Define a semantic-source package.

cabal.project

@@ -1,4 +1,4 @@
-packages: . semantic-core semantic-python
+packages: . semantic-core semantic-python semantic-source
 
 jobs: $ncpus
 

semantic-source/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2015-2019 GitHub
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

semantic-source/README.md

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+# semantic-source
+
+Types and functionality for working with source code (program text).
+
+
+## Development
+
+This project consists of a Haskell package named `semantic-source`. The library’s sources are in [`src`][].
+
+Development of `semantic-source` is typically done using `cabal v2-build`:
+
+```shell
+cabal v2-build # build the library
+cabal v2-repl  # load the package into ghci
+cabal v2-test  # build and run the doctests
+```
+
+[`src`]: https://github.com/github/semantic/tree/master/semantic-source/src

semantic-source/Setup.hs

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+import Distribution.Simple
+main = defaultMain

semantic-source/semantic-source.cabal

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+cabal-version:       2.4
+
+name:                semantic-source
+version:             0.0.0.0
+synopsis:            Types and functionality for working with source code
+description:         Types and functionality for working with source code (program text).
+homepage:            https://github.com/github/semantic/tree/master/semantic-source#readme
+bug-reports:         https://github.com/github/semantic/issues
+license:             MIT
+license-file:        LICENSE
+author:              The Semantic authors
+maintainer:          opensource+semantic@github.com
+copyright:           (c) 2019 GitHub, Inc.
+category:            Data
+build-type:          Simple
+stability:           alpha
+extra-source-files:
+  README.md
+
+
+tested-with:
+  GHC == 8.6.5
+
+common common
+  default-language: Haskell2010
+  ghc-options:
+    -Weverything
+    -Wno-missing-local-signatures
+    -Wno-missing-import-lists
+    -Wno-implicit-prelude
+    -Wno-safe
+    -Wno-unsafe
+    -Wno-name-shadowing
+    -Wno-monomorphism-restriction
+    -Wno-missed-specialisations
+    -Wno-all-missed-specialisations
+    -Wno-star-is-type
+
+library
+  import: common
+  -- exposed-modules:
+  -- other-modules:
+  -- other-extensions:
+  build-depends:
+      base >= 4.12 && < 5
+  hs-source-dirs: src
+
+test-suite doctest
+  import: common
+  type: exitcode-stdio-1.0
+  main-is: Doctest.hs
+  build-depends:
+      base
+    , doctest >=0.7 && <1.0
+  hs-source-dirs: test
+
+source-repository head
+  type:     git
+  location: https://github.com/github/semantic

semantic-source/test/Doctest.hs

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+module Main
+( main
+) where
+
+import System.Environment
+import Test.DocTest
+
+main :: IO ()
+main = do
+  args <- getArgs
+  autogen <- fmap (<> "/build/doctest/autogen") <$> lookupEnv "HASKELL_DIST_DIR"
+  doctest (maybe id ((:) . ("-i" <>)) autogen ("-isemantic-source/src" : "--fast" : if null args then ["semantic-source/src"] else args))