#!/usr/bin/env ruby

commands = %w{push generate}

command = ARGV[0]

if !commands.include?(command)
  puts <<-USAGE
Couchview has two modes: push and generate. Run couchview push or couchview generate for usage documentation.  
USAGE
  exit
end

if ARGV.length == 1
  case command
  when "generate"
    puts <<-GEN

    
GEN
  when "push"
    puts <<-PUSH
== Pushing views with Couchview ==

Usage: couchview push directory dbname

Couchview expects a specific filesystem layout for your CouchDB views (see
example below). It also supports advanced features like inlining of library
code (so you can keep DRY) as well as avoiding unnecessary document
modification.

Couchview also solves a problem with CouchDB's view API, which only provides
access to the final reduce side of any views which have both a map and a
reduce function defined. The intermediate map results are often useful for
development and production. CouchDB is smart enough to reuse map indexes for
functions duplicated across views within the same design document.

For views with a reduce function defined, Couchview creates both a reduce view
and a map-only view, so that you can browse and query the map side as well as
the reduction, with no performance penalty.

== Example ==

couchview push foo-project/bar-views baz-database

This will push the views defined in foo-project/bar-views into a database
called baz-database. Couchview expects the views to be defined in files with
names like:

foo-project/bar-views/my-design/viewname-map.js
foo-project/bar-views/my-design/viewname-reduce.js
foo-project/bar-views/my-design/noreduce-map.js

Pushed to => http://localhost:5984/baz-database/_design/my-design

And the design document:  
    {
      "views" : {
        "viewname-map" : {
          "map" : "### contents of view-name-map.js ###"
        },
        "viewname-reduce" : {
          "map" : "### contents of view-name-map.js ###",
          "reduce" : "### contents of view-name-reduce.js ###"
        },
        "noreduce-map" : {
          "map" : "### contents of noreduce-map.js ###"
        }
      }
    }

Couchview will create a design document for each subdirectory of the views
directory specified on the command line.

== Library Inlining == 

Couchview can optionally inline library code into your views so you only have
to maintain it in one place. It looks for any files named lib.* in your
design-doc directory (for doc specific libs) and in the parent views directory
(for project global libs). These libraries are only inserted into views which
include the text

//include-lib

or

#include-lib

Couchview is a result of scratching my own itch. I'd be happy to make it more
general, so please contact me at jchris@grabb.it if you'd like to see anything
added or changed.
PUSH
  end
  exit
end

require 'rubygems'
require 'couchrest'

if command == 'push'
  dirname = ARGV[1]
  dbname = ARGV[2]
  puts "Pushing views from directory #{dirname} to database #{dbname}"
  fm = CouchRest::FileManager.new(dbname)
  # fm.loud = true
  fm.push_views(dirname)
elsif command == 'pull'
end


__END__





dbname = ARGV[1]
dirname = ARGV[2] || "views"

puts "Running #{command} on #{dbname} from directory #{dirname}."

require 'rubygems'
require 'couchrest'

case command
when "push" # files to views
  
  
  
when "pull" # views to files
  ds = db.documents(:startkey => '_design/', :endkey => '_design/ZZZZZZZZZ')
  ds['rows'].collect{|r|r['id']}.each do |id|
    puts directory = id.split('/').last
    FileUtils.mkdir_p(File.join("views",directory))
    views = db.get(id)['views']
    
    vgroups = views.keys.group_by{|k|k.sub(/\-(map|reduce)$/,'')}
    vgroups.each do|g,vs|
      mapname = vs.find {|v|views[v]["map"]}
      if mapname
        # save map
        mapfunc = views[mapname]["map"]
        mapfile = File.join(dirname,directory,"#{g}-map.js") # todo support non-js views
        File.open(mapfile,'w') do |f|
          f.write mapfunc
        end
      end
      
      reducename = vs.find {|v|views[v]["reduce"]}
      if reducename
        # save reduce
        reducefunc = views[reducename]["reduce"]
        reducefile = File.join(dirname,directory,"#{g}-reduce.js") # todo support non-js views
        File.open(reducefile,'w') do |f|
          f.write reducefunc
        end
      end
    end
  end  
end