I was interested in what happened to Jedit, an old free text processor I found in my Applications folder that hadn't been updated in years, and I discovered that aside from a new shareware version of the app (which froze on me when I tried closing an edited file and had to be Force-Quit), the developer also had a $17.99 writing app in the Mac App Store that does folding (as well as handling vertical writing), apparently oriented towards writing in ideographic text:

https://itunes.apple.com/us/app/hagoromo/id865949654?mt=12

"Hagoromo: A rich text editor for editing Western and Japanese documents. Supports the outline processing that allows text to be organized into discrete sections that are related in a tree structure or hierarchy. Text may be collapsed into a node, or expanded and edited. Supports powerful search and replace functions and the latest OS X features such as iCloud, Full Screen, Auto-Save, Versions and more. A new text engine has been developed in order to bring light and smooth vertical text editing, and supports many functions which are specific to Japanese, such as genko-mode, ruby, tate-chu-yoko, kenten and so on. These features are difficult to be realized with the standard text engine NSTextView."

The translation of the app on the dev's site give a little more information: "Hagoromo is a rich text editor mainly for editing Japanese.... Using the outline processing function makes it possible to describe the details of each detail after deciding the rough whole structure of the sentence, which is very useful when creating long sentences. The outline hierarchy of Hagoromo is compatible with the list of rtf documents. If you display the Hagoromo document in a text edit, the outline hierarchy part will be displayed as a list and the list created by text edit will be displayed as outline hierarchy in Hagoromo as it is.... Because it is original text engine conscious of Japanese, vertical writing can be done lightly as it is."

Unfortunately the screenshots are all in Japanese, so it's hard to see how or if it might work for English speakers, or even if the app has any non-Japanese menu localizations (as Jedit does). Still, intriguing.

Please review if you try it. It looks like cool software.

satis wrote:

I was interested in what happened to Jedit, an old free text processor I
found in my Applications folder that hadn't been updated in years, and I
discovered that aside from a new shareware version of the app (which
froze on me when I tried closing an edited file and had to be
Force-Quit), the developer also had a $17.99 writing app in the Mac App
Store that does folding (as well as handling vertical writing),
apparently oriented towards writing in ideographic text:

https://itunes.apple.com/us/app/hagoromo/id865949654?mt=12

"Hagoromo: A rich text editor for editing Western and Japanese
documents. Supports the outline processing that allows text to be
organized into discrete sections that are related in a tree structure or
hierarchy. Text may be collapsed into a node, or expanded and edited.
Supports powerful search and replace functions and the latest OS X
features such as iCloud, Full Screen, Auto-Save, Versions and more. A
new text engine has been developed in order to bring light and smooth
vertical text editing, and supports many functions which are specific to
Japanese, such as genko-mode, ruby, tate-chu-yoko, kenten and so on.
These features are difficult to be realized with the standard text
engine NSTextView."

The translation of the app on the dev's site give a little more
information: "Hagoromo is a rich text editor mainly for editing
Japanese.... Using the outline processing function makes it possible to
describe the details of each detail after deciding the rough whole
structure of the sentence, which is very useful when creating long
sentences. The outline hierarchy of Hagoromo is compatible with the list
of rtf documents. If you display the Hagoromo document in a text edit,
the outline hierarchy part will be displayed as a list and the list
created by text edit will be displayed as outline hierarchy in Hagoromo
as it is.... Because it is original text engine conscious of Japanese,
vertical writing can be done lightly as it is."

Unfortunately the screenshots are all in Japanese, so it's hard to see
how or if it might work for English speakers, or even if the app has any
non-Japanese menu localizations (as Jedit does). Still, intriguing.

I went ahead and contacted the developer, asking if there was a demo version. The answer was no, unfortunately, but he confirmed that the menu is localised (i.e. either English or Japanese) but there is currently no english manual available.
Diff works, as does outlining, but many of the functions that make Hadoromo special are specific to Japanese and will thus be lost on us Westerners.
He suggested to use the new version of Jedit Ω however, I do not know if that supports outlining and folding etc

Hope this helps
Prion


satis wrote:

Unfortunately the screenshots are all in Japanese, so it's hard to see
how or if it might work for English speakers, or even if the app has any
non-Japanese menu localizations (as Jedit does). Still, intriguing.

Thanks for the good info @Prion.

Back in the day the old Jedit was a pretty nice competitor to TextWrangler, but I think it was a 32-bit app, and it was deprecated by the developer. The new Jedit Ω, which work for free but sells (unlocks?) for around $11, offers a lot of nice text features for the money - version control, automatic backup, RTF, tabbed window, bookmarks, Applescript-friendly, advanced Find - but unfortunately not folding.

http://www.artman21.com/en/jeditOmega/