Lua helper functions

lua-functions.lua

local function ellipsize(text, length)
    return (text:len() > length and length > 0)
        and text:sub(0, length - 3) .. '...'
        or text
end

--- Converts seconds to "time ago" represenation, like '1 hour ago'
local function to_time_ago(seconds)
    local days = seconds / 86400
    if days > 1 then
        days = math.floor(days + 0.5)
        return days .. (days == 1 and ' day' or ' days') .. ' ago'
    end

    local hours = (seconds % 86400) / 3600
    if hours > 1 then
        hours = math.floor(hours + 0.5)
        return hours .. (hours == 1 and ' hour' or ' hours') .. ' ago'
    end

    local minutes = ((seconds % 86400) % 3600) / 60
    if minutes > 1 then
        minutes = math.floor(minutes + 0.5)
        return minutes .. (minutes == 1 and ' minute' or ' minutes') .. ' ago'
    end
end

--- Convert degrees Celsius to Fahrenheit
local function celsius_to_fahrenheit(c) return c * 9 / 5 + 32 end

-- Convert degrees Fahrenheit to Celsius
local function fahrenheit_to_celsius(f) return (f - 32) * 5 / 9 end


local function hex2rgb(hex)
    if hex == '#ebedf0' then hex = empty_color end
    hex = tostring(hex):gsub("#","")
    return tonumber("0x" .. hex:sub(1, 2)),
            tonumber("0x" .. hex:sub(3, 4)),
            tonumber("0x" .. hex:sub(5, 6))
end