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diff --git a/2019/transcripts/28.md b/2019/transcripts/28.md deleted file mode 100644 index 8befe3b8..00000000 --- a/2019/transcripts/28.md +++ /dev/null @@ -1,104 +0,0 @@ -[[!meta title="Play and control your music with Emacs - Damien Cassou"]] - -- Hi everyone. In this lightening talk, I would like to present - MPDel, which is a user interface for MPD, the Music Player Daemon, - that's implemented in Emacs Lisp and runs entirely within Emacs. So - it relies on Music Player Daemon, which is quite old because it's a - sixteen years old project serving music with many different clients. - So if I look at clients of MPD you see there are all different kinds - so this ?android? projects or web projects or GTK projects and a - curses project, web projects, so yeah many different kinds of - clients. MPDel is implemented in Emacs Lisp, it's divided into - three parts. So there is a library libmpdel, which is it's own - project. That's doesn't propose any user interface, but instead it - proposes a set of primitive functions to build user interfaces on - top. Then you have the screenshot here on top of the MPDel, so it's - mostly tabulated lists based, and then you have another UI which is - based on ?IV?, and I will present ?the? two user interfaces in this - context of this project. So let's start the video by navigating the - music database. So it's a simple job to get the list of all your - artists. You can navigate with ?turned-out? shortcuts. And you - have isearch obviously ?for? imenu, and so I can go to ?pink? sites - with quick shortcuts. When you select your artists you can go to - which album by pressing return, and to go from an album to a - particular artist's songs, you also press return. - -- So that is going ?deep? from the album to the artist and from the - artist to the songs, and with carrots or shift-6 on my keyboard you - go up to the parent from the song to the albums, and from the albums - to the artists. So the next thing we can see is the playlists, so - on the left you have the database, and on the right I will put the - playlist. So for now there is nothing to listen to, and I will add - things in these lists, so we can add either artists, albums or - individual songs, so let's add one of my favorite songs, ?So equals? - from Pink Floyd. So you can add it to the playlist, or add it - immediately stop playing it, so this time I want to immediately play - it, so I press P for play. - -- And then I will press the carrot to go back to the artists and add - some more music, I will add an album by Dire Straits. So if I press - P now it will add all the album and also start with the first song, - but because I don't want to interrupt ?ecos? I will just press a to - add all the songs from this album. What we want to do now is - manipulate the playlists, so for now ?ecos? has started playing and - I can modify the playlist to decide what will be next, so by default - it's Sultans of Swing, but I can change that for prioritization for - example. - -- Like that, so I can move one song, I can also mark multiple songs - and move them around. - -- It's also possible to play the next song and the previous song so - you have M-n to play the next. And M-p to play the previous one. If - you wanted to delete a few songs from your album you can select them - and then press k for deletion, and then they are removed from the - database, not from the database, but only from the playlists. With - t you can toggle the mark, so if I want to select everything by - ?except ...? I can just press t. And t again to ??, if I want to - select everything I can always press t when nothing is marked, so I - can erase everything at once. - -- Something I can do now is display some information about the - currently played song, so I can press v wherever I am to get the - list of songs. It's very important to notice that whatever view you - are in the shortcuts are always the same, so if I go back to the - navigator with n, I can press ?? information about the current song, - so v here, which ?? about the current song. So you see that there - is the time, and the album and artist and ?? status, so if I pause - the music, it ?? pause. And backplaying. I can move forward and - move backward with M-s and M-v, I can do that slowly or fast with - different shortcuts, and from the current song you can press carrots - to go to the parents, so it's exactly the same shortcut as how we - were navigating from the songs to the albums and from the albums to - the artists, so it's carrots, and you go from the song to its album - and then from the album to the artist. - -- I tried when designing the shortcuts to make the keybindings do - always the same thing wherever you are, so if I press M-f now I will - fast-forward the current song, so the same shortcuts work the same - everywhere. And if I press ?....? Another way to control the - current playlists or stop playlists is to use the Ivy based - interface so it doesn't pop up any buffer, but you can still - navigate your database and select the songs to play. So if I start - the interface I get the list of all my artists in the minibuffer, so - I can choose for example MCC artists and the ?? ?king? and the song - I will pick this one for example, and there are many things I can do - from here, so I can add to the current playlist I can start playing - immediately, I can start and stop playlists, so let's see I just p - for playing it immediately. - -- So MPDel is mostly based on tabulated lists, which I really liked. - And after I implemented MPDel, I liked that kind of view so much I - decided to use the views for other kinds of packages, so I - implemented a database navigator, and also a network manager client - using tabulated lists, and I realized that all of those libraries - and tools they were sharing the same kind of code. So I decided to - abstract away from all of those and I created navigel which makes it - very easy to implement tabulated lists if you have a model of your - domain data that you want to navigate. - -- There is a lightening talk at EmacsConf about navigel so I encourage - you to have a look at it if you're interested in how I reimplemented - MPDel so that it's much simpler, and how I implemented all the other - packages. This is the end of my talk, I hope you liked it. And - happy EmacsConf. |