db: add json writer functionality

This introduces a dependency on the cjson library.

2 files changed, 63 insertions, 0 deletions

diff --git a/db.lua b/db.lua
new file mode 100644
index 0000000..4e7434a
--- /dev/null
+++ b/db.lua
@@ -0,0 +1,43 @@
+--[[--
+
+  JSON file database.
+
+--]]--
+
+local inspect = require "ext.inspect"
+
+local cjson               = require "cjson"
+
+local pcall               = pcall
+
+local io                  = require "io"
+local iostdout            = io.stdout
+
+local common              = require "common"
+local common_status       = common.status
+local status_ok           = common_status.codes.ok
+local status_error        = common_status.codes.error
+local println             = common.println
+local errorln             = common.errorln
+local noiseln             = common.noiseln
+local debugln             = common.debugln
+
+-------------------------------------------------------------------------------
+--- API
+-------------------------------------------------------------------------------
+
+local output_calendar = function (cal, fh)
+  fh = fh or iostdout
+  local jsenc = cjson.new ()
+  local ok, str = pcall (jsenc.encode, cal)
+  if ok == false then
+          errorln ("todb: failed to serialize calendar: %s", str)
+    return status_error
+  end
+  fh:write (str)
+  return status_ok
+end
+
+return { output_calendar = output_calendar
+       }
+
diff --git a/todb.lua b/todb.lua
new file mode 100755
index 0000000..50799ec
--- /dev/null
+++ b/todb.lua
@@ -0,0 +1,20 @@
+#!/usr/bin/env lua
+local cal     = require "cal"
+local db      = require "db"
+local common  = require "common"
+
+common.set_verbosity (1)
+
+local main = function (argv)
+  local ok, parsed = cal.parse_stdin ()
+  if not ok then
+    return -1
+  end
+
+  local ok = db.output_calendar (parsed)
+
+  return ok and 0 or -1
+end
+
+os.exit (main ())
+