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Use optparse for couchview. Implemented view generation option.

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This commit is contained in:
Geoffrey Grosenbach 2008-09-11 13:29:12 -07:00
parent 021121f22f
commit c5397a9b6b
6 changed files with 219 additions and 102 deletions
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1
.gitignore vendored Normal file
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@ -0,0 +1 @@
.DS_Store

144
bin/couchview
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@ -1,111 +1,53 @@
#!/usr/bin/env ruby
commands = %w{push generate}
require 'optparse'
require File.dirname(__FILE__) + "/../lib/couch_rest/commands"
command = ARGV[0]
# Set defaults
options = {
:loud => true,
}
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
Usage: couchview generate directory design1 design2 design3 ...
Couchview will create directories and example views for the design documents you specify.
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
opts = OptionParser.new do |opts|
opts.banner = "Usage: #$0 [options] (push|generate) directory database"
opts.on('-q', '--quiet', "Omit extra debug info") do
options[:loud] = false
end
opts.on_tail('-h', '--help [push|generate]', "Display detailed help and exit") do |help_command|
puts opts
case help_command
when "push"
puts CouchRest::Commands::Push.help
when "generate"
puts CouchRest::Commands::Generate.help
end
exit
end
end
opts.parse!(ARGV)
options[:command] = ARGV.shift
options[:directory] = ARGV.shift
options[:trailing_args] = ARGV
# There must be a better way to check for extra required args
unless (["push", "generate"].include?(options[:command]) && options[:directory] && options[:trailing_args])
puts(opts)
exit
end
require 'rubygems'
require 'couchrest'
# DEBUG
puts options.inspect
if command == 'push'
dirname = ARGV[1]
dbname = ARGV[2]
fm = CouchRest::FileManager.new(dbname)
fm.loud = true
puts "Pushing views from directory #{dirname} to database #{fm.db}"
fm.push_views(dirname)
elsif command == 'generate'
puts "Under construction ;)"
# The options hash now contains the resolved defaults
# and the overrides from the command line.
# Call your class and send it the options here
# cr = CouchRest::FileManager.new(options[:database_name])
case options[:command]
when "push"
CouchRest::Commands::Push.run(options)
when "generate"
CouchRest::Commands::Generate.run(options)
end

1
couchrest.gemspec
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@ -20,7 +20,6 @@ Gem::Specification.new do |s|
s.bindir = 'bin'
s.executables << 'couchview'
s.executables << 'couchdir'
s.executables << 'couchcontrol'
s.add_dependency("json", [">= 1.1.2"])
s.add_dependency("rest-client", [">= 0.5"])
end

5
lib/couch_rest/commands.rb Normal file
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require File.join(File.dirname(__FILE__), "..", "couchrest")
%w(push generate).each do |filename|
require File.join(File.dirname(__FILE__), "commands", filename)
end

71
lib/couch_rest/commands/generate.rb Normal file
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require 'fileutils'
class CouchRest
module Commands
module Generate
def self.run(options)
directory = options[:directory]
design_names = options[:trailing_args]
FileUtils.mkdir_p(directory)
filename = File.join(directory, "lib.js")
self.write(filename, <<-FUNC)
// Put global functions here.
// Include in your views with
//
// //include-lib
FUNC
design_names.each do |design_name|
subdirectory = File.join(directory, design_name)
FileUtils.mkdir_p(subdirectory)
filename = File.join(subdirectory, "sample-map.js")
self.write(filename, <<-FUNC)
function(doc) {
// Keys is first letter of _id
emit(doc._id[0], doc);
}
FUNC
filename = File.join(subdirectory, "sample-reduce.js")
self.write(filename, <<-FUNC)
function(keys, values) {
// Count the number of keys starting with this letter
return values.length;
}
FUNC
filename = File.join(subdirectory, "lib.js")
self.write(filename, <<-FUNC)
// Put functions specific to '#{design_name}' here.
// Include in your views with
//
// //include-lib
FUNC
end
end
def self.help
helpstring = <<-GEN
Usage: couchview generate directory design1 design2 design3 ...
Couchview will create directories and example views for the design documents you specify.
GEN
helpstring.gsub(/^ /, '')
end
def self.write(filename, contents)
puts "Writing #{filename}"
File.open(filename, "w") do |f|
# Remove leading spaces
contents.gsub!(/^ ( )?/, '')
f.write contents
end
end
end
end
end

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lib/couch_rest/commands/push.rb Normal file
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class CouchRest
module Commands
module Push
def self.run(options)
directory = options[:directory]
database = options[:trailing_args].first
fm = CouchRest::FileManager.new(database)
fm.loud = options[:loud]
puts "Pushing views from directory #{directory} to database #{fm.db}"
fm.push_views(directory)
end
def self.help
helpstring = <<-GEN
== 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.
GEN
helpstring.gsub(/^ /, '')
end
end
end
end