local core = require "core"
local command = require "core.command"
local Doc = require "core.doc"

local function eof_newline(doc)
    local leof,neof = #doc.lines,#doc.lines
    for i = leof,1,-1 do
        if not string.match(doc.lines[i],"^%s*$") then break end
        neof = i
    end
    local eol,_ = string.find(doc.lines[neof],"\n")
    if eol then
        doc:remove(neof,eol,math.huge,math.huge)
        return
    end
    doc:insert(neof,math.huge,"\n")
end

command.add("core.docview", {
    ["eof-newline:eof-newline"] = function()
        eof_newline(core.active_view.doc)
    end,
})

local save = Doc.save
    Doc.save = function(self, ...)
    eof_newline(self)
    save(self, ...)
end