1 files changed, 41 insertions, 0 deletions
diff --git a/luaext/linit.lua b/luaext/linit.lua
new file mode 100644
index 000000000..7b134ba75
--- /dev/null
+++ b/luaext/linit.lua
@@ -0,0 +1,41 @@
+
+rex.new = rex.newPOSIX
+
+util = {}
+
+function util.grep(expr, filename)
+	if not posix.stat(filename, "mode") then
+		return nil
+	end
+	local lines = {}
+	local pat = rex.new(expr)
+	local pos = 1
+	for line in io.lines(filename) do
+		if pat:match(line) then
+			table.insert(lines, pos, line)
+		end
+		pos = pos + 1
+	end
+	if table.getn(lines) == 0 then
+		return nil
+	end
+	return lines
+end
+
+function util.igrep(expr, filename)
+	return ipairs(rex.grep(expr, filename))
+end
+
+function util.bgrep(expr, filename)
+	if not posix.stat(filename, "mode") then
+		return nil
+	end
+	local pat = rex.new(expr)
+	for line in io.lines(filename) do
+		if pat:match(line) then
+			return true
+		end
+	end
+	return false
+end
+