custom version parser and comparer

semver apparently cant handle version numbers with more
than two dots
e.g.: 0.9.15.1

lib/idris-model.coffee

@@ -3,7 +3,6 @@ parse = require './parse'
 utils = require('./utils')
 EventEmitter = require('events').EventEmitter
 {Logger} = require './Logger'
-semver = require 'semver'
 
 class IdrisModel extends EventEmitter
   constructor: (@version) ->
@@ -18,8 +17,9 @@ class IdrisModel extends EventEmitter
 
   start: ->
     pathToIdris = atom.config.get("language-idris.pathToIdris")
+
     ideCommand =
-      if semver.gt @version, '0.9.16'
+      if utils.versionGreaterEq @version, [0, 9, 16]
         '--ide-mode'
       else
         '--ideslave'

lib/language-idris.coffee

@@ -3,7 +3,6 @@ IdrisController = require './idris-controller'
 IdrisModel = require './idris-model'
 {CompositeDisposable} = require 'atom'
 utils = require './utils'
-semver = require 'semver'
 
 module.exports =
   config:
@@ -22,8 +21,8 @@ module.exports =
     #    and switch to ideslave for older ones
     idrisVersionPromise = utils.execPromise "#{pathToIdris} --version --nobanner"
 
-    idrisVersionPromise.then ((vers) ->
-      Promise.resolve semver.clean(vers.trim().replace('-', ''))
+    idrisVersionPromise.then ((version) ->
+      Promise.resolve utils.parseVersion(version)
     ), (error) ->
       atom.notifications.addWarning warningNoIdris
     .then @startIdrisProcesses

lib/utils.coffee

@@ -1,5 +1,28 @@
 exec = require('child_process').exec
 
+parseVersion = (vers) ->
+  vers.trim().replace('-', '').split('.').map (n) ->
+    parseInt n, 10
+
+versionGreaterEq = (a, b) ->
+
+  padArray = (length, ary) ->
+    if ary.length < length
+      ary.concat (0 for _ in [0...length-ary.length])
+    else
+      ary
+
+  zip2 = (a, b) ->
+    for i in [0...a.length]
+      [a[i], b[i]]
+
+  maxLength = Math.max a.length, b.length
+  a = padArray maxLength, a
+  b = padArray maxLength, b
+  zip2(a, b)
+    .map ([a, b]) -> a >= b
+    .reduce ((acc, xs) -> if !acc then acc else xs), true
+
 execPromise = (command, args) ->
   promise = new Promise (resolve, reject) ->
     process = exec command, args
@@ -47,6 +70,8 @@ formatSexp = (sexp) ->
     sexp
 
 module.exports =
+  parseVersion: parseVersion
+  versionGreaterEq: versionGreaterEq
   execPromise: execPromise
   serialize: serialize
   hexLength: hexLength

package.json

@@ -24,7 +24,6 @@
     "atom-message-panel": ">=0.1.0",
     "atom-space-pen-views": "^2.0.3",
     "bennu": "17.3.0",
-    "nu-stream": "3.3.1",
-    "semver": "4.3.4"
+    "nu-stream": "3.3.1"
   }
 }

spec/version-spec.coffee

@@ -0,0 +1,14 @@
+utils = require '../lib/utils'
+
+describe "The version", ->
+  it "should parse correctly.", ->
+    expect(utils.parseVersion('0.9.15.1')).toEqual([0, 9, 15, 1])
+    expect(utils.parseVersion('0.9.17')).toEqual([0, 9, 17])
+    expect(utils.parseVersion('0.9.18-')).toEqual([0, 9, 18])
+    expect(utils.parseVersion("0.9.18-\n")).toEqual([0, 9, 18])
+
+  it "should compare correctly.", ->
+    expect(utils.versionGreaterEq([0, 9, 15, 1], [0, 9, 17])).toEqual(false)
+    expect(utils.versionGreaterEq([0, 9, 14], [0, 9, 17])).toEqual(false)
+    expect(utils.versionGreaterEq([0, 9, 18], [0, 9, 17])).toEqual(true)
+    expect(utils.versionGreaterEq([0, 9, 17], [0, 9, 17])).toEqual(true)