Optional markdown support is missing in the 'multi_cell()' and 'write()' methods

[pwt]

Support for an optional markdown parameter was meant to have been added to the cell(), multi_cell() and write() methods (issue #108, PR #154), to allow rendering of inline bold, italic (etc.) text within a cell.

Support for the markdown parameter is present in the cell() method, but is missing from the multi_cell() and write() methods in FPDF2 v2.4.1.

Support is present in commit 508f39d, which is meant to be part of merged PR #154, but somehow this hasn't made it into the release.

[Lucas-C]

Thanks for opening this PR to keep track of this.

As mentioned in comment #108 (comment)
adding support for pseudo-Markdown styling in multi_cell() & write() will require some extra work.

Note that this feature is needed in order to properly fix issue #151

I have written some unit tests but I may not have the time to implement this soon.

Pull requests are very welcome!

[pwt]

Apologies, @Lucas-C -- I'd missed that comment.

(I will take a look to see if I could help with the implementation, but I suspect there'll be too much of an FPDF learning curve for me to contribute efficiently.)

[Lucas-C]

There are some unit tests to get started:

test_multi_cell_markdown.py.txt

[YeshiNamkhai]

Hi Lucas-C,
it would great to have it for multi_cell() considering also the template feature, say I may add 'markdown':True to the type TEXT and get the multiline formatted with bold, underline and italics.
Thanks

[Lucas-C]

Agreed @YeshiNamkhai !

I probably won't tackle this one myself in the near future.
Like most FLOSS projects, fpdf2 is based on volunteer work.
I you really would like this feature, please consider submitting a PR ! 😉

[YeshiNamkhai]

Well, I have no time to get it work in the last release, but adding few lines already does the job, I 've tested with your example and within my project. So far it's working well with Google fonts and custom templates.

@check_page
def multi_cell(
    self,
    w,
    h=None,
    txt="",
    border=0,
    align="J",
    fill=False,
    split_only=False,
    link="",
    ln=0,
    max_line_height=None,

    #add this:
    markdown=False,

):

then inside the function add markdown=True

        # Explicit line break
        if c == "\n":
            if self.ws > 0:
                self.ws = 0
                self._out("0 Tw")

            if max_line_height and h > max_line_height:
                height = max_line_height
                h -= height
            else:
                height = h
            new_page = self.cell(
                w,
                h=height,
                txt=substr(s, j, i - j),
                border=b,
                ln=2,
                align=align,
                fill=fill,
                link=link,

                #add this:
                markdown=markdown,

            )
            page_break_triggered = page_break_triggered or new_page
            text_cells.append(substr(s, j, i - j))

for every call of self.cell

[Lucas-C]

I am very surprised that it is actually as easy to implement 😲

When I worked on adding pseudo-Markdown support for FPDF.cell, I expected more complications with multi_cell due to the line breaks.

Anyway, I added your suggestion, thank you @YeshiNamkhai !
https://github.com/PyFPDF/fpdf2/blob/master/CHANGELOG.md#added