Merge pull request #60 from saleyn/master

Fix several bugs

Rewrite of core

.travis.yml

@@ -1,12 +1,9 @@
 sudo: false
 language: erlang
 otp_release:
-       - R15B03
-       - R16B03-1
-       - 17.5
-       - 18.0
-       - 18.1
-       - 19.0
+       - 20.0
+       - 21.0
+       - 22.0
 
 before_script: "make get-deps"
 script: "make test"

README.md

@@ -19,17 +19,19 @@ does.  Each job is assigned to a single (Erlang) process.  The time
 until it is to run next is calculated, and the process sleeps for
 exactly that long.
 
-Unlike cron's one-minute resolution, erlcron has a 2-second resolution
-(actually 1 second, but after running the job, the process waits an
-extra second to avoid accidentally running it more than once.)
+Unlike cron's one-minute resolution, erlcron has a millisecond resolution.
 
-It does not handle Daylight Savings Time (or other cases when the
-system clock is altered) gracefully, and it is recommended that it be
-stopped and restarted on such occasions.
+It does handle Daylight Savings Time changes (but not the cases when the
+system clock is altered by small increments, in which case the next
+execution of a scheduled task may be imprecise).
 
 Cron Job Description Examples:
 
 ```erlang
+{{once, {3, 30, pm}, fun() -> io:fwrite("Hello world!~n") end}
+
+{{once, {3, 30, pm}, fun(JobRef, CurrDateTime) -> io:fwrite("Hello world!~n") end}
+
 {{once, {3, 30, pm}},
     {io, fwrite, ["Hello, world!~n"]}}
 
@@ -54,14 +56,30 @@ Cron Job Description Examples:
 {{weekly, wed, {2, am}},
     {fun() -> io:fwrite("It's 2 Wednesday morning~n") end}
 
+{{weekly, [tue,wed], {2, am}},
+    {fun(_, Now) -> io:format("Now is ~p~n", [Now]) end}
+
 {{weekly, fri, {2, am}},
     {io, fwrite, ["It's 2 Friday morning~n"]}}
 
 {{monthly, 1, {2, am}},
     {io, fwrite, ["First of the month!~n"]}}
 
+{{monthly, [1, 7, 14], {2, am}},
+    {io, fwrite, ["Every 1st, 7th, 14th of the month!~n"]}}
+
+{{monthly, 0, {2, am}},
+    {io, fwrite, ["Last day of the month!~n"]}}
+
+{{monthly, [0, -1], {2, am}},
+    {io, fwrite, ["Last two days of the month!~n"]}}
+
 {{monthly, 4, {2, am}},
     {io, fwrite, ["Fourth of the month!~n"]}}
+
+%% Days of month less or equal to zero are subtracted from the end of the month
+{{monthly, 0, {2, am}},
+    {io, fwrite, ["Last day of the month!~n"]}}
 ```
 
 Adding a cron to the system:
@@ -73,15 +91,21 @@ Job = {{weekly, thu, {2, am}},
 erlcron:cron(Job).
 ```
 
+Cron jobs can be given named atom references:
+
+```erlang
+erlcron:cron(test_job1, {{once, {3,pm}}, {io, fwrite, "It's 3pm"}}).
+```
+
 A simple way to add a daily cron:
 
-    erlcron:at({3, 30, pm}, Fun).
+    erlcron:daily({3, 30, pm}, Fun).
 
 A simple way to add a job that will be run once in the future. Where
 'once' is the number of seconds until it runs.
 
 ```erlang
-erlcron:once(300, Fun).
+erlcron:at(300, Fun).
 ```
 
 Cancel a running job.
@@ -90,7 +114,7 @@ Cancel a running job.
 erlcron:cancel(JobRef).
 ```
 
-Get the current date time of the system.
+Get the current reference (univeral) date time of the system.
 
 ```erlang
 erlcron:datetime().

rebar.config

@@ -1,11 +1,9 @@
 %% -*- mode: Erlang; fill-column: 80; comment-column: 75; -*-
 %% Dependencies ================================================================
-{deps, [{rebar_vsn_plugin, ".*",
-         {git, "https://github.com/erlware/rebar_vsn_plugin.git",
-          {tag, "master"}}}]}.
+{deps, []}.
 
 %% Rebar Plugins ==============================================================
-{plugins, [rebar_vsn_plugin]}.
+{plugins, []}.
 
 %% Compiler Options ============================================================
 {erl_opts,