119 lines
3.4 KiB
Lua
119 lines
3.4 KiB
Lua
-- SPDX-FileCopyrightText: 2017 Daniel Ratcliffe
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--
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-- SPDX-License-Identifier: LicenseRef-CCPL
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--- Find help files on the current computer.
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--
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-- @module help
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-- @since 1.2
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local expect = dofile("rom/modules/main/cc/expect.lua").expect
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local sPath = "/rom/help"
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--- Returns a colon-separated list of directories where help files are searched
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-- for. All directories are absolute.
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--
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-- @treturn string The current help search path, separated by colons.
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-- @see help.setPath
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function path()
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return sPath
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end
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--- Sets the colon-separated list of directories where help files are searched
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-- for to `newPath`
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--
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-- @tparam string newPath The new path to use.
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-- @usage help.setPath( "/disk/help/" )
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-- @usage help.setPath( help.path() .. ":/myfolder/help/" )
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-- @see help.path
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function setPath(_sPath)
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expect(1, _sPath, "string")
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sPath = _sPath
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end
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local extensions = { "", ".md", ".txt" }
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--- Returns the location of the help file for the given topic.
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--
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-- @tparam string topic The topic to find
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-- @treturn string|nil The path to the given topic's help file, or `nil` if it
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-- cannot be found.
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-- @usage help.lookup("disk")
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-- @changed 1.80pr1 Now supports finding .txt files.
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-- @changed 1.97.0 Now supports finding Markdown files.
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function lookup(topic)
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expect(1, topic, "string")
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-- Look on the path variable
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for path in string.gmatch(sPath, "[^:]+") do
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path = fs.combine(path, topic)
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for _, extension in ipairs(extensions) do
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local file = path .. extension
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if fs.exists(file) and not fs.isDir(file) then
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return file
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end
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end
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end
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-- Not found
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return nil
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end
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--- Returns a list of topics that can be looked up and/or displayed.
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--
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-- @treturn table A list of topics in alphabetical order.
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-- @usage help.topics()
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function topics()
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-- Add index
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local tItems = {
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["index"] = true,
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}
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-- Add topics from the path
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for sPath in string.gmatch(sPath, "[^:]+") do
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if fs.isDir(sPath) then
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local tList = fs.list(sPath)
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for _, sFile in pairs(tList) do
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if string.sub(sFile, 1, 1) ~= "." then
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if not fs.isDir(fs.combine(sPath, sFile)) then
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for i = 2, #extensions do
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local extension = extensions[i]
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if #sFile > #extension and sFile:sub(-#extension) == extension then
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sFile = sFile:sub(1, -#extension - 1)
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end
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end
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tItems[sFile] = true
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end
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end
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end
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end
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end
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-- Sort and return
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local tItemList = {}
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for sItem in pairs(tItems) do
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table.insert(tItemList, sItem)
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end
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table.sort(tItemList)
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return tItemList
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end
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--- Returns a list of topic endings that match the prefix. Can be used with
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-- `read` to allow input of a help topic.
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--
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-- @tparam string prefix The prefix to match
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-- @treturn table A list of matching topics.
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-- @since 1.74
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function completeTopic(sText)
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expect(1, sText, "string")
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local tTopics = topics()
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local tResults = {}
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for n = 1, #tTopics do
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local sTopic = tTopics[n]
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if #sTopic > #sText and string.sub(sTopic, 1, #sText) == sText then
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table.insert(tResults, string.sub(sTopic, #sText + 1))
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end
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end
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return tResults
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end
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