917 lines
18 KiB
Lua
917 lines
18 KiB
Lua
local posix = require("posix")
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-- Targets:
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--
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-- {
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-- fullname = full name of target
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-- dir = target's build directory
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-- outs = target's object files
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-- is = { set of rule types which made the target }
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-- }
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local emitter = {}
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local rules = {}
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local targets = {}
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local buildfiles = {}
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local globals
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local cwd = "."
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local vars = {}
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local parente = {}
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local loadingstack = {}
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-- Forward references
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local loadtarget
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local function print(...)
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local function print_no_nl(list)
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for _, s in ipairs(list) do
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if (type(s) == "table") then
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io.stderr:write("{")
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for k, v in pairs(s) do
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print_no_nl({k})
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io.stderr:write("=")
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print_no_nl({v})
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io.stderr:write(" ")
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end
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io.stderr:write("}")
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else
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io.stderr:write(tostring(s))
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end
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end
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end
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print_no_nl({...})
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io.stderr:write("\n")
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end
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local function assertString(s, i)
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if (type(s) ~= "string") then
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error(string.format("parameter %d must be a string", i))
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end
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end
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local function concat(...)
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local r = {}
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local function process(list)
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for _, t in ipairs(list) do
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if (type(t) == "table") and not t.is then
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process(t)
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else
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r[#r+1] = t
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end
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end
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end
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process({...})
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return r
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end
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-- Test table membership (crudely).
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local function contains(needle, haystack)
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for _, k in ipairs(haystack) do
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if (k == needle) then
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return true
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end
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end
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return false
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end
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local function inherit(high, low)
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local o = {}
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setmetatable(o, {
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__index = function(self, k)
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local x = high[k]
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if x then
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return x
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end
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return low[k]
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end
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})
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for k, v in pairs(high) do
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local _, _, kk = k:find("^%+(.*)$")
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if kk then
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o[kk] = concat(low[kk], v)
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end
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end
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return o
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end
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local function asstring(o)
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local t = type(o)
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if (t == "nil") then
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return ""
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elseif (t == "string") then
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return o
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elseif (t == "number") then
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return o
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elseif (t == "table") then
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if o.is then
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return asstring(o.outs)
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else
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local s = {}
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for _, v in pairs(o) do
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s[#s+1] = asstring(v)
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end
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return table.concat(s, " ")
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end
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else
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error(string.format("can't turn values of type '%s' into strings", t))
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end
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end
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local function concatpath(...)
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local p = table.concat({...}, "/")
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return (p:gsub("/+", "/"):gsub("^%./", ""):gsub("/%./", "/"))
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end
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-- Returns a list of the targets within the given collection; the keys of any
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-- keyed items are lost. Lists and wildcards are expanded.
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local function targetsof(...)
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local o = {}
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local function process(items)
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for _, item in pairs(items) do
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if (type(item) == "table") then
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if item.is then
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-- This is a target.
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o[#o+1] = item
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else
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-- This is a list.
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process(item)
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end
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elseif (type(item) == "string") then
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-- Filename!
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if item:find("^%+") then
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item = cwd..item
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elseif item:find("^%./") then
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item = concatpath(cwd, item)
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end
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o[#o+1] = loadtarget(item)
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else
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error(string.format("member of target list is not a string or a target"))
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end
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end
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end
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process({...})
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return o
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end
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local function filenamesof(...)
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local targets = targetsof(...)
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local f = {}
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for _, r in ipairs(targets) do
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if (type(r) == "table") and r.is then
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if r.outs then
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for _, o in ipairs(r.outs) do
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f[#f+1] = o
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end
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end
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elseif (type(r) == "string") then
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f[#f+1] = r
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else
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error(string.format("list of targets contains a %s which isn't a target",
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type(r)))
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end
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end
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return f
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end
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local function targetnamesof(...)
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local targets = targetsof(...)
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local f
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for _, r in pairs(targets) do
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if (type(r) == "table") and r.is then
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f[#f+1] = r.fullname
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elseif (type(r) == "string") then
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f[#f+1] = r
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else
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error(string.format("list of targets contains a %s which isn't a target",
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type(r)))
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end
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end
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return f
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end
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local function dotocollection(files, callback)
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if (#files == 1) and (type(files[1]) == "string") then
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return callback(files[1])
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end
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local o = {}
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local function process(files)
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for _, s in ipairs(files) do
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if (type(s) == "table") then
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if s.is then
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error("passed target to a filename manipulation function")
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else
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process(s)
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end
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else
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local b = callback(s)
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if (b ~= "") then
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o[#o+1] = b
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end
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end
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end
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end
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process(files)
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return o
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end
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local function abspath(...)
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return dotocollection({...},
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function(filename)
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assertString(filename, 1)
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if not filename:find("^[/$]") then
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filename = concatpath(posix.getcwd(), filename)
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end
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return filename
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end
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)
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end
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local function basename(...)
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return dotocollection({...},
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function(filename)
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assertString(filename, 1)
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local _, _, b = filename:find("^.*/([^/]*)$")
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if not b then
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return filename
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end
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return b
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end
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)
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end
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local function dirname(...)
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return dotocollection({...},
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function(filename)
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assertString(filename, 1)
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local _, _, b = filename:find("^(.*)/[^/]*$")
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if not b then
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return ""
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end
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return b
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end
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)
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end
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local function replace(files, pattern, repl)
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return dotocollection({files},
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function(filename)
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return filename:gsub(pattern, repl)
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end
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)
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end
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local function fpairs(...)
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return ipairs(filenamesof(...))
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end
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local function matching(collection, pattern)
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local o = {}
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dotocollection(collection,
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function(filename)
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if filename:find(pattern) then
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o[#o+1] = filename
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end
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end
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)
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return o
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end
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-- Selects all targets containing at least one output file that matches
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-- the pattern (or all, if the pattern is nil).
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local function selectof(targets, pattern)
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local targets = targetsof(targets)
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local o = {}
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for k, v in pairs(targets) do
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if v.is and v.outs then
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local matches = false
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for _, f in pairs(v.outs) do
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if f:find(pattern) then
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matches = true
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break
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end
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end
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if matches then
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o[#o+1] = v
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end
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end
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end
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return o
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end
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local function uniquify(...)
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local s = {}
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return dotocollection({...},
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function(filename)
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if not s[filename] then
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s[filename] = true
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return filename
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end
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end
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)
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end
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local function startswith(needle, haystack)
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return haystack:sub(1, #needle) == needle
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end
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local function emit(...)
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local n = select("#", ...)
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local args = {...}
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for i=1, n do
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local s = asstring(args[i])
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io.stdout:write(s)
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if not s:find("\n$") then
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io.stdout:write(" ")
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end
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end
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end
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local function templateexpand(list, vars)
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vars = inherit(vars, globals)
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local o = {}
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for _, s in ipairs(list) do
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o[#o+1] = s:gsub("%%%b{}",
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function(expr)
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expr = expr:sub(3, -2)
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local chunk, e = loadstring("return ("..expr..")", expr)
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if e then
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error(string.format("error evaluating expression: %s", e))
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end
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setfenv(chunk, vars)
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local value = chunk()
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if (value == nil) then
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error(string.format("template expression '%s' expands to nil (probably an undefined variable)", expr))
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end
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return asstring(value)
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end
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)
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end
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return o
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end
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local function loadbuildfile(filename)
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if contains(filename, loadingstack) then
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error(string.format("build file cycle; '%s' refers to itself indirectly; stack is: %s %s",
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filename, asstring(loadingstack), filename))
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end
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loadingstack[#loadingstack+1] = filename
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if not buildfiles[filename] then
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buildfiles[filename] = true
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local fp, data, chunk, e
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io.stderr:write("loading ", filename, "\n")
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fp, e = io.open(filename)
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if not e then
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data, e = fp:read("*a")
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fp:close()
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if not e then
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local thisglobals = {}
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thisglobals._G = thisglobals
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setmetatable(thisglobals, {__index = globals})
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chunk, e = loadstring(data, "@"..filename)
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if not e then
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setfenv(chunk, thisglobals)
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end
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end
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end
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if e then
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error(string.format("couldn't load '%s': %s", filename, e))
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end
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local oldcwd = cwd
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cwd = dirname(filename)
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chunk()
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cwd = oldcwd
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end
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loadingstack[#loadingstack] = nil
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end
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local function loadbuildfilefor(filepart, targetpart)
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local normalname = concatpath(filepart, "/build.lua")
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if posix.access(normalname, "r") then
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loadbuildfile(normalname)
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return
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end
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local extendedname = concatpath(filepart, "/build-"..targetpart..".lua")
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if posix.access(extendedname, "r") then
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loadbuildfile(extendedname)
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return
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end
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error(string.format("could not access either '%s' or '%s'", normalname, extendedname))
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end
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loadtarget = function(targetname)
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if targets[targetname] then
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return targets[targetname]
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end
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local target
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if not targetname:find("%+") then
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local files
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if targetname:find("[?*]") then
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files = posix.glob(targetname)
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if not files then
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files = {}
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end
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else
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files = {targetname}
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end
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target = {
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outs = files,
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is = {
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__implicitfile = true
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}
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}
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targets[targetname] = target
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else
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local _, _, filepart, targetpart = targetname:find("^([^+]*)%+([%w-_]+)$")
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if not filepart or not targetpart then
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error(string.format("malformed target name '%s'", targetname))
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end
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if (filepart == "") then
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filepart = cwd
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end
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loadbuildfilefor(filepart, targetpart)
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target = targets[targetname]
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if not target then
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error(string.format("build file '%s' contains no target '%s'",
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filename, targetpart))
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end
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end
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return target
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end
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local typeconverters = {
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targets = function(propname, i)
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if (type(i) == "string") then
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i = {i}
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elseif (type(i) ~= "table") then
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error(string.format("property '%s' must be a target list", propname))
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end
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local m = {}
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for k, v in pairs(i) do
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local ts = targetsof(v)
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if (type(k) == "number") then
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for _, t in ipairs(ts) do
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m[#m+1] = t
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end
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else
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if (#ts ~= 1) then
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error(string.format("named target '%s' can only be assigned from a single target", k))
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else
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m[k] = ts[1]
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end
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end
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end
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return m
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end,
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strings = function(propname, i)
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if (type(i) == "string") then
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i = {i}
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elseif (type(i) ~= "table") then
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error(string.format("property '%s' must be a string list", propname))
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end
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return concat(i)
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end,
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boolean = function(propname, i)
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if (type(i) ~= "boolean") then
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error(string.format("property '%s' must be a boolean", propname))
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end
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return i
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end,
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string = function(propname, i)
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if (type(i) ~= "string") then
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error(string.format("property '%s' must be a string", propname))
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end
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return i
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end,
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table = function(propname, i)
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if (type(i) ~= "table") then
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error(string.format("property '%s' must be a table", propname))
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end
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return i
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end,
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object = function(propname, i)
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return i
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end,
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}
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local function definerule(rulename, types, cb)
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if rulename and rules[rulename] then
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error(string.format("rule '%s' is already defined", rulename))
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end
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types.name = { type="string" }
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types.cwd = { type="string", optional=true }
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types.vars = { type="table", default={} }
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for propname, typespec in pairs(types) do
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if not typeconverters[typespec.type] then
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error(string.format("property '%s' has unrecognised type '%s'",
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propname, typespec.type))
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end
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end
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local rulecwd = cwd
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local rule = function(e)
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local definedprops = {}
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for propname, _ in pairs(e) do
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definedprops[propname] = true
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end
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local args = {}
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for propname, typespec in pairs(types) do
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if not e[propname] then
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if not typespec.optional and (typespec.default == nil) then
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error(string.format("missing mandatory property '%s'", propname))
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end
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args[propname] = typespec.default
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else
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args[propname] = typeconverters[typespec.type](propname, e[propname])
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definedprops[propname] = nil
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end
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end
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local propname, _ = next(definedprops)
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if propname then
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error(string.format("don't know what to do with property '%s'", propname))
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end
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if not args.cwd then
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args.cwd = cwd
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end
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args.fullname = args.cwd.."+"..args.name
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local oldparente = parente
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parente = args
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args.vars = inherit(args.vars, oldparente.vars)
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local result = cb(args) or {}
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parente = oldparente
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result.is = result.is or {}
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if rulename then
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result.is[rulename] = true
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end
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result.fullname = args.fullname
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|
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if targets[arg.fullname] and (targets[arg.fullname] ~= result) then
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error(string.format("target '%s' is already defined", args.fullname))
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end
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targets[result.fullname] = result
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return result
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end
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|
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if rulename then
|
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if rules[rulename] then
|
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error(string.format("rule '%s' is already defined", rulename))
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end
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rules[rulename] = rule
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end
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return rule
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end
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-----------------------------------------------------------------------------
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|
-- DEFAULT RULES --
|
|
-----------------------------------------------------------------------------
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|
|
local function install_make_emitter()
|
|
emit("hide = @\n")
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|
|
|
function emitter:var(name, value)
|
|
-- Don't let emit insert spaces.
|
|
emit(name.."="..value.."\n")
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|
end
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|
|
|
function emitter:rule(name, ins, outs)
|
|
if (#outs == 0) then
|
|
local n = name.."-IMAGINARY-OUT"
|
|
emit(".INTERMEDIATE:", n, "\n")
|
|
outs = {n}
|
|
end
|
|
|
|
local impl = name.."-IMPL"
|
|
emit(".INTERMEDIATE:", name, "\n")
|
|
emit(".INTERMEDIATE:", impl, "\n")
|
|
|
|
for i = 1, #outs do
|
|
emit(name..":", outs[i], "\n")
|
|
end
|
|
for i = 1, #outs do
|
|
emit(outs[i]..":", impl, ";\n")
|
|
end
|
|
|
|
for i = 1, #ins do
|
|
emit(impl..":", ins[i], "\n")
|
|
end
|
|
|
|
emit(impl..":", "\n")
|
|
local dirs = uniquify(dirname(outs))
|
|
if (#dirs > 0) then
|
|
emit("\t@mkdir -p", dirs, "\n")
|
|
end
|
|
end
|
|
|
|
function emitter:phony(name, ins, outs)
|
|
emit(".PHONY:", name, "\n")
|
|
self:rule(name, ins, outs)
|
|
end
|
|
|
|
function emitter:label(...)
|
|
local s = table.concat({...}, " ")
|
|
emit("\t@echo", s, "\n")
|
|
end
|
|
|
|
function emitter:exec(commands)
|
|
for _, s in ipairs(commands) do
|
|
emit("\t$(hide)", s, "\n")
|
|
end
|
|
end
|
|
|
|
function emitter:endrule()
|
|
emit("\n")
|
|
end
|
|
end
|
|
|
|
local function install_ninja_emitter()
|
|
emit("rule build\n")
|
|
emit(" command = $command\n")
|
|
emit("\n")
|
|
|
|
local function unmake(collection)
|
|
return dotocollection({collection},
|
|
function(s)
|
|
return s:gsub("%$%b()",
|
|
function(expr)
|
|
return "${"..expr:sub(3, -2).."}"
|
|
end
|
|
)
|
|
end
|
|
)
|
|
end
|
|
|
|
function emitter:var(name, value)
|
|
-- Don't let emit insert spaces.
|
|
emit(name.."="..unmake(value).."\n")
|
|
end
|
|
|
|
function emitter:rule(name, ins, outs)
|
|
if (#outs == 0) then
|
|
emit("build", name, ": phony", unmake(ins), "\n")
|
|
else
|
|
emit("build", name, ": phony", unmake(outs), "\n")
|
|
emit("build", unmake(outs), ": build", unmake(ins), "\n")
|
|
end
|
|
end
|
|
|
|
function emitter:label(...)
|
|
end
|
|
|
|
function emitter:exec(commands)
|
|
emit(" command =", table.concat(unmake(commands), " && "), "\n")
|
|
end
|
|
|
|
function emitter:endrule()
|
|
emit("\n")
|
|
end
|
|
end
|
|
|
|
definerule("simplerule",
|
|
{
|
|
ins = { type="targets" },
|
|
outs = { type="strings" },
|
|
deps = { type="targets", default={} },
|
|
label = { type="string", optional=true },
|
|
commands = { type="strings" },
|
|
vars = { type="table", default={} },
|
|
},
|
|
function (e)
|
|
emitter:rule(e.fullname, filenamesof(e.ins, e.deps), e.outs)
|
|
emitter:label(e.fullname, " ", e.label or "")
|
|
|
|
local vars = inherit(e.vars, {
|
|
ins = filenamesof(e.ins),
|
|
outs = filenamesof(e.outs)
|
|
})
|
|
|
|
emitter:exec(templateexpand(e.commands, vars))
|
|
emitter:endrule()
|
|
|
|
return {
|
|
outs = e.outs
|
|
}
|
|
end
|
|
)
|
|
|
|
definerule("installable",
|
|
{
|
|
map = { type="targets", default={} },
|
|
},
|
|
function (e)
|
|
local deps = {}
|
|
local commands = {}
|
|
local srcs = {}
|
|
local outs = {}
|
|
local dests = {}
|
|
for dest, src in pairs(e.map) do
|
|
if src.is.installable then
|
|
if (type(dest) ~= "number") then
|
|
error("can't specify a destination filename when installing an installable")
|
|
end
|
|
deps[#deps+1] = src.fullname
|
|
outs = concat(outs, filenamesof(src))
|
|
elseif (type(dest) == "number") then
|
|
error("only references to other installables can be missing a destination")
|
|
else
|
|
local f = filenamesof(src)
|
|
if (#f ~= 1) then
|
|
error("installable can only cope with targets emitting single files")
|
|
end
|
|
|
|
deps[#deps+1] = f
|
|
dests[#dests+1] = dest
|
|
outs[#outs+1] = dest
|
|
commands[#commands+1] = "cp "..f[1].." "..dest
|
|
end
|
|
end
|
|
|
|
emitter:rule(e.fullname, deps, dests)
|
|
emitter:label(e.fullname, " ", e.label or "")
|
|
if (#commands > 0) then
|
|
emitter:exec(commands)
|
|
end
|
|
emitter:endrule()
|
|
|
|
return {
|
|
outs = outs
|
|
}
|
|
end
|
|
)
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- MAIN PROGRAM --
|
|
-----------------------------------------------------------------------------
|
|
|
|
local function parse_arguments(argmap, arg)
|
|
local i = 1
|
|
local files = {}
|
|
|
|
local function unrecognisedarg(arg)
|
|
argmap[" unrecognised"](arg)
|
|
end
|
|
|
|
while (i <= #arg) do
|
|
local o = arg[i]
|
|
local op
|
|
|
|
if (o:byte(1) == 45) then
|
|
-- This is an option.
|
|
if (o:byte(2) == 45) then
|
|
-- ...with a -- prefix.
|
|
o = o:sub(3)
|
|
local fn = argmap[o]
|
|
if not fn then
|
|
unrecognisedarg("--"..o)
|
|
end
|
|
i = i + fn(arg[i+1], arg[i+2])
|
|
else
|
|
-- ...without a -- prefix.
|
|
local od = o:sub(2, 2)
|
|
local fn = argmap[od]
|
|
if not fn then
|
|
unrecognisedarg("-"..od)
|
|
end
|
|
op = o:sub(3)
|
|
if (op == "") then
|
|
i = i + fn(arg[i+1], arg[i+2])
|
|
else
|
|
fn(op)
|
|
end
|
|
end
|
|
else
|
|
files[#files+1] = o
|
|
end
|
|
i = i + 1
|
|
end
|
|
|
|
argmap[" files"](files)
|
|
end
|
|
|
|
globals = {
|
|
posix = posix,
|
|
|
|
abspath = abspath,
|
|
asstring = asstring,
|
|
basename = basename,
|
|
concat = concat,
|
|
concatpath = concatpath,
|
|
cwd = function() return cwd end,
|
|
definerule = definerule,
|
|
dirname = dirname,
|
|
emit = emit,
|
|
filenamesof = filenamesof,
|
|
fpairs = fpairs,
|
|
include = loadbuildfile,
|
|
inherit = inherit,
|
|
print = print,
|
|
replace = replace,
|
|
matching = matching,
|
|
selectof = selectof,
|
|
startswith = startswith,
|
|
uniquify = uniquify,
|
|
vars = vars,
|
|
}
|
|
setmetatable(globals,
|
|
{
|
|
__index = function(self, k)
|
|
local rule = rules[k]
|
|
if rule then
|
|
return rule
|
|
else
|
|
return _G[k]
|
|
end
|
|
end
|
|
}
|
|
)
|
|
|
|
vars.cflags = {}
|
|
parente.vars = vars
|
|
|
|
setmetatable(_G,
|
|
{
|
|
__index = function(self, k)
|
|
local value = rawget(_G, k)
|
|
if not value then
|
|
error(string.format("access of undefined variable '%s'", k))
|
|
end
|
|
return value
|
|
end
|
|
}
|
|
)
|
|
|
|
do
|
|
local emitter_type = install_make_emitter
|
|
parse_arguments(
|
|
{
|
|
["make"] = function()
|
|
emitter_type = install_make_emitter
|
|
return 0
|
|
end,
|
|
|
|
["ninja"] = function()
|
|
emitter_type = install_ninja_emitter
|
|
return 0
|
|
end,
|
|
|
|
|
|
[" unrecognised"] = function(arg)
|
|
error(string.format("unrecognised argument '%s'", arg))
|
|
end,
|
|
|
|
[" files"] = function(files)
|
|
emitter_type()
|
|
|
|
for _, f in ipairs(files) do
|
|
local _, _, name, value = f:find("^([%w_]+)=(.*)$")
|
|
if name then
|
|
emitter:var(name, value)
|
|
end
|
|
end
|
|
|
|
for _, f in ipairs(files) do
|
|
if not f:find("=") then
|
|
loadbuildfile(f)
|
|
end
|
|
end
|
|
end
|
|
},
|
|
{...}
|
|
)
|
|
end
|
|
|