haven/README.adoc

Project haven
=============

haven is an umbrella project for a range of mostly desktop applications.

This README is being converted into a wiki on the wiki branch, also publicly
available at https://p.janouch.name/haven/Haven.html[].  We should only document
here that which has been created, as the extent of the rationale and plans is
gigantic and seems to have a life of its own.

Goal
----
The greater goal is to create a fresh computing environment for daily work and
play--easily controllable, reasonably complex, both visually and internally
unified and last but not least responsive.  One should be able to use it
comfortably with a 60% keyboard and no pointing device.

haven serves as a testing ground, leaning on the side of compromises.  It aims
to use today's Linux desktop as a support, relying on X11/Wayland, existing
window managers and web browsers.

The focus is therefore on going breadth-first, not depth-first.  Applications
only need to be good enough to be able to replace their older siblings at all.
I.e. for me personally.

Scope
-----
Subproject names aim to have the minimum viable, reasonably identifiable name.
To group them together, a common prefix of "h" is used.  The second column is
what should be used as the name in .desktop files, just like the GNOME project
figured out it would make sense:

 - hbe  - bitmap editor
 - hbfe - bitmap font editor
 - he   - text editor
 - hfm  - file manager
 - hib  - IRC bouncer
 - hic  - IRC client
 - hid  - IRC daemon
 - hiv  - image viewer
 - hm   - mail client
 - hmpc - MPD client
 - hnc  - netcat-alike
 - ho   - all-powerful organizer
 - hsm  - system monitor
 - hss  - spreadsheets
 - htd  - translation dictionary
 - ht   - terminal emulator
 - htk  - GUI toolkit library

See Projects for more information about the individual projects.

Some taken names in Debian: hd (important), hte, hy.

Projects
--------
These are sorted in the order in which they should be created in order to gain
the best possible momentum.  The htk GUI toolkit is implied as a side product
permeating the entire list.

Some information is omitted from these descriptions and lies either in my head
or in my other notes.

hid -- IRC daemon
~~~~~~~~~~~~~~~~~
This project is unimportant by itself, its sole purpose is to gain experience
with Go on something that I have already done and understand well.  Nothing
beyond achieving feature parity is in the initial scope.

One possibility of complicating would be adding simple WebSocket listeners but
that's already been done for me https://github.com/kiwiirc/webircgateway and
it's even in Go, I just need to set up kiwiirc.

Later, when we have a pleasant IRC client, implement either the P10 or the TS6
server-linking protocol and make atheme work with a generic module.
Alternatively add support for plugins.  The goal is to allow creating integrated
bridges to various public forums.

hnc -- netcat-alike
~~~~~~~~~~~~~~~~~~~
The result of testing hid with telnet, OpenSSL s_client, OpenBSD nc, GNU nc and
Ncat is that neither of them can properly shutdown the connection.  We need
a good implementation with TLS support.

hpcu -- PRIMARY-CLIPBOARD unifier
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
An improved replacement for autocutsel in selection synchronization "mode":

 - using only one OS process;
 - not polling selections twice a second unnecessarily;
 - calling SetSelectionOwner on change even when it already owns the selection,
   so that XFIXES SelectionNotify events are delivered;
 - not using cut buffers for anything.

Only UTF8_STRING-convertible selections are synchronized.

hswg -- static website generator
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wraps libasciidoc to make it understand more syntax, namely two-line/underlined
titles, and can be run either as an AsciiDoc processor for my Gitea, or as
a trivial wiki-like site generator.

ht -- terminal emulator
~~~~~~~~~~~~~~~~~~~~~~~
Similar scope to st(1).  Clever display of internal padding for better looks.

hib and hic -- IRC bouncer and client
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
An IRC client is a good starting application for building a GUI toolkit, as the
UI can afford to be truly minimalistic and most of it is text.

To resolve an issue I have with my current IRC client, the client is going to be
split into two parts: a bouncer that manages all connections and state, and
a separate GUI that communicates with the backend over TLS/WebSocket.  Perhaps
only the per-buffer input line is going to be desynchronized.

https://godoc.org/github.com/gorilla/websocket

The higher-level client-server API could be made rather generic to allow for
smooth integration with non-IRC "backends" such as Slack or Mattermost.

he -- text editor
~~~~~~~~~~~~~~~~~
VIM controls, no scripting, no syntax highlight, single-file, made for
variable-width/proportional fonts.  Initially done primarily to produce a text
editing widget, which is going to be an interesting challenge, arguably better
solved by whole program composition.  Scintilla may provide some inspiration.

In the second stage, support for the Language Server Protocol will be added so
that the project can be edited using its own tools.  Some scripting, perhaps
a tiny subset of VimL, might be desirable.  Or other means of configuration.

Visual block mode or the color column may still be implemented.

The real model for the editor is Qt Creator with FakeVIM, though this is not to
be a clone of it, e.g. the various "Output" lists could be just special buffers,
which may be have names starting on "// ".

.Resources:
 - http://doc.cat-v.org/plan_9/4th_edition/papers/sam/

ho -- all-powerful organizer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Zettelkasten with fulltext search, arbitrary reciprocal links, arbitrary tags.
Flat storage.  Should be able to use translation dictionaries for search hints.

Indexing and search may be based on a common database, no need to get all fancy:

 - http://rachbelaid.com/postgres-full-text-search-is-good-enough/
 - https://www.sqlite.org/fts3.html#full_text_index_queries (FTS4 seems better)

htd -- translation dictionary
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This specific kind of application doesn't need a lot of user interface either,
just a tab bar, text entry and two columns of text with simple formatting.

For simplicity we will establish a custom dictionary format based on either
simple compress/gzip with separate files in StarDict style or, since we don't
really strive for random access and memory-efficiency (those 120M that sdtui
takes with my 10 dictionaries isn't particularly bad), pack everything with
archive/zip.

Instead of ICU we may use x/text/collate and that's about everything we need.
Since we have our own format, we may expect the index to be ordered by the
locale's rules, assuming they don't change between versions.

hmpc -- MPD client
~~~~~~~~~~~~~~~~~~
Here the focus will be on the GUI toolkit.  I don't expect this application to
get big, since its predecessor nncmpp isn't either.  The daemon takes care of
all complex stuff.  It would be nice to add lyrics and search later, though.

hiv -- image viewer
~~~~~~~~~~~~~~~~~~~
JPG, PNG, first frame of GIF.  Zoom.  Going through adjacent files in directory
using cursor keys.  Possibly a dialog with image metadata.

hfm -- file manager
~~~~~~~~~~~~~~~~~~~
All we need to achieve here is replace Midnight Commander, which besides the
most basic features includes a VFS for archives.  The editing widget in
read-only mode could be used for F3.  The shell is going to work very simply,
creating a PTY device and running things under TERM=dumb while decoding SGR,
or one could decide to run a new terminal emulator with a different shortcut.
ht could probably also be integrated.

Eventually the number of panels should be arbitrary with proper shortcuts for
working with them.  We might also integrate a special view for picture previews,
which might or might not deserve its own program.

hss -- spreadsheets
~~~~~~~~~~~~~~~~~~~
The first version doesn't need to be able to reference other cells, and can more
or less be a CSV editor.

We can take inspiration from Excel:

 - https://docs.microsoft.com/en-us/office/client-developer/excel/excel-recalculation
 - https://www.microsoft.com/en-us/research/uploads/prod/2018/03/build-systems.pdf

The rest
~~~~~~~~
Currently there are no significant, specific plans about the other applications.