docs: updated readme

README.md

@@ -23,31 +23,11 @@
 
 ## What is it?
 
-Rocketry is a modern scheduling framework for Python 
-applications. It is simple, clean and extensive. It is 
-the automation engine that sets your Python programs alive.
+Rocketry is a modern statement-based scheduling framework 
+for Python. It is simple, clean and extensive.
+It is suitable for small and big projects.
 
-The library is minimal on the surface but large 
-and highly customizable underneath. The syntax very clean:
-
-```python
-from rocketry import Rocketry
-
-app = Rocketry()
-
-@app.task('daily')
-def do_daily():
-    ...
-
-if __name__ == '__main__':
-    app.run()
-```
-
-<details markdown="1">
-<summary>Dislike the string syntax?</summary>
-
-There is also a condition API which is almost
-identical to the string syntax:
+This is how it looks like:
 
 ```python
 from rocketry import Rocketry
@@ -63,19 +43,11 @@ if __name__ == '__main__':
     app.run()
 ```
 
-</details>
-
-
-Compared to alternatives, Rocketry has the most elegant syntax and is the most productive. 
-It offers more features than Crontab or APScheduler but is much
-easier to work with than Airflow. It does not make assumptions of your project.
-
 Core functionalities:
 
-- Powerful scheduling syntax
-- A lot of built-in scheduling options
-- Task parallelization
-- Task parametrization
+- Powerful scheduling
+- Concurrency (async, threading, multiprocess)
+- Parametrization
 - Task pipelining
 - Modifiable session also in runtime
 - Async support
@@ -86,6 +58,33 @@ Links:
 - Source code: https://github.com/Miksus/rocketry
 - Releases: https://pypi.org/project/rocketry/
 
+## Why Rocketry?
+
+Unlike the alternatives, Rocketry's scheduler is 
+statement-based. Rocketry natively supports the 
+same scheduling strategies as the other options, 
+including cron and task pipelining, but it can also be
+arbitrarily extended using custom scheduling statements.
+
+Here is an example of custom conditions:
+
+```python
+from rocketry.conds import daily, time_of_week
+from pathlib import Path
+
+@app.cond()
+def file_exists(file):
+    return Path(file).exists()
+
+@app.task(daily.after("08:00") & file_exists("myfile.csv"))
+def do_work():
+    ...
+```
+
+Rocketry is suitable for quick automation projects
+and for larger scale applications. It does not make
+assumptions of your project structure.
+
 ## Installation
 
 Install Rocketry from [PyPI](https://pypi.org/project/rocketry/):
@@ -102,27 +101,10 @@ Here are some more examples of what it can do.
 **Scheduling:**
 
 ```python
-@app.task("every 10 seconds")
-def do_continuously():
-    ...
-
-@app.task("daily after 07:00")
-def do_daily_after_seven():
-    ...
-
-@app.task("hourly & time of day between 22:00 and 06:00")
-def do_hourly_at_night():
-    ...
-
-@app.task("(weekly on Monday | weekly on Saturday) & time of day after 10:00")
-def do_twice_a_week_after_ten():
-    ...
-```
-<details markdown="1">
-<summary>Same with condition API</summary>
-
-```python
-from rocketry.conds import every, daily, hourly, time_of_day, weekly
+from rocketry.conds import every
+from rocketry.conds import hourly, daily, weekly, 
+from rocketry.conds import time_of_day
+from rocketry.conds import cron
 
 @app.task(every("10 seconds"))
 def do_continuously():
@@ -136,32 +118,16 @@ def do_daily_after_seven():
 def do_hourly_at_night():
     ...
 
-@app.task((weekly.on("Monday") | weekly.on("Saturday")) & time_of_day.after("10:00"))
+@app.task((weekly.on("Mon") | weekly.on("Sat")) & time_of_day.after("10:00"))
 def do_twice_a_week_after_ten():
     ...
-```
-
-</details>
 
-
-**Pipelining tasks:**
-
-```python
-from rocketry.args import Return
-
-@app.task("daily after 07:00")
-def do_first():
-    ...
-    return 'Hello World'
-
-@app.task("after task 'do_first'")
-def do_second(arg=Return('do_first')):
-    # arg contains the value of the task do_first's return
+@app.task(cron("* 2 * * *"))
+def do_based_on_cron():
     ...
-    return 'Hello Python'
 ```
-<details markdown="1">
-<summary>Same with condition API</summary>
+
+**Pipelining tasks:**
 
 ```python
 from rocketry.conds import daily, after_success
@@ -173,31 +139,31 @@ def do_first():
     return 'Hello World'
 
 @app.task(after_success(do_first))
-def do_second(arg=Return(do_first)):
+def do_second(arg=Return('do_first')):
     # arg contains the value of the task do_first's return
     ...
     return 'Hello Python'
 ```
 
-</details>
-
 
 **Parallelizing tasks:**
 
 ```python
-@app.task("daily", execution="main")
+from rocketry.conds import daily
+
+@app.task(daily, execution="main")
 def do_unparallel():
     ...
 
-@app.task("daily", execution="async")
+@app.task(daily, execution="async")
 async def do_async():
     ...
 
-@app.task("daily", execution="thread")
+@app.task(daily, execution="thread")
 def do_on_separate_thread():
     ...
 
-@app.task("daily", execution="process")
+@app.task(daily, execution="process")
 def do_on_separate_process():
     ...
 ```