Add nextletter function
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@ -18,6 +18,22 @@ describe("splitfilename", function()
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end)
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end)
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describe("nextletter", function()
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local nextfile = require "nextfile"
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it("should return the next letter when the current letter is not 'z'", function()
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local letter = nextfile.nextletter("q")
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assert.are.equal("r", letter)
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end)
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it("should return 'za' when the current letter is 'z'", function()
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local letter = nextfile.nextletter("z")
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assert.are.equal("za", letter)
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end)
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end)
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describe("nextfile", function()
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local prevfile = require "prevfile"
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local nextfile = require "nextfile"
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@ -44,10 +60,20 @@ describe("nextfile", function()
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insulate("prevfile.prevfile returns a numeric filename", function()
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prevfile.prevfile = function() return "/testdir/701.txt" end
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--it("should return the result of incrementing the filename", function()
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it("should return the result of incrementing the filename", function()
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local file = nextfile.nextfile("/testdir")
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assert.are.equal("/testdir/702.txt", file)
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end)
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end)
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insulate("prevfile.prevfile returns a non-numeric filename", function()
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prevfile.prevfile = function() return "/testdir/421b.txt" end
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--it("should return the result of replacing the last character with the next letter of the alphabet", function()
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--local file = nextfile.nextfile("/testdir")
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--assert.are.equal("/testdir/702.txt", file)
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--assert.are.equal("/testdir/421c.txt", file)
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--end)
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end)
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end)
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@ -7,16 +7,26 @@ function nextfile.splitfilename(path)
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return dir, name, ext
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end
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function nextfile.nextletter(letter)
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if letter == "z" then return "za" end
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local ascii = letter:byte()
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local nextascii = ascii + 1
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return string.char(nextascii)
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end
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function nextfile.nextfile(directory)
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local previous = prevfile.prevfile(directory)
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if previous == nil then return nil end
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local dir, name, ext = nextfile.splitfilename(previous)
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print(dir)
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print(name)
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print(ext)
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return ""
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if tonumber(name) == nil then
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local lastletter = name:sub(#name)
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return dir .. name:gsub() .. ext
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end
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return dir .. name + 1 .. ext
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end
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return nextfile
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