Updated Julia language with lexer and added tests

lib/linguist/languages.yml

@@ -601,7 +601,7 @@ JavaScript:
 
 Julia:
   type: programming
-  lexer: Text only
+  lexer: Julia
   primary_extension: .jl
   extensions:
   - .jl

test/fixtures/stockcorr.jl

@@ -0,0 +1,37 @@
+## Test case from Issue #445
+
+#STOCKCORR - The original, unoptimised code that simulates two correlated assets
+function stockcorr()
+
+    ## Correlated asset information
+    CurrentPrice = [78. 102.]     # Initial Prices of the two stocks
+    Corr = [1. 0.4; 0.4 1.]       # Correlation Matrix
+    T = 500                       # Number of days to simulate = 2years = 500days
+    n = 100000                    # Number of simulations
+    dt = 1/250                    # Time step (1year = 250days)
+    Div=[0.01 0.01]               # Dividend
+    Vol=[0.2 0.3]                 # Volatility
+
+    ## Market Information
+    r = 0.03                      # Risk-free rate
+
+    ## Define storages
+    SimulPriceA = zeros(T,n)      # Simulated Price of Asset A
+    SimulPriceA[1,:] = CurrentPrice[1]
+    SimulPriceB = zeros(T,n)      # Simulated Price of Asset B
+    SimulPriceB[1,:] = CurrentPrice[2]
+
+    ## Generating the paths of stock prices by Geometric Brownian Motion
+    UpperTriangle=chol(Corr)      # UpperTriangle Matrix by Cholesky decomposition
+
+    for i = 1:n
+       Wiener = randn(T-1,2)
+       CorrWiener = Wiener*UpperTriangle
+       for j = 2:T
+          SimulPriceA[j,i] = SimulPriceA[j-1,i]*exp((r-Div[1]-Vol[1]^2/2)*dt+Vol[1]*sqrt(dt)*CorrWiener[j-1,1])
+          SimulPriceB[j,i] = SimulPriceB[j-1,i]*exp((r-Div[2]-Vol[2]^2/2)*dt+Vol[2]*sqrt(dt)*CorrWiener[j-1,2])
+       end
+    end
+
+    return (SimulPriceA, SimulPriceB)
+end

test/test_blob.rb

@@ -427,6 +427,9 @@ class TestBlob < Test::Unit::TestCase
 
     # Kotlin
     assert_equal Language['Kotlin'], blob("Foo.kt").language
+
+    # Julia: http://julialang.org/
+    assert_equal Language['Julia'], blob("stockcorr.jl").language
   end
 
   def test_lexer
@@ -438,6 +441,7 @@ class TestBlob < Test::Unit::TestCase
     assert_equal Lexer['Text only'], blob("README").lexer
     assert_equal Lexer['Tea'], blob("foo.tea").lexer
     assert_equal Lexer['vhdl'], blob("foo.vhd").lexer
+    assert_equal Lexer['Julia'], blob("stockcorr.jl").lexer
   end
 
   def test_shebang_script