Attempt to fix WSL Support (#56)

* attempt to fix wsl

* attempt to fix wsl; added missing comma

* attempt to fix wsl; added -Command

* attempt to fix wsl; added -Command

* attempt to fix wsl; added -Command

.gitignore

@@ -1,2 +1,3 @@
 test/vendor/*/
 doc/tags
+.vs/

lua/battery/parsers/init.lua

@@ -13,6 +13,7 @@ M.parsers = {
   powersupply = require('battery.parsers.powersupply'),
   acpi = require('battery.parsers.acpi'),
   termux_api = require('battery.parsers.termux-api'),
+  wsl = require('battery.parsers.wsl'),
 }
 
 return M

lua/battery/parsers/powersupply.lua

@@ -92,7 +92,7 @@ end
 ---Check if this parser would work in the current environment
 ---@return boolean
 function M.check()
-  return file.is_readable_directory('/sys/class/power_supply/')
+  return file.is_readable_directory('/sys/class/power_supply/') and vim.fn.has('wsl') == 0
 end
 
 return M

lua/battery/parsers/wsl.lua

@@ -0,0 +1,54 @@
+-- Get battery info using PowerShell in WSL. Requires Windows Subsystem for Linux (WSL)
+
+local M = {}
+
+local J = require('plenary.job')
+local L = require('plenary.log')
+local log = L.new({ plugin = 'battery' })
+
+local get_battery_info_powershell_command = {
+  'Get-WmiObject -Class Win32_Battery | Select-Object -ExpandProperty EstimatedChargeRemaining',
+}
+
+---Parse the response from the battery info job and update
+---the battery status
+---@param result string[]
+---@param battery_status BatteryStatus
+local function parse_wsl_battery_info(result, battery_status)
+    log.debug("WSL Battery Info Result: ", vim.inspect(result))
+    local battery_info = result[1] and result[1]:match('%d+')
+    if battery_info then
+      battery_status.percent_charge_remaining = tonumber(battery_info)
+      battery_status.ac_power = false
+      battery_status.battery_count = 1
+    else
+      battery_status.percent_charge_remaining = 100
+      battery_status.ac_power = true
+      battery_status.battery_count = 0
+    end
+end
+
+---@param battery_status BatteryStatus
+---@return unknown # Plenary job
+function M.get_battery_info_job(battery_status)
+  return J:new({
+    command = '/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe',
+    args = { '-Command', table.concat(get_battery_info_powershell_command, ' ') },
+    on_exit = function(j, return_value)
+      if return_value == 0 then
+        parse_wsl_battery_info(j:result(), battery_status)
+        log.debug(vim.inspect(battery_status))
+      else
+        log.error(vim.inspect(j:result()))
+      end
+    end,
+  })
+end
+
+---Check if this parser would work in the current environment
+---@return boolean
+function M.check()
+  return vim.fn.has 'wsl' == 1
+end
+
+return M