From a5266a028f7a9414af3ebc38ec569d3f7503cf51 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg@phi-gamma.net>
Date: Wed, 27 Jun 2018 19:26:06 +0200
Subject: cal: define preliminary api

---
 cal.lua   | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++----------
 inout.lua | 10 ++++++++++
 2 files changed, 60 insertions(+), 10 deletions(-)
 create mode 100644 inout.lua

diff --git a/cal.lua b/cal.lua
index 1c6a453..bb48c68 100755
--- a/cal.lua
+++ b/cal.lua
@@ -7,6 +7,8 @@
 
 local io            = require "io"
 local ioopen        = io.open
+local iostdin       = io.stdin
+local iostdout      = io.stdout
 
 local math          = require "math"
 local mathmin       = math.min
@@ -301,21 +303,59 @@ local loaddata = function (fname)
     error ("could not open file " .. fname .. " for reading")
   end
 
-  return fh:read ("*a")
+  local ret = fh:read ("*a")
+  fh:close ()
+
+  return ret
 end
 
-local main = function (argv)
-  if #argv ~= 1 then
-    error "pass me a file name, I insist!"
-  end
+-------------------------------------------------------------------------------
+--- API
+-------------------------------------------------------------------------------
+
+local set_verbosity = function (n) verboselvl = n end
+
+local parse = function (raw)
+  local ok, obj = pcall (parse_calendar, raw)
+  return ok and obj
+end
+
+local parse_handle = function (fh)
+  local raw = fh:read ("*a")
+  return raw ~= nil and parse (raw)
+end
 
-  local raw = loaddata (argv [1])
-  local cal = parse_calendar (raw)
+local parse_file = function (fname)
+  local fh = ioopen (fname, "r")
+  local cal = parse_handle (fh)
+  fh:close ()
+  return cal
+end
+
+local parse_stdin = function ()
+  return parse_handle (iostdin)
+end
 
-  if cal ~= nil then println (fmt_calendar (cal, nil, "\n")) end
+local format = function (cal, newline)
+  return fmt_calendar (cal, nil, newline or "\n")
+end
+
+local output_handle = function (cal, fh)
+  local str = fmt_calendar (cal, nil, newline or "\n")
+  fh:write (str)
+end
 
-  return 0
+local output = function (cal)
+  return output_handle (cal, iostdout)
 end
 
-return main (arg)
+return { set_verbosity = set_verbosity
+       , parse         = parse
+       , parse_handle  = parse_handle
+       , parse_file    = parse_file
+       , parse_stdin   = parse_stdin
+       , format        = format
+       , output        = output
+       , output_handle = output_handle
+       }
 
diff --git a/inout.lua b/inout.lua
new file mode 100644
index 0000000..ad1c23d
--- /dev/null
+++ b/inout.lua
@@ -0,0 +1,10 @@
+local cal = require "cal"
+
+local main = function (argv)
+  local ok = cal.output (cal.parse_stdin ())
+
+  return ok and 0 or -1
+end
+
+os.exit (main ())
+
-- 
cgit v1.2.3