Most remote presentation controllers use PageUp and PageDown to trigger slide changes.

It should be easy to add support for those keys to switch slides in Present, and claim basic compatibility with those devices!

When I am trying to use this package in Mac OS, Its showing this error:

Traceback (most recent call last):
                                    File "/Users/vasudevgupta/miniconda3/envs/insights/bin/present", line 8, in <module>
                                                                                                                            sys.exit(cli())
                                                                                                                                             File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/click/core.py", line 829, in __call__
                                                                                   return self.main(*args, **kwargs)
                                                                                                                      File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/click/core.py", line 782, in main
                                                        rv = self.invoke(ctx)
                                                                               File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
                    return ctx.invoke(self.callback, **ctx.params)
                                                                    File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/click/core.py", line 610, in invoke
        return callback(*args, **kwargs)
                                          File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/present/cli.py", line 20, in cli
                                                                                                                                                             with Slideshow(slides) as show:
            File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/present/slideshow.py", line 90, in __enter__
                                                                                                                                           self.screen = Screen.open()
                                                                                                                                                                        File "/Users/vasudevgupta/miniconda3/envs/insights/lib/python3.7/site-packages/asciimatics/screen.py", line 1294, in open
                                                                                                                   curses.cbreak()
                                                                                                                                  _curses.error: cbreak() returned ERR

What can be the possible reason??

Thanks

Thank you for this fun and interesting project.

I'm hitting an error when using inline code:

Hello `World`

leads to

Traceback (most recent call last):
  File "/home/clemisch/.local/lib/python3.6/site-packages/present/markdown.py", line 242, in parse
    Element = eval(element_name)
  File "<string>", line 1, in <module>
NameError: name 'Codespan' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/clemisch/.local/bin/present", line 8, in <module>
    sys.exit(cli())
  File "/home/clemisch/.local/lib/python3.6/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/clemisch/.local/lib/python3.6/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/clemisch/.local/lib/python3.6/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/clemisch/.local/lib/python3.6/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/clemisch/.local/lib/python3.6/site-packages/present/cli.py", line 18, in cli
    slides = markdown.parse(f.read())
  File "/home/clemisch/.local/lib/python3.6/site-packages/present/markdown.py", line 245, in parse
    f"(Slide {sliden + 1}) {element_name} is not supported"
ValueError: (Slide 1) Codespan is not supported

Hi! I recently made a presentation using present and figured it would be nice to get it added to the gallery. The presentation is about trustless blockchain bridges built using the Substrate blockchain building framework. Bridges are a way to connect different blockchains without a trusted central party. The slides can be found here.

I had a lot of fun making the slides with present - will definitely be using it again in the future!

D:\python\docs\report>present navicat.md Traceback (most recent call last): File "c:\users\administrator\appdata\local\programs\python\python38\lib\runpy.py", line 194, in _run_module_as_main return _run_code(code, main_globals, None, File "c:\users\administrator\appdata\local\programs\python\python38\lib\runpy.py", line 87, in run_code exec(code, run_globals) File "C:\Users\Administrator\AppData\Local\Programs\Python\Python38\Scripts\present.exe_main.py", line 7, in File "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\click\core.py", line 829, in call return self.main(*args, **kwargs) File "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\click\core.py", line 782, in main rv = self.invoke(ctx) File "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\click\core.py", line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\click\core.py", line 610, in invoke return callback(*args, **kwargs) File "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\present\cli.py", line 18, in cli slides = markdown.parse(f.read()) UnicodeDecodeError: 'gbk' codec can't decode byte 0xaf in position 32: illegal multibyte sequence

I have python 3.8.5 installed on macOS Mojave, it looks like present is trying to use the python 3.7 interpreter even though it isn't present.

➜  python --version
Python 3.8.5
➜  pip3 install present
Collecting present
  Using cached present-0.5.0-py3-none-any.whl (15 kB)
Requirement already satisfied: pyfiglet>=0.8.post1 in /usr/local/lib/python3.8/site-packages (from present) (0.8.post1)
Requirement already satisfied: PyYAML>=5.3.1 in /usr/local/lib/python3.7/site-packages (from present) (5.3.1)
Requirement already satisfied: asciimatics>=1.11.0 in /usr/local/lib/python3.8/site-packages (from present) (1.11.0)
Requirement already satisfied: Click>=7.0 in /usr/local/lib/python3.7/site-packages (from present) (7.1.1)
Requirement already satisfied: mistune>=2.0.0a4 in /usr/local/lib/python3.8/site-packages (from present) (2.0.0a4)
Requirement already satisfied: future in /usr/local/lib/python3.7/site-packages (from asciimatics>=1.11.0->present) (0.18.2)
Requirement already satisfied: Pillow>=2.7.0 in /usr/local/lib/python3.7/site-packages (from asciimatics>=1.11.0->present) (7.0.0)
Requirement already satisfied: wcwidth in /usr/local/lib/python3.7/site-packages (from asciimatics>=1.11.0->present) (0.1.8)
Installing collected packages: present
Successfully installed present-0.5.0
➜  present sample.md
zsh: /usr/local/bin/present: bad interpreter: /usr/local/opt/python/bin/python3.7: no such file or directory
➜  ls /usr/local/opt/python/bin | grep python3
python3
python3-config
python3.8
python3.8-config

Some kind of crash. just installed, but I can't get it to run.

$ present
'Traceback (most recent call last):
  File "/usr/local/bin/present", line 6, in <module>
    from present.cli import cli
  File "/usr/local/lib/python2.7/dist-packages/present/cli.py", line 6, in <module>
    from .slideshow import Slideshow
  File "/usr/local/lib/python2.7/dist-packages/present/slideshow.py", line 105
    _effect = eval(f"_{slide.effect}")(self.screen)
                                    ^
SyntaxError: invalid syntax

i also tried with a test.md file

Environment

• OS: [debian ]
• Terminal emulator: [ guake]
• Python version: [. 3.7.3]

Additional context installed with sudo pip install present

Describe the bug Using markdown comment throws NotImplementedError. I suspect this is due to the present using these comments as part of it's syntax (for effects and coloring).

To Reproduce Add a markdown comment (<!-- comment text here -->) to slides file.

Expected behavior Either not throwing an NotImplementedError exception or throwing a more descriptive one (e.g. informing that comments not being supported).

Slides

# Markdown Comments Test

Text before comment.

<!-- A markdown comment. -->

Text after comment.

Environment

• OS: Ubuntu 20.04.1 LTS
• Terminal emulator: kitty
• Python version: 3.8.2
• present version: 0.5.1

Additional context A solution for this could be differentiating between a regular comment and present syntax. For example <!-- effect=explosions --> could be a regular comment and <!-- [present] effect=explosions --> could be present syntax.

I teach coding at a middle school. I made this welcome slide for students to see as they join our zoom class.

Slide markdown and text of .yml file below.

<!-- fg=green bg=black -->
# Welcome to Coding
![codio](start_class.yml)

speed: 6
lines:
- prompt: Mr.H $
  in: pwd
  color: green
- out: '    home'
  color: green
  bold: True
- prompt: Mr.H $
  in: cd DATA/coding/
  color: green
- out: '    cwd = DATA/coding/'
  color: green
  bold: True
- prompt: Mr.H $
  in: run --start_class
  color: green
- out: '    Please Login to Canvas'
  color: green
  bold: True
- out: '    Students are logging in'
  color: green
  bold: True
- progress: true
  progressChar: █

>present sample.md
Traceback (most recent call last):
  File "c:\python38\lib\runpy.py", line 194, in _run_module_as_main      
    return _run_code(code, main_globals, None,
  File "c:\python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Python38\Scripts\present.exe\__main__.py", line 4, in <module>
  File "c:\python38\lib\site-packages\present\cli.py", line 6, in <module>
    from .slideshow import Slideshow
  File "c:\python38\lib\site-packages\present\slideshow.py", line 8, in <module>
    from asciimatics.screen import Screen, _CursesScreen
ImportError: cannot import name '_CursesScreen' from 'asciimatics.screen' (c:\python38\lib\site-packages\asciimatics\screen.py)

_CursesScreen is only UNIX-compatible. asciimatics also provides the use of _WindowsScreen class can be used instead for Windows-based systems.

Python's native curses doesn't directly support Windows. We can use this port instead https://pypi.org/project/windows-curses/ for Windows-based systems.

This allows present to run on Windows!

first issue - ModuleNotFoundError: No module named 'dataclasses'

$ pip3 install present 
$ present sample.md 
Traceback (most recent call last):
  File "/home/user/.local/bin/present", line 7, in <module>
    from present.cli import cli
  File "/home/user/.local/lib/python3.6/site-packages/present/cli.py", line 7, in <module>
    from .markdown import Markdown
  File "/home/user/.local/lib/python3.6/site-packages/present/markdown.py", line 6, in <module>
    from dataclasses import dataclass
ModuleNotFoundError: No module named 'dataclasses'

resolved, obviously with: pip3 install dataclasses, however shouldn't this be listed in the README as a dependency or automatically installed with requirements.txt or some such?

second issue - ValueError: (Slide 4) BlockQuote is not supported

$ present sample.md 
Traceback (most recent call last):
  File "/home/user/.local/lib/python3.6/site-packages/present/markdown.py", line 251, in parse
    Element = eval(element_name)
  File "<string>", line 1, in <module>
NameError: name 'BlockQuote' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/.local/bin/present", line 11, in <module>
    sys.exit(cli())
  File "/home/user/.local/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/home/user/.local/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/home/user/.local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/user/.local/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/user/.local/lib/python3.6/site-packages/present/cli.py", line 18, in cli
    slides = markdown.parse(f.read())
  File "/home/user/.local/lib/python3.6/site-packages/present/markdown.py", line 254, in parse
    f"(Slide {sliden + 1}) {element_name} is not supported"
ValueError: (Slide 4) BlockQuote is not supported

Implements #98 and allows presentation to be started from any slide

For example,

present --start 3 examples/sample.md

starts the presentation from the 4th slide onwards

CLI option naming and whether to use 0-based or 1-based indexing is up to the maintainers.

I think it would be very useful to add basic support for latex math symbols (e.g., greek letters).

jb-leger/flatlatex is a python converter from LaTeX math to human readable text math using unicode characters, which may be usable for this purpose.

Describe the bug After installation, I receive the following error when attempting to perform present sample.md.

Traceback (most recent call last):
  File "/opt/homebrew/bin/present", line 8, in <module>
    sys.exit(cli())
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/homebrew/lib/python3.9/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/present/cli.py", line 18, in cli
    show.play()
  File "/opt/homebrew/lib/python3.9/site-packages/present/slideshow.py", line 145, in play
    self.slides = [
  File "/opt/homebrew/lib/python3.9/site-packages/present/slideshow.py", line 146, in <listcomp>
    Slide(self, self.get_effects(slide), slide.fg_color, slide.bg_color)
  File "/opt/homebrew/lib/python3.9/site-packages/present/slideshow.py", line 124, in get_effects
    effects.extend(_base(self.screen, e, row, fg_color, bg_color))
  File "/opt/homebrew/lib/python3.9/site-packages/present/effects.py", line 130, in _base
    Text(element.render()),
  File "/opt/homebrew/lib/python3.9/site-packages/present/slide.py", line 367, in render
    Element = eval(element_name)
  File "<string>", line 1, in <module>
NameError: name 'InlineHtml' is not defined

I am unable to use the present command on any markdown file, as I get the same error every time.

Steps to reproduce the bug Steps used to install present:

1. pip install present seemed to work with no issues

Steps to reproduce the behavior:

1. On a MacOS, simply use pip install present, then git clone <repo> and cd /examples, then run present sample.md.
2. It does not work, and results in the error listed above

Expected behavior Well, hopefully the default slideshow should run. I'm thinking there is some dependency that is not installed? But I cannot figure out what it is--I am new to python, I apologize.

Slides I am using the included sample.md file.

Environment

• OS: MacOS
• Terminal: iTerm2
• Python version: 3.9.9
• present version: the latest (installed today). I cannot find specific version number as present --version is not an option. Sorry!

Description

This PR adds support for syntax highlighting on code blocks using pygments.

Related issues

• #101
• #109

Screenshots

Based on this markdown:

## Code blocks

```python
print("This is a test")
```

Foo

```js
const myFunc = (name, num) => {
  return [name, num + 4]
}

console.log(`Data is ${myFunc('John')[0]}`);
```

---

Here is a screenshot of the current output:

With asciimatics version 1.13.1.dev38+g1fde70e, the bug relating to parenthesis rendering is fixed:

Next steps

Here are the next steps just for this PR. I'm not planning on adding support for changing the styling theme - that can come later. I'm planning on refactoring and cleaning up, but feel free to offer any other suggestions.

• [x] Ensure whitespace has background to match rest of block
• [x] Stop code from being visually truncated
• [x] Pad the block with a border of dark background squares
• [x] Make sure multiple blocks can be rendered on same slide
• [ ] Update docs/_static/demo.gif to show the new highlighting feature
• [ ] Update asciimatics version to get bugfix when possible

Describe the bug

It could be good to add tables support.

Steps to reproduce the bug

Any presentation with the table:

# A table

| aaaaa | e |  |
|:-:|-:|-|
| ee | bbbbb |  |
| ff | d | cccc |

Expected behavior

A table

| aaaaa | e | | |:-:|-:|-| | ee | bbbbb | | | ff | d | cccc |

Describe the bug If you set a codios slide to speed 10, when you go to the next slide, the codios output remains visible.

Steps to reproduce the bug Steps used to install present:

1. pip install present

Steps to reproduce the behavior:

1. modify a codios example and set speed to 10. E.g.,

❯ git diff 
diff --git a/docs/gallery/back-to-school/codios/async.yml b/docs/gallery/back-to-school/codios/async.yml
index 10721e0..de42078 100644
--- a/docs/gallery/back-to-school/codios/async.yml
+++ b/docs/gallery/back-to-school/codios/async.yml
@@ -1,4 +1,4 @@
-speed: 8
+speed: 10
 lines:
 - prompt: $
   in: project creation using

Expected behavior You would expect that moving to the next slide, the previous codio slide would no longer be visible.

Screenshots end of codios slide:

following slide (artifacts of codios slide still present)

How it should look:

Environment

• OS: [ubuntu 18.04]
• Terminal emulator: [Konsole]
• Python version: [3.7.9]
• present version: [e.g. 0.6.0]