HLS Plugin to provide Alternate Literal Formats.

.github/workflows/test.yml

@@ -224,6 +224,11 @@ jobs:
         name: Test hls-hlint-plugin test suite
         run: cabal test hls-hlint-plugin --test-options="-j1 --rerun-update" || cabal test hls-hlint-plugin --test-options="-j1 --rerun" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-hlint-plugin --test-options="-j1 --rerun"
 
+      - if: matrix.test
+        name: Test hls-alternate-number-format-plugin test suite
+        run: cabal test hls-alternate-number-format-plugin --test-options="-j1 --rerun-update" || cabal test hls-alternate-number-format-plugin --test-options="-j1 --rerun" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-alternate-number-format-plugin --test-options="-j1 --rerun"
+
+
   test_post_job:
     if: always()
     runs-on: ubuntu-latest

cabal-ghc901.project

@@ -24,6 +24,7 @@ packages:
          ./plugins/hls-module-name-plugin
          ./plugins/hls-ormolu-plugin
          ./plugins/hls-call-hierarchy-plugin
+         ./plugins/hls-alternate-number-format-plugin
 
 with-compiler: ghc-9.0.1
 

cabal-ghc921.project

@@ -23,6 +23,7 @@ packages:
          ./plugins/hls-module-name-plugin
          ./plugins/hls-ormolu-plugin
          ./plugins/hls-call-hierarchy-plugin
+         ./plugins/hls-alternate-number-format-plugin
 
 with-compiler: ghc-9.2.1
 

cabal.project

@@ -24,6 +24,7 @@ packages:
          ./plugins/hls-module-name-plugin
          ./plugins/hls-ormolu-plugin
          ./plugins/hls-call-hierarchy-plugin
+         ./plugins/hls-alternate-number-format-plugin
 
 -- Standard location for temporary packages needed for particular environments
 -- For example it is used in the project gitlab mirror to help in the MAcOS M1 build script

exe/Plugins.hs

@@ -65,6 +65,10 @@ import           Ide.Plugin.Pragmas                as Pragmas
 import           Ide.Plugin.Splice                 as Splice
 #endif
 
+#if alternateNumberFormat
+import           Ide.Plugin.AlternateNumberFormat  as AlternateNumberFormat
+#endif
+
 -- formatters
 
 #if floskell
@@ -154,6 +158,9 @@ idePlugins includeExamples = pluginDescToIdePlugins allPlugins
 #endif
 #if splice
       Splice.descriptor "splice" :
+#endif
+#if alternateNumberFormat
+      AlternateNumberFormat.descriptor "alternateNumberFormat" :
 #endif
     -- The ghcide descriptors should come last so that the notification handlers
     -- (which restart the Shake build) run after everything else

haskell-language-server.cabal

@@ -156,6 +156,11 @@ flag splice
   default:     True
   manual:      True
 
+flag alternateNumberFormat
+  description: Enable Alternate Number Format plugin
+  default:     True
+  manual:      True
+
 -- formatters
 
 flag floskell
@@ -253,6 +258,11 @@ common splice
     build-depends: hls-splice-plugin ^>=1.0.0.1
     cpp-options: -Dsplice
 
+common alternateNumberFormat
+  if flag(alternateNumberFormat)
+    build-depends: hls-alternate-number-format-plugin ^>=1.0.0.0
+    cpp-options: -DalternateNumberFormat
+
 -- formatters
 
 common floskell
@@ -297,6 +307,7 @@ executable haskell-language-server
                     , moduleName
                     , pragmas
                     , splice
+                    , alternateNumberFormat
                     , floskell
                     , fourmolu
                     , ormolu

plugins/hls-alternate-number-format-plugin/LICENSE

@@ -0,0 +1,201 @@
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plugins/hls-alternate-number-format-plugin/README.md

@@ -0,0 +1,40 @@
+# Alternate Number Format Plugin
+
+The alternate number format plugin provides alternative formatting for Numeric Literals in source code.
+These can be any numeric literal such as `123`, `0x45` or any of the other numeric formats.
+The plugin is context aware and will provide suggestions based on currently active GHC extensions.
+
+## Setup
+
+The plugin requires no extra setup to work. Simply place your cursor on top of a literal and invoke the `codeAction` command for your editor.
+
+## Demo
+
+![Alternate format suggestions](HLSInt.gif)
+
+### Currently Supported GHC Extensions:
+- `BinaryLiterals`
+- `HexFloatLiterals`
+- `NumDecimalLiterals`
+
+## Design
+
+The plugin is relatively simple, it traverses a files source contents using the GHC API. As it encounters Literals (of the type `HsExpr` with the constructor of either `HsLit` or `HsOverLit`), it will construct an internal `Literal` datatype that has additional information for use to generate suggestions.
+Currently, the traversal is done in the file, `Literal.hs`, using the package [SYB](https://hackage.haskell.org/package/syb) for most of the heavy lifting.
+
+The plugin extends on top of SYB as the traversal done by basic combinators is not perfect. For whatever reason, when starting at the root `ParsedModule` the SYB traversal ignores Pattern Binds (`LPat GhcPs`). As a result, a combinator was created to match on TWO separate underlying types to dispatch on.
+
+To generate suggestions, the plugin leverages the `Numeric` package which provides a multitude of conversion functions to and from strings/numerics. The only slight change is the addition of extra work when using `NumDecimals` extension. The plugin will attempt to generate 3 choices for the user (this choice is not given for `Fractional` numerics).
+
+### Known Quirks
+- Currently (and probably inefficiently), a Set is used as general accumulator for all Literals being captured. This is because again, through the intricacies of using SYB, we somehow will traverse Source Text multiple times and collect duplicate literals.
+
+- In the Test Suite, we are required to be explicit in where our `codeActions` will occur. Otherwise, a simple call to `getAllCodeActions` will not work, for whatever reason, there is not enough time to generate the code actions.
+
+- `PrimLiterals` are currently ignored. GHC API does not attach Source Text to Primitive Literal Nodes. As such these are ignored in the plugin.
+
+- Similarly, anything that produces a bad Source Span (i.e. can't be easily replaced by an edit) is ignored as well.
+
+## Changelog
+### 1.0.0.0
+- First Release