126 lines
3.2 KiB
Lua
126 lines
3.2 KiB
Lua
--
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-- Embed the Lua scripts into src/host/scripts.c as static data buffers.
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-- I embed the actual scripts, rather than Lua bytecodes, because the
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-- bytecodes are not portable to different architectures, which causes
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-- issues in Mac OS X Universal builds.
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--
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-- remember where I live, so I can find the files I need
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local basedir = path.getdirectory(os.getcwd())
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local function stripfile(fname)
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local f = io.open(fname)
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local s = assert(f:read("*a"))
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f:close()
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-- strip tabs
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s = s:gsub("[\t]", "")
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-- strip any CRs
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s = s:gsub("[\r]", "")
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-- strip out block comments
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s = s:gsub("[^\"']%-%-%[%[.-%]%]", "")
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s = s:gsub("[^\"']%-%-%[=%[.-%]=%]", "")
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s = s:gsub("[^\"']%-%-%[==%[.-%]==%]", "")
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-- strip out inline comments
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s = s:gsub("\n%-%-[^\n]*", "\n")
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-- escape backslashes
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s = s:gsub("\\", "\\\\")
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-- strip duplicate line feeds
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s = s:gsub("\n+", "\n")
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-- strip out leading comments
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s = s:gsub("^%-%-[^\n]*\n", "")
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-- escape line feeds
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s = s:gsub("\n", "\\n")
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-- escape double quote marks
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s = s:gsub("\"", "\\\"")
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return s
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end
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local function appendfile(result, fname, contents)
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table.insert(result, "\t/* " .. fname .. " */\n")
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-- break up large strings to fit in Visual Studio's string length limit
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local max = 4096
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local start = 1
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local len = contents:len()
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while start <= len do
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local n = len - start
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if n > max then n = max end
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local finish = start + n
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-- make sure I don't cut an escape sequence
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while contents:sub(finish, finish) == "\\" do
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finish = finish - 1
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end
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local s = contents:sub(start, finish)
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table.insert(result, "\t\"" .. s .. iif(finish < len, "\"\n", "\",\n"))
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start = finish + 1
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end
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table.insert(result, "\n")
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end
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function doembed()
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-- Find and run the manifest file. Checks the normal search paths to
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-- allow for manifest and _premake_main customizations, then falls
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-- back to the canonical version at ../src if not found.
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local dir = os.pathsearch("_manifest.lua", _OPTIONS["scripts"], os.getenv("PREMAKE_PATH"))
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if not dir then
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dir = path.join(basedir, "src")
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end
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scripts = dofile(path.join(dir, "_manifest.lua"))
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-- Main script always goes first
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table.insert(scripts, 1, "_premake_main.lua")
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-- Convert all scripts to single in-memory string
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local result = {}
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table.insert(result, "/* Premake's Lua scripts, as static data buffers for release mode builds */\n")
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table.insert(result, "/* DO NOT EDIT - this file is autogenerated - see BUILD.txt */\n")
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table.insert(result, "/* To regenerate this file, run: premake5 embed */ \n\n")
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table.insert(result, "const char* builtin_scripts[] = {\n")
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for i, fn in ipairs(scripts) do
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local s = stripfile(path.join(dir, fn))
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appendfile(result, fn, s)
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end
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table.insert(result, "\t0\n};\n");
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result = table.concat(result)
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-- Compare it to the current contents of scripts.c; only write out
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-- a new scripts.c if there have been changes
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local oldVersion
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local scriptsFile = path.join(basedir, "src/host/scripts.c")
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local file = io.open(scriptsFile, "r")
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if file then
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oldVersion = file:read("*a")
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file:close()
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end
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if oldVersion ~= result then
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print("Writing scripts.c")
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file = io.open(scriptsFile, "w+b")
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file:write(result)
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file:close()
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end
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end
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