Change Install function to accept a dictionary of options.

README.md

@@ -23,7 +23,7 @@ Features include:
 1. Add this to your `vimrc`/`Init.vim`
 ```vimL
 
-Plug 'yatli/coc-powershell', {'do': { -> coc#powershell#install()} }
+Plug 'yatli/coc-powershell', {'do': { -> coc#powershell#install({})} }
 ...
 Plug 'neoclide/coc.nvim', {'tag': '*', 'do': { -> coc#util#install()}} 
 ```

autoload/coc/powershell.vim

@@ -4,28 +4,30 @@ let s:is_mac         = !s:is_win && !has('win32unix')
       \ && (has('mac') || has('macunix') || has('gui_macvim') ||
       \   (!isdirectory('/proc') && executable('sw_vers')))
 let s:is_vim         = !has('nvim')
-if(!exists("g:coc_powershell_prerelease"))
-    let g:coc_powershell_prerelease  = ''
-endif
+let s:install_script = s:root.'/install.ps1'
 
-let s:install_script = s:root.'/install.ps1 '.g:coc_powershell_prerelease
-
-if(s:is_mac)
-    let s:install_script = 'pwsh '.s:install_script
-endif
-
-if(s:is_win)
-    let s:powershell_executable = "powershell"
-    if(executable("pwsh"))
-        let s:powershell_executable = "pwsh"
+function! coc#powershell#install(options)
+    if(exists('a:options.flags'))
+        let s:flags = a:options.flags
+    else
+	let s:flags = ''
     endif
+    if(exists('a:options.powershellExecutable'))
+        let s:powershell_executable = a:options.powershellExecutable
+    else
+        if(s:is_mac)
+            let s:powershell_executable = 'pwsh'
+        endif
 
-    let s:install_script = s:powershell_executable.' '.s:install_script
-endif
-
-function! coc#powershell#install()
+        if(s:is_win)
+            let s:powershell_executable = "powershell"
+            if(executable("pwsh"))
+                let s:powershell_executable = "pwsh"
+            endif
+        endif
+    endif
     let cwd = getcwd()
     exe 'lcd '.s:root
-    exe '!'.s:install_script
+    exe '!'.s:powershell_executable.' '.s:install_script.' '.s:flags
     exe 'lcd '.cwd
 endfunction