ((count (gethash w table 0)))
+                         (puthash w (1+ count) table))))
+         (push-output (lambda (w c)
+                        (push (cons w c) result))))
+    (cl-mapc count-word (kj/extract-words str))
+    (maphash push-output table)
+    result))
+;;; word-count.el ends here
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