create index and tests

Author: aekeus

README.md

@@ -24,6 +24,12 @@ verdb status
 verdb up all
 ```
 
+```
+verdb gen trigger students --table=students --func=log_students
+verdb gen table instructors --table=instructors
+verdb gen index instructors-index --table=instructors --fields=name,location
+```
+
 # install
 
 With [npm](https://npmjs.org) do:

lib/generate.coffee

@@ -1,5 +1,6 @@
 trigger = require './generators/trigger'
 table   = require './generators/table'
+index   = require './generators/index'
 
 exports.dispatch = (nconf, params) ->
   type = params?[0] or throw "type required"
@@ -8,5 +9,6 @@ exports.dispatch = (nconf, params) ->
   switch type
     when 'trigger' then trigger.generate batch, params, nconf
     when 'table'   then table.generate batch, params, nconf
+    when 'index'   then index.generate batch, params, nconf
     else
       throw "unknown type #{type}"

lib/generators/index.coffee

@@ -0,0 +1,22 @@
+fs = require 'fs'
+utils = require '../utils'
+
+exports.inject = (_utils) ->
+  utils = _utils
+
+exports.index_name = (nconf, table, fields) ->
+  if nconf.get("index")
+    nconf.get("index")
+  else
+    "#{table}_#{fields.replace(new RegExp(',','gi'), '_')}_idx"
+
+exports.generate = (batch, params, nconf) ->
+  table_name = nconf.get("table")   or throw "table required"
+  fields     = nconf.get("fields")  or throw "fields required"
+  name       = exports.index_name(nconf, table_name, fields)
+
+  up_buf = "CREATE INDEX #{name} ON #{table_name}(#{fields});"
+  down_buf = "DROP INDEX #{name};"
+
+  utils.create_batch batch, up_buf, down_buf, nconf, (err) ->
+    console.log err if err?

lib/generators/table.coffee

@@ -16,7 +16,7 @@ DROP TABLE __TABLE__;
 exports.inject = (_utils) ->
   utils = _utils
 
-exports.generate = (batch, params, nconf, persist) ->
+exports.generate = (batch, params, nconf) ->
   table_name    = nconf.get("table")   or throw "table required"
 
   up_buf = up_template

package.json

@@ -1,7 +1,7 @@
 {
   "name": "verdb",
   "description": "database version control",
-  "version": "0.0.7",
+  "version": "0.0.8",
   "author": "Aubrey Keus <[email protected]>",
   "homepage": "https://github.com/aekeus/verdb",
   "bugs": "https://github.com/aekeus/verdb/issues",

test/gen.coffee

@@ -2,6 +2,42 @@
 test = require('tap').test
 trg = require '../lib/generators/trigger'
 tbl = require '../lib/generators/table'
+idx = require '../lib/generators/index'
+
+test "generate index", (t) ->
+  t.plan 5
+  nconf =
+    get: (k) ->
+
+  t.throws ->
+    idx.generate "blah", [], nconf, ->
+  , "table required"
+
+  nconf =
+    get: (k) ->
+      switch k
+        when table then 'instructors'
+
+  t.throws ->
+    idx.generate "blah", [], nconf, ->
+  , "fields required"
+
+  nconf =
+    get: (k) ->
+      switch k
+        when "table" then "instructors"
+        when "fields" then "a,b,c"
+
+  utils =
+    create_batch: (batch, up_buf, down_buf, nconf, cb) ->
+      t.equal batch, "instructor-batch", "correct batch"
+      t.equal up_buf, "CREATE INDEX instructors_a_b_c_idx ON instructors(a,b,c);", "create index"
+      t.ok down_buf.match(/DROP INDEX instructors_a_b_c_idx;/), "drop index"
+
+  idx.inject utils
+  idx.generate "instructor-batch", [], nconf, ->
+
+  t.end()
 
 test "generate table", (t) ->
   t.plan 4