Output units in millimetres rather than centimetres

[adunning]

Pandoc 2 converts any use of millimetres to centimetres; it would be cleaner and more idiomatic to reverse this. In my experience, millimetres are more common (though not universal) when metric is used in book design, since they mostly eliminate the need for decimals; A4 paper, for example, is usually described as 297 × 210 mm. Avoidance of decimals is desirable particularly because the separator varies by language (Pandoc does not recognize '29,7 cm').

Example (version 2.0.0.1):

pandoc << EOT
![image]

[image]: http://example.com/image.jpg {height=35mm}
EOT

Result:

<figure>
<img src="http://example.com/image.jpg" alt="image" style="height:3.5cm" /><figcaption>image</figcaption>
</figure>

[jgm]

Sounds reasonable to me!

[jgm]

In Text.Pandoc.ImageSize, we have:

data Dimension = Pixel Integer
               | Centimeter Double
               | Inch Double
               | Percent Double
               | Em Double

No Millimeter. That's why mm is converted.

@mb21 - can you recall whether there was a reason why we don't have Millimeter?

[mb21]

If I recall correctly, the reason was simply that in my personal experience cm felt more common. But I'm not in the printing business... and I don't mind either way. Maybe ask around on pandoc-discuss?

[jgm]

I've pushed a commit that leaves 'mm' alone.
It doesn't convert 'cm' to 'mm' ; that seems a bit intrusive.

[adunning]

Thank you!