fill-paragraph on multiple paragraphs at once

Question

I often cut and paste non "filled" text into text files (mostly in org-mode).  I then have to go line by line and call fill-paragraph or org-fill-paragraph in org-mode to clean up the text.  I was wondering if there's a way to apply this operation to multiple paragraphs at once maybe in a region.  For example, if we have the following paragraphs in org-mode with fill-column set to 20:
- This is the first paragraph.
- This is the second paragraph.

I'd like to mark both with a region, and then have them transform into:
- This is the first
  paragraph.
- This is the second
  paragraph.

It seems that fill-region is suppose to do this.  I've tried calling it with various parameter combinations but it just condenses that entire region as one paragraph:
- This is the first
paragraph. - This
is the second
paragraph.

Drew · Answer

Dunno about Org mode, but in normal circumstances those two lines are not considered paragraphs, because they are separated only by a single newline character (C-j).
However, if you separate them by a blank line (i.e., another newline char), then M-x fill-region does what you expect:
- This is the first paragraph.

- This is the second paragraph.

becomes (assuming fill-column is 20):
- This is the first
  paragraph.

- This is the second
  paragraph.

See the Emacs manual, node Paragaphs, and the Elisp manual, node Standard Regexps.  See, in particular, option paragraph-separate.

fill-paragraph on multiple paragraphs at once

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