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Hannes Mehnert 2017-01-31 16:20:10 +00:00
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@ -8,7 +8,7 @@ abstract: implement it once to know you can do it. implement it a second time a
![screenshot](https://berlin.ccc.de/~hannes/jackline2.png) ![screenshot](https://berlin.ccc.de/~hannes/jackline2.png)
Back in 2014, when we implemented [TLS](https://nqsb.io) in OCaml, at some point Back in 2014, when we implemented [TLS](https://nqsb.io) in OCaml, at some point
I was bored with TLS. I usually need at least two projects at the same time to I was bored with TLS. I usually need at least two projects (but not more than 5) at the same time to
procrastinate the one I should do with the other one - it is always more fun to procrastinate the one I should do with the other one - it is always more fun to
do what you're not supposed to do. I started to implement another security do what you're not supposed to do. I started to implement another security
protocol ([Off-the-record](https://otr.cypherpunks.ca/), resulted in protocol ([Off-the-record](https://otr.cypherpunks.ca/), resulted in
@ -153,6 +153,9 @@ every file you write, and keep readers for all versions ever written around.
My favourite marshalling format (human readable, structured) are still My favourite marshalling format (human readable, structured) are still
S-expressions - luckily there is a S-expressions - luckily there is a
[sexplib](https://github.com/janestreet/sexplib) in OCaml for handling these. [sexplib](https://github.com/janestreet/sexplib) in OCaml for handling these.
Additionally, once the initial configuration file has been created (e.g. interactively with the application), the application
does no further writes to the config file. Users can make arbitrary modifications to the file,
and restart the application (and they can make changes while the application is running).
I also appreciate another property of software: don't ever transmit any data or I also appreciate another property of software: don't ever transmit any data or
open a network connection unless initiated by the user. Don't be obviously open a network connection unless initiated by the user. Don't be obviously
@ -251,7 +254,7 @@ how many characters are already written on the terminal.
I recommend to look into [notty](https://github.com/pqwy/notty) if you want to I recommend to look into [notty](https://github.com/pqwy/notty) if you want to
do terminal graphics in OCaml! do terminal graphics in OCaml!
### Application logic ### Application logic and state
Stepping back, an XMPP client reacts to two input sources: the user input Stepping back, an XMPP client reacts to two input sources: the user input
(including terminal resize), and network input (or failure). The output is a (including terminal resize), and network input (or failure). The output is a
@ -344,7 +347,7 @@ from the UI to the XMPP task to inject messages and errors.
5. The global variable 5. The global variable
[`xmpp_session`](https://github.com/hannesm/jackline/blob/ec8f8c01d6503bf52be263cd319ef21f2b62ff2e/cli/cli_state.ml#L200) [`xmpp_session`](https://github.com/hannesm/jackline/blob/ec8f8c01d6503bf52be263cd319ef21f2b62ff2e/cli/cli_state.ml#L200)
should be part of the earlier mentioned `cli_state`. should be part of the earlier mentioned `cli_state`, also contacts should be a map, not a Hashtbl (took me some time to learn).
6. Having jackline self-hosted as a MirageOS unikernel. I've implemented a a 6. Having jackline self-hosted as a MirageOS unikernel. I've implemented a a
[telnet](https://github.com/hannesm/telnet) server, there is a [notty [telnet](https://github.com/hannesm/telnet) server, there is a [notty