mirror of https://github.com/kepler155c/opus
48 lines
883 B
Lua
48 lines
883 B
Lua
local Util = require('util')
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local History = { }
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function History.load(filename, limit)
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local entries = Util.readLines(filename) or { }
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local pos = #entries + 1
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return {
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entries = entries,
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add = function(line)
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local last = entries[pos] or entries[pos - 1]
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if not last or line ~= last then
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table.insert(entries, line)
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if limit then
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while #entries > limit do
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table.remove(entries, 1)
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end
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end
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Util.writeLines(filename, entries)
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pos = #entries + 1
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end
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end,
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setPosition = function(p)
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pos = p
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end,
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back = function()
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if pos > 1 then
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pos = pos - 1
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return entries[pos]
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end
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end,
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forward = function()
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if pos <= #entries then
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pos = pos + 1
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return entries[pos]
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end
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end,
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}
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end
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return History
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