Merge pull request #14 from JensHeinrich/feature/freebsd-support

Add FreeBSD support

autoload/battery.vim

@@ -93,6 +93,8 @@ function! s:get_available_backend() abort
     return 'powershell'
   elseif battery#backend#linux#is_available()
     return 'linux'
+  elseif battery#backend#freebsd#is_available()
+    return 'freebsd'
   elseif battery#backend#termux#is_available()
     return 'termux'
   endif

autoload/battery/backend/freebsd.vim

@@ -0,0 +1,54 @@
+" Reference:
+" sysctl -d hw.acpi.battery
+"
+" hw.acpi.battery: battery status and info
+" hw.acpi.battery.info_expire: time in seconds until info is refreshed
+" hw.acpi.battery.units: number of batteries
+" hw.acpi.battery.state: current status flags
+"   discharging = 1
+"   charging = 2
+"   critical = 4
+" hw.acpi.battery.rate: present rate in mW
+" hw.acpi.battery.time: remaining time in minutes
+" hw.acpi.battery.life: percent capacity remaining
+
+let s:Job = vital#battery#import('System.Job')
+
+let s:BAT_STATUS = 'hw.acpi.battery.state'
+let s:BAT_CAPACITY = 'hw.acpi.battery.life'
+
+let s:job = v:null
+
+function! s:freebsd_update() abort dict
+  if type(s:job) is# v:t_dict && s:job.status() ==# 'run'
+    return
+  endif
+  let data = []
+  let args = ['sysctl', '-n', s:BAT_STATUS, s:BAT_CAPACITY]
+  let s:job = s:Job.start(args, {
+        \ 'on_stdout': funcref('s:on_stdout', [data]),
+        \ 'on_exit': funcref('s:on_exit', [self, data]),
+        \})
+endfunction
+
+function! s:on_stdout(buffer, data) abort
+  call extend(a:buffer, a:data)
+endfunction
+
+function! s:on_exit(backend, buffer, exitval) abort
+  let data = filter(a:buffer, '!empty(v:val)')
+  let a:backend.is_charging = get(data, 0, '') !=# 'NOT_CHARGING'
+  let a:backend.value = get(data, 1, '') + 0
+endfunction
+
+function! battery#backend#freebsd#define() abort
+  return {
+        \ 'value': -1,
+        \ 'is_charging': -1,
+        \ 'update': funcref('s:freebsd_update'),
+        \}
+endfunction
+
+function! battery#backend#freebsd#is_available() abort
+  return executable('sysctl')
+endfunction