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module.exports = abbrev
function abbrev (...args) {
let list = args.length === 1 || Array.isArray(args[0]) ? args[0] : args
for (let i = 0, l = list.length; i < l; i++) {
list[i] = typeof list[i] === 'string' ? list[i] : String(list[i])
}
// sort them lexicographically, so that they're next to their nearest kin
list = list.sort(lexSort)
// walk through each, seeing how much it has in common with the next and previous
const abbrevs = {}
let prev = ''
for (let ii = 0, ll = list.length; ii < ll; ii++) {
const current = list[ii]
const next = list[ii + 1] || ''
let nextMatches = true
let prevMatches = true
if (current === next) {
continue
}
let j = 0
const cl = current.length
for (; j < cl; j++) {
const curChar = current.charAt(j)
nextMatches = nextMatches && curChar === next.charAt(j)
prevMatches = prevMatches && curChar === prev.charAt(j)
if (!nextMatches && !prevMatches) {
j++
break
}
}
prev = current
if (j === cl) {
abbrevs[current] = current
continue
}
for (let a = current.slice(0, j); j <= cl; j++) {
abbrevs[a] = current
a += current.charAt(j)
}
}
return abbrevs
}
function lexSort (a, b) {
return a === b ? 0 : a > b ? 1 : -1
}