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|
{ pkgs, getBins, writeExecline, runExeclineLocal, toNetstringKeyVal, ... }:
let
inherit (pkgs) lib;
bins = getBins pkgs.nodejs [ "node" ]
// getBins pkgs.coreutils [ "echo" "ln" "mkdir" ]
// getBins pkgs.dhall-json [ "json-to-dhall" ]
// getBins pkgs.xorg.xrandr [ "xrandr" ]
;
writeNodejs = {
name,
# an attrset of node dependency name to source directory;
# will be made into a node_modules directory and set as `NODE_PATH`.
dependencies
}:
let
node_modules = runExeclineLocal "${name}-node_modules" {
stdin = toNetstringKeyVal dependencies;
} [
"importas" "out" "out"
"if" [ bins.mkdir "$out" ]
"forstdin" "-o" "0" "-Ed" "" "dep"
"multidefine" "-d" "" "$dep" [ "name" "source" ]
"if" [ bins.echo "\${name} - \${source}" ]
bins.ln "-sT" "\${source}" "\${out}/\${name}"
];
in pkgs.writers.makeScriptWriter {
interpreter = writeExecline "nodejs-with-modules" {} [
"export" "NODE_PATH" node_modules
bins.node "$@"
];
} name;
dhall-typecheck = {
name,
dhallType,
recordsLoose ? false
}:
writeExecline name {} ([
bins.json-to-dhall
]
++ lib.optional recordsLoose "--records-loose"
++ [
dhallType
]);
parse = writeNodejs {
name = "xrandr-parse";
dependencies = {
xrandr-parse =
(pkgs.fetchFromGitHub {
owner = "lionep";
repo = "xrandr-parse";
rev = "a35bfd625c1b0834aa94f136cf8282b25624b3e6";
sha256 = "0c8mfsvgg76ia2i9gsgdwy567xzba5274xpj8si37yah5qpp8dkm";
});
};
} ''
var parse = require('xrandr-parse');
var exec = require('child_process').exec;
exec('xrandr', function (err, stdout) {
var query = parse(stdout);
console.log(JSON.stringify(query, null, 2));
});
'';
type = pkgs.writeText "type.dhall" ''
let Resolution = {
height: Text,
width: Text,
rate: Double
}
let Monitor =
< NotConnected : {}
| Connected : {
connected: Bool,
modes: List Resolution,
index: Natural,
native: Resolution
}
| Active : {
modes: List Resolution,
index: Natural,
native: Resolution,
current: Resolution
} >
in List {
mapKey: Text,
mapValue: Monitor
}
'';
two-monitor-setup = writeExecline "test" {} [
"backtick" "-Ei" "json" [ parse ]
"if" [
"pipeline" [ bins.echo "$json" ]
"redirfd" "-w" "1" "/dev/null"
(dhall-typecheck {
name = "typecheck-xrandr";
dhallType = type;
recordsLoose = true;
})
]
"pipeline" [ bins.echo "$json" ]
two-monitor-setup-script
];
two-monitor-setup-script = pkgs.writers.writePython3 "xrandr-two-monitor-setup" {} ''
import json
import sys
import os
# TODO: use netencode for input
monitors = json.load(sys.stdin)
connected = {
k: v for k, v in monitors.items()
if 'connected' in v and v['connected']
}
if 'eDP1' not in connected:
print("could not find eDP1 (laptop screen)", file=sys.stderr)
sys.exit(1)
if len(connected) != 2:
print("only know how to configure two monitors")
sys.exit(1)
eDP1 = connected['eDP1']
# laptop screen is active
assert 'current' in eDP1
# how far the laptop screen should be offset to end
# at the bottom of the monitor
h_offset = 0
for k, v in connected.items():
if k == 'eDP1':
assert 'current' in v
else:
h = int(v['native']['height'])
h_offset = h - int(eDP1['native']['height'])
external_monitor = (k, v)
# can’t handle bigger laptop screens atm
assert h_offset >= 0
xrandr_command = [
"--verbose",
"--output", external_monitor[0],
"--primary",
"--mode", "{}x{}".format(
external_monitor[1]['native']['width'],
external_monitor[1]['native']['height']
),
"--pos", "{}x{}".format(
# offset by the laptop size to the right
eDP1['native']['width'],
# monitor starts at 0
0
),
"--output", "eDP1",
"--mode", "{}x{}".format(
eDP1['native']['width'],
eDP1['native']['height'],
),
"--pos", "{}x{}".format(
# laptop is the leftmost screen
0,
# but offset to the bottom so that it always aligns on the left bottom
h_offset
),
]
os.execvp(
"${bins.xrandr}",
["${bins.xrandr}"]
+ xrandr_command
)
'';
in {
inherit
parse
two-monitor-setup
;
}
|
