From d9cd40f9d84e104207f8ef34c6d5a4f9d1b3af4b Mon Sep 17 00:00:00 2001
From: Brad Richardson <brichardson@structint.com>
Date: Tue, 25 Feb 2020 11:18:40 -0800
Subject: Add bare minimum of command line parsing

---
 app/Main.hs     | 41 +++++++++++++++++++++++++++++++++++++++--
 package.yaml    |  1 +
 stack.yaml      |  2 +-
 stack.yaml.lock |  8 ++++----
 4 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/app/Main.hs b/app/Main.hs
index de1c1ab..9d9c5dc 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,6 +1,43 @@
 module Main where
 
-import Lib
+import           Options.Applicative
+
+newtype Arguments = Arguments { command' :: Command }
+
+data Command = Run | Test | Build
 
 main :: IO ()
-main = someFunc
+main = do
+    args <- getArguments
+    run args
+
+run :: Arguments -> IO ()
+run args = case command' args of
+    Run   -> putStrLn "Run"
+    Test  -> putStrLn "Test"
+    Build -> putStrLn "Build"
+
+getArguments :: IO Arguments
+getArguments = execParser
+    (info
+        (arguments <**> helper)
+        (fullDesc <> progDesc "Work with Fortran projects" <> header
+            "fpm - A Fortran package manager and build system"
+        )
+    )
+
+arguments :: Parser Arguments
+arguments = subparser
+    (  command "run"   (info runArguments (progDesc "Run the executable"))
+    <> command "test"  (info testArguments (progDesc "Run the tests"))
+    <> command "build" (info buildArguments (progDesc "Build the executable"))
+    )
+
+runArguments :: Parser Arguments
+runArguments = pure $ Arguments Run
+
+testArguments :: Parser Arguments
+testArguments = pure $ Arguments Test
+
+buildArguments :: Parser Arguments
+buildArguments = pure $ Arguments Build
diff --git a/package.yaml b/package.yaml
index ab3a1d0..2cf73a8 100644
--- a/package.yaml
+++ b/package.yaml
@@ -21,6 +21,7 @@ description:         Please see the README on GitHub at <https://github.com/gith
 
 dependencies:
 - base >= 4.7 && < 5
+- optparse-applicative
 
 library:
   source-dirs: src
diff --git a/stack.yaml b/stack.yaml
index 465f104..0094ee9 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-15.1
+resolver: lts-12.26
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
diff --git a/stack.yaml.lock b/stack.yaml.lock
index 7e51098..6bee1e8 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 489011
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/15/1.yaml
-    sha256: d4ecc42b7125d68e4c3c036a08046ad0cd02ae0d9efbe3af2223a00ff8cc16f3
-  original: lts-15.1
+    size: 509471
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/12/26.yaml
+    sha256: 95f014df58d0679b1c4a2b7bf2b652b61da8d30de5f571abb0d59015ef678646
+  original: lts-12.26
-- 
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