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utils.js
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utils.js
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"use strict";
const Compass = require("cardinal-direction");
const convert = require("convert-units");
const fs = require("fs");
const a = require("indefinite");
const moment = require("moment");
const {
abbreviations,
actionPhrases,
adsbx,
articles,
maximumAlt
} = require("./config");
const hashtags = require("./hashtags");
const operators = require("./storage/operators.json");
const types = require("./storage/types.json");
const addArticle = string => {
// See if string matches any exceptions defined in the config
for (const article of Object.keys(articles)) {
if (
articles[article].some(a =>
string.toLowerCase().includes(a.toLowerCase())
)
) {
return `${article} ${string}`;
}
}
return a(string, { capitalize: true });
};
const createStatus = (snap, state, ops, media) => {
const { alt_baro, flight, hex, dbFlags, r: reg, gs, track, t: frame } = state;
return fillTemplate(
"${action}${type}${id}${operator}${count} is currently flying${altitude} overhead${direction}${speed}${hashtag}${break}${media}${link}",
{
action: randomItem(actionPhrases),
type: formatType(frame),
id: formatIdentifier(flight, reg, dbFlags),
operator: formatOperator(flight, hex, reg, ops, dbFlags),
count: formatCount(snap),
altitude: formatAltitude(alt_baro),
direction: formatDirection(track),
speed: formatSpeed(gs),
hashtag: formatHashTag(state, snap),
break: (media || hex) && "\n",
media: media && `\n📸 ${media}`,
link:
hex &&
`\n📡 https://globe.adsbexchange.com/?icao=${hex}&lat=${
adsbx.lat
}&lon=${adsbx.lon}&zoom=12.0&showTrace=${moment().format("YYYY-MM-DD")}`
}
);
};
const deriveOpicao = (flight, reg, dbFlags) =>
!isMilitary(reg, dbFlags) && flight && flight.trim().slice(0, 3);
const fillTemplate = (templateString, templateVariables) =>
templateString.replace(/\${(.*?)}/g, (_, g) => templateVariables[g] || "");
const filterStates = (states = [], ignored) => {
return states.filter(({ alt_baro, flight, dbFlags, r: reg }) => {
const opicao = deriveOpicao(flight, reg, dbFlags);
if (maximumAlt && alt_baro > maximumAlt) return false;
if (alt_baro && alt_baro === "ground") return false;
if (
opicao &&
ignored &&
ignored.val().some(i => i.toLowerCase() === opicao.toLowerCase())
)
return false;
return true;
});
};
const formatAltitude = alt_baro =>
Boolean(alt_baro && alt_baro !== "ground") &&
` ${numberWithCommas(alt_baro)} ft`;
const formatCount = snap => {
const count = snap.val() && Object.keys(snap.val().timestamps).length;
return (
Boolean(count) &&
`, seen ${
count === 1 ? "once" : `${numberWithCommas(count)} times`
} before,`
);
};
const formatDirection = track =>
Boolean(track) &&
` and heading ${Compass.cardinalFromDegree(
track,
Compass.CardinalSubset.Ordinal
)}`;
const formatHashTag = (state, snap) => {
let string = "";
Object.keys(hashtags).forEach(hashtag => {
const value = hashtags[hashtag](state, snap);
if (value) {
string += ` #${value}`;
}
});
return string;
};
const formatIdentifier = (flight, reg, dbFlags) =>
(reg && !isMilitary(reg, dbFlags) && ` #${reg}`) ||
(flight && ` #${flight.trim()}`) ||
false;
const formatOperator = (flight, hex, reg, ops, dbFlags) => {
const opicao = deriveOpicao(flight, reg, dbFlags);
let value = "";
if (hex && ops.val().icao && ops.val().icao[hex.toUpperCase()]) {
value = ops.val().icao[hex.toUpperCase()];
} else if (opicao && ops.val().opicao && ops.val().opicao[opicao]) {
value = ops.val().opicao[opicao];
} else if (opicao && operators[opicao]) {
value = operators[opicao][0];
}
return Boolean(value) && ` operated by ${sanitizeString(value)}`;
};
const formatSpeed = gs =>
Boolean(gs && gs !== 0) &&
` at ${Math.round(
convert(Number(gs))
.from("knot")
.to("m/h")
)} mph`;
const formatType = frame => {
let value = "";
if (types[frame] && types[frame][0]) {
value = types[frame][0];
} else if (frame) {
value = frame;
}
return value ? ` ${addArticle(sanitizeString(value))}` : " An aircraft";
};
const isMilitary = (reg, dbFlags) =>
(reg && (reg.includes("-") || (!isNaN(reg) && !isNaN(parseFloat(reg))))) ||
(dbFlags && dbFlags === 1);
const isNewState = (snap, cooldown) => {
const timestamps = snap.val() && snap.val().timestamps;
return (
!snap.exists() ||
!timestamps ||
moment(
timestamps[Object.keys(timestamps)[Object.keys(timestamps).length - 1]]
).isBefore(moment().subtract(cooldown, "minutes"))
);
};
const numberWithCommas = n =>
n.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
const randomItem = array => array[Math.floor(Math.random() * array.length)];
const sanitizeString = string =>
string
.replace("''", "'")
.split(" ")
.map(w => {
// Check config for abbreviations that we want capitalized
if (abbreviations.some(a => w.toLowerCase() === a.toLowerCase())) {
return w.toUpperCase();
}
// Don't sentence case these words
if (["of", "the"].some(s => w.toLowerCase() === s.toLowerCase())) {
return w.toLowerCase();
}
// Don't sentence case words with numbers or symbols, otherwise go ahead
return !/\d|[#@.\-/]/.test(w)
? w[0].toUpperCase() + w.substr(1).toLowerCase()
: w;
})
.join(" ")
.trim();
module.exports = {
addArticle,
createStatus,
filterStates,
formatAltitude,
formatCount,
formatDirection,
formatHashTag,
formatIdentifier,
formatOperator,
formatSpeed,
formatType,
isMilitary,
isNewState,
numberWithCommas,
randomItem,
sanitizeString
};