Delete HLS installer scripts

Prefer ghcup for installations from source.

Author: fendor

cabal-hls-install

@@ -26,7 +26,17 @@ You can check if HLS is available for your platorm via ghcup here: <https://hask
 You can also install HLS from source without checking out the code manually:
 
 ```bash
-ghcup compile hls -v 1.4.0 8.10.7
+ghcup compile hls -v 1.6.1.0 --ghc 8.10.7
+```
+
+Install HLS for multiple GHC versions:
+```
+ghcup compile hls -v 1.6.1.0 --ghc 8.10.7 --ghc 8.8.4
+```
+
+Use a different `cabal.project` for a GHC version:
+```
+ghcup compile hls -v 1.6.1.0 --ghc 9.2.1 --cabal-project https://github.com/haskell/haskell-language-server/blob/master/cabal-ghc921.project
 ```
 
 Check `ghcup compile hls --help` for a full list of compilation options.
@@ -83,147 +93,6 @@ pkg install hs-haskell-language-server
 to install it. At the moment, HLS installed this way only supports the same GHC
 version as the ports one.
 
-## Installation from source
-
-### Common pre-requirements
-
-- `stack` or `cabal` must be in your PATH
-  - You need stack version >= 2.1.1 or cabal >= 2.4.0.0
-- `git` must be in your PATH
-- The directory where `stack`or `cabal` put the binaries must be in you PATH:
-  - For stack you can get it with `stack path --local-bin`
-  - For cabal it is by default `$HOME/.cabal/bin` in linux and `%APPDATA%\cabal\bin` in windows.
-
-Tip: you can quickly check if some command is in your path by running the command.
-If you receive some meaningful output instead of "command not found"-like message
-then it means you have the command in PATH.
-
-### Linux-specific pre-requirements
-
-On Linux you will need install a couple of extra libraries:
-
-- [Unicode (ICU)](http://site.icu-project.org/)
-- [NCURSES](https://www.gnu.org/software/ncurses/)
-- [Zlib](https://zlib.net/)
-
-**Debian 9/Ubuntu 18.04 or earlier**:
-
-```bash
-sudo apt install libicu-dev libtinfo-dev libgmp-dev zlib1g-dev
-```
-
-**Debian 10/Ubuntu 18.10 or later**:
-
-```bash
-sudo apt install libicu-dev libncurses-dev libgmp-dev zlib1g-dev
-```
-
-**Fedora**:
-
-```bash
-sudo dnf install libicu-devel ncurses-devel zlib-devel
-```
-
-### Windows-specific pre-requirements
-
-In order to avoid problems with long paths on Windows you can do either one of the following:
-
-1. Clone the `haskell-language-server` to a short path, for example the root of your logical drive (e.g. to
-   `C:\hls`). Even if you choose `C:\haskell-language-server` you could hit the problem. If this doesn't work or you want to use a longer path, try the second option.
-
-2. If the `Local Group Policy Editor` is available on your system, go to: `Local Computer Policy -> Computer Configuration -> Administrative Templates -> System -> Filesystem` set `Enable Win32 long paths` to `Enabled`. If you don't have the policy editor you can use regedit by using the following instructions [here](https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#enable-long-paths-in-windows-10-version-1607-and-later). You also need to configure git to allow longer paths by using unicode paths. To set this for all your git repositories use `git config --system core.longpaths true` (you probably need an administrative shell for this) or for just this one repository use `git config core.longpaths true`.
-
-In addition make sure `haskell-language-server.exe` is not running by closing your editor, otherwise in case of an upgrade the executable can not be installed.
-
-### Download the source code
-
-```bash
-git clone https://github.com/haskell/haskell-language-server --recurse-submodules
-cd haskell-language-server
-```
-
-### Building
-
-Note, on first invocation of the build script with stack, a GHC is being installed for execution.
-The GHC used for the `install.hs` can be adjusted in `./install/stack.yaml` by using a different resolver.
-
-Available commands can be seen with:
-
-```bash
-stack ./install.hs help
-```
-
-Remember, this will take time to download a Stackage-LTS and an appropriate GHC for build
-haskell-language-server the first time.
-
-### Install via cabal
-
-The install-script can be invoked via `cabal` instead of `stack` with the command
-
-```bash
-cabal v2-run ./install.hs --project-file install/shake.project <target>
-```
-
-or using the existing alias script
-
-```bash
-./cabal-hls-install <target>
-```
-
-Running the script with cabal on windows requires a cabal version greater or equal to `3.0.0.0`.
-
-For brevity, only the `stack`-based commands are presented in the following sections.
-
-### Install specific GHC Version
-
-The script will install the executables `haskell-language-server-wrapper` and `haskell-language-server`.
-
-It will copy the latter appending the used ghc version, needed by the wrapper to choose the suitable version
-for the project at hand.
-
-So installing the executables directly with `stack install` or `cabal v2-install` may not be enough
-for it to work properly.
-
-Install haskell-language-server for the latest available and supported GHC version (and hoogle docs):
-
-```bash
-stack ./install.hs hls
-```
-
-Install haskell-language-server for a specific GHC version (and hoogle docs):
-
-```bash
-stack ./install.hs hls-8.10.7
-```
-
-`hls-8.10.7` target will build the project and install `haskell-language-server-wrapper`,
-`haskell-language-server` and `haskell-language-server-8.10.7` executables.
-
-The Haskell Language Server can also be built with `cabal v2-build` instead of `stack build`.
-This has the advantage that you can decide how the GHC versions have been installed.
-To see what GHC versions are available, the command `cabal-hls-install ghcs` can be used.
-It will list all *supported* GHC versions that are on the path for build with their respective installation directory.
-If you think, this list is incomplete, you can try to modify the PATH variable, such that the executables can be found.
-Note, that the targets `hls` and `data` depend on the found GHC versions.
-
-An example output is:
-
-```bash
-> ./cabal-hls-install ghcs
-******************************************************************
-Found the following GHC paths:
-ghc-8.6.5: /opt/bin/ghc-8.6.5
-ghc-8.8.4: /opt/bin/ghc-8.8.4
-
-******************************************************************
-```
-
-If your desired ghc has been found, you use it to install haskell-language-server.
-
-```bash
-./cabal-hls-install hls-8.6.5
-```
-
 ## Installation from Hackage
 
 Direct installation from Hackage, while possible via `cabal install haskell-language-server`, is not recommended for most people.