Fixes #92, configurable temps; help text & docs clean-up; versions are now built into binaries at compile time; clean up old extensions params; adds --list command; adds --write-config command; fixes bug in colorscheme loading; fixes bug in Colorschemes -- all had empty Name attrs; adds ability to list devices.

15 files changed, 313 insertions, 87 deletions

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 191b144..6390f46 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -29,5 +29,3 @@ jobs:
           repository: xxxserxxx/gotop-linux
           event-type: my-release
           client-payload: '{"tag": "${{ steps.tag_name.outputs.tag }}"}'
-
-# TODO: Build the plugins too
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f61b2c9..5b67eab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ignore lines matching `/^#.*/` in layout files.
 - Instructions for Gentoo (thanks @tormath1!)
 - Graph labels that don't fit (vertically) in the window are now drawn in additional columns (#40)
+- Adds ability to filter reported temperatures (#92)
 
 ### Changed
 
@@ -44,6 +45,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Memory line colors were inconsistently assigned (#91)
 - The disk code was truncating values instead of rounding (#90)
 - Temperatures on Darwin were all over the place, and wrong (#48)
+- Config file loading from `~/.config/gotop` wasn't working
 
 ## [3.5.1] - 2020-04-09 
 
diff --git a/README.md b/README.md
index 5b3ce0f..fd37437 100644
--- a/README.md
+++ b/README.md
@@ -127,12 +127,30 @@ Move `gotop` to somewhere in your `$PATH`.
 - click to select process
 - mouse wheel to scroll through processes
 
+### Config file
+
+Most command-line settings can be persisted into a configuration file. The config file is named `gotop.conf` and can be located in several places. The first place gotop will look is in the current directory; after this, the locations depend on the OS and distribution. On Linux using XDG, for instance, the home location of `~/.config/gotop/gotop.conf` is the second location. The last location is a system-wide global location, such as `/etc/gotop/gotop.conf`. The `-h` help command will print out all of the locations, in order. Command-line options override values in any config files, and only the first config file found is loaded.
+
+A configuration file can be created using the `--write-config` command-line argument. This will try to place the config file in the home config directory (the second location), but if it's unable to do so it'll write a file to the current directory.
+
+Config file changes can be made by combining command-line arguments with `--write-config`. For example, to persist the `solarized` theme, call:
+
+```
+gotop -c solarized --write-config
+```
+
 ### Colorschemes
 
 gotop ships with a few colorschemes which can be set with the `-c` flag followed by the name of one. You can find all the colorschemes in the [colorschemes folder](./colorschemes).
 
 To make a custom colorscheme, check out the [template](./colorschemes/template.go) for instructions and then use [default.json](./colorschemes/default.json) as a starter. Then put the file at `~/.config/gotop/<name>.json` and load it with `gotop -c <name>`. Colorschemes PR's are welcome!
 
+To list all built-in color schemes, call:
+
+```
+gotop --list colorschemes
+```
+
 ### Layouts
 
 gotop can parse and render layouts from a specification file.  The format is
@@ -206,6 +224,49 @@ and these are separated by spaces.
 Yes, you're clever enough to break the layout algorithm, but if you try to
 build massive edifices, you're in for disappointment.
 
+To list all built-in color schemes, call:
+
+```
+gotop --list layouts
+```
+
+### Device filtering
+
+Some devices have quite a number of data points; on OSX, for instance, there are dozens of temperature readings. These can be filtered through a configuration file.  There is no command-line argument for this filter.
+
+The list will grow, but for now the only device that supports filtering is the temperature widget.  The configuration entry is called `temperature`, and it contains an exact-match list of comma-separated values with no spaces.  To see the list of valid values, run gotop with the `--list devices` command.  Gotop will print out the type of device and the legal values.  For example, on Linux:
+
+```
+$ gotop --list devices
+Temperatures:
+        acpitz
+        nvme_composite
+        nvme_sensor1
+        nvme_sensor2
+        pch_cannonlake
+        coretemp_packageid0
+        coretemp_core0
+        coretemp_core1
+        coretemp_core2
+        coretemp_core3
+        ath10k_hwmon
+```
+You might then add the following line to the config file.  First, find where gotop looks for config files:
+```
+$ gotop -h | tail -n 6
+Colorschemes & layouts that are not built-in are searched for (in order) in:
+/home/USER/workspace/gotop.d/gotop, /home/USER/.config/gotop, /etc/xdg/gotop
+The first path in this list is always the cwd. The config file
+'gotop.config' can also reside in one of these directories.
+
+Log files are stored in /home/ser/.cache/gotop/errors.log
+```
+So you might use `/home/YOU/.config/gotop.conf`, and add (or modify) this line:
+```
+temperatures=acpitz,coretemp_core0,ath10k_hwmon
+```
+This will cause the temp widget to show only four of the eleven temps.
+
 ### CLI Options
 
 Run `gotop -h` to see the list of all command line options.
diff --git a/cmd/gotop/main.go b/cmd/gotop/main.go
index f44d7a2..18525c6 100644
--- a/cmd/gotop/main.go
+++ b/cmd/gotop/main.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"sort"
 	"strconv"
 	"strings"
 	"syscall"
@@ -20,6 +21,7 @@ import (
 
 	"github.com/xxxserxxx/gotop/v3"
 	"github.com/xxxserxxx/gotop/v3/colorschemes"
+	"github.com/xxxserxxx/gotop/v3/devices"
 	"github.com/xxxserxxx/gotop/v3/layout"
 	"github.com/xxxserxxx/gotop/v3/logging"
 	w "github.com/xxxserxxx/gotop/v3/widgets"
@@ -37,8 +39,8 @@ const (
 )
 
 var (
-	// TODO: Set this at compile time; having to check this in sucks.
-	Version      = "3.6.dev"
+	Version      = "0.0.0"
+	BuildDate    = "Hadean"
 	conf         gotop.Config
 	help         *w.HelpMenu
 	bar          *w.StatusBar
@@ -48,17 +50,14 @@ var (
 
 // TODO: Add tab completion for Linux https://gist.github.com/icholy/5314423
 // TODO: state:merge #135 linux console font (cmatsuoka/console-font)
-// TODO: state:deferred 157 FreeBSD fixes & Nvidia GPU support (kraust/master). Significant CPU use impact for NVidia changes.
-// TODO: Virtual devices from Prometeus metrics @feature
 // TODO: Abstract out the UI toolkit.  mum4k/termdash, VladimirMarkelov/clui, gcla/gowid, rivo/tview, marcusolsson/tui-go might work better for some OS/Archs. Performance/memory use comparison would be interesting.
-// TODO: Add fans
 func parseArgs(conf *gotop.Config) error {
 	cds := conf.ConfigDir.QueryFolders(configdir.All)
 	cpaths := make([]string, len(cds))
 	for i, p := range cds {
 		cpaths[i] = p.Path
 	}
-	usage := fmt.Sprintf(`
+	usage := fmt.Sprintln(`
 Usage: gotop [options]
 
 Options:
@@ -77,40 +76,15 @@ Options:
   -l, --layout=NAME       Name of layout spec file for the UI.  Looks first in $XDG_CONFIG_HOME/gotop, then as a path.  Use "-" to pipe.
   -i, --interface=NAME    Select network interface [default: all]. Several interfaces can be defined using comma separated values. Interfaces can also be ignored using !
   -x, --export=PORT       Enable metrics for export on the specified port.
-  -X, --extensions=NAMES  Enables the listed extensions.  This is a comma-separated list without the .so suffix. The current and config directories will be searched.
       --mbps              Net widget shows mb(its)ps for RX/TX instead of scaled bytes per second.
       --test              Runs tests and exits with success/failure code.
-      --print-paths       List out the paths that gotop will look for gotop.conf, layouts, color schemes, and extensions.
-      --print-keys        Show the keyboard bindings.  
-
-Built-in layouts:
-  default
-  minimal
-  battery
-  kitchensink
-
-Colorschemes:
-  default
-  default-dark (for white background)
-  solarized
-  solarized16-dark
-  solarized16-light
-  monokai
-  vice
-
-Colorschemes and layouts that are not built-in are searched for (in order) in:
-%s
-The first path in this list is always the cwd.
-
-Log files are stored in %s
-
-`, strings.Join(cpaths, ", "), filepath.Join(conf.ConfigDir.QueryCacheFolder().Path, logging.LOGFILE))
-
-	var err error
-	conf.Colorscheme, err = colorschemes.FromName(conf.ConfigDir, "default")
-	if err != nil {
-		return err
-	}
+      --list <devices|layouts|colorschemes|paths|keys>
+        devices: Prints out device names for widgets supporting filters.
+        layouts: Lists build-in layouts
+        colorschemes: Lists built-in colorschemes
+        paths: List out the paths that gotop will look for gotop.conf, layouts, and color schemes.
+        keys: Show the keyboard bindings.  
+      --write-config      Write out a sample config file, either to the home config location, or current directory. Command-line arguments specificed at the same time will overwrite values in the config file.`)
 
 	args, err := docopt.ParseArgs(usage, os.Args[1:], Version)
 	if err != nil {
@@ -127,6 +101,7 @@ Log files are stored in %s
 		}
 		conf.Colorscheme = cs
 	}
+
 	if args["--averagecpu"].(bool) {
 		conf.AverageLoad, _ = args["--averagecpu"].(bool)
 	}
@@ -166,10 +141,6 @@ Log files are stored in %s
 	if val, _ := args["--interface"]; val != nil {
 		conf.NetInterface, _ = args["--interface"].(string)
 	}
-	if val, _ := args["--extensions"]; val != nil {
-		exs, _ := args["--extensions"].(string)
-		conf.Extensions = strings.Split(exs, ",")
-	}
 	if val, _ := args["--test"]; val != nil {
 		conf.Test = val.(bool)
 	}
@@ -189,16 +160,35 @@ Log files are stored in %s
 	if args["--mbps"].(bool) {
 		conf.Mbps = true
 	}
-	if args["--print-paths"].(bool) {
-		paths := make([]string, 0)
-		for _, d := range conf.ConfigDir.QueryFolders(configdir.All) {
-			paths = append(paths, d.Path)
-		}
-		fmt.Println(strings.Join(paths, "\n"))
-		os.Exit(0)
-	}
-	if args["--print-keys"].(bool) {
-		fmt.Println(`
+	if val, _ := args["--list"]; val != nil {
+		switch val {
+		case "layouts":
+			fmt.Println("Built-in layouts:")
+			fmt.Println("\tdefault")
+			fmt.Println("\tminimal")
+			fmt.Println("\tbattery")
+			fmt.Println("\tkitchensink")
+		case "colorschemes":
+			fmt.Println("Built-in colorschemes:")
+			fmt.Println("\tdefault")
+			fmt.Println("\tdefault-dark (for white background)")
+			fmt.Println("\tsolarized")
+			fmt.Println("\tsolarized16-dark")
+			fmt.Println("\tsolarized16-light")
+			fmt.Println("\tmonokai")
+			fmt.Println("\tvice")
+		case "paths":
+			fmt.Println("Loadable colorschemes & layouts, and the config file, are searched for, in order:")
+			paths := make([]string, 0)
+			for _, d := range conf.ConfigDir.QueryFolders(configdir.All) {
+				paths = append(paths, d.Path)
+			}
+			fmt.Println(strings.Join(paths, "\n"))
+			fmt.Printf("\nThe log file is in %s\n", filepath.Join(conf.ConfigDir.QueryCacheFolder().Path, logging.LOGFILE))
+		case "devices":
+			listDevices()
+		case "keys":
+			fmt.Println(`
 Quit: q or <C-c>
 Process navigation:
     k and <Up>: up
@@ -227,6 +217,19 @@ CPU and Mem graph scaling:
     h: scale in
     l: scale out
 ?: toggles keybind help menu`)
+		default:
+			fmt.Printf("Unknown option \"%s\"; try layouts, colorschemes, or devices\n", val)
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+	if args["--write-config"].(bool) {
+		path, err := conf.Write()
+		if err != nil {
+			fmt.Printf("Failed to write configuration file: %s\n", err)
+			os.Exit(1)
+		}
+		fmt.Printf("Config written to %s\n", path)
 		os.Exit(0)
 	}
 
@@ -437,9 +440,11 @@ func makeConfig() gotop.Config {
 		MaxLogSize:           5000000,
 		Layout:               "default",
 	}
+	conf.Colorscheme, _ = colorschemes.FromName(conf.ConfigDir, "default")
 	return conf
 }
 
+// TODO: Add fans
 // TODO: mpd visualizer widget
 func main() {
 	// This is just to make sure gotop returns a useful exit code, but also
@@ -567,3 +572,14 @@ func runTests(conf gotop.Config) int {
 	fmt.Printf("PASS")
 	return 0
 }
+
+func listDevices() {
+	ms := devices.Domains
+	sort.Strings(ms)
+	for _, m := range ms {
+		fmt.Printf("%s:\n", m)
+		for _, d := range devices.Devices(m) {
+			fmt.Printf("\t%s\n", d)
+		}
+	}
+}
diff --git a/colorschemes/registry.go b/colorschemes/registry.go
index b6263c9..d120eb8 100644
--- a/colorschemes/registry.go
+++ b/colorschemes/registry.go
@@ -29,6 +29,7 @@ func register(name string, c Colorscheme) {
 	if registry == nil {
 		registry = make(map[string]Colorscheme)
 	}
+	c.Name = name
 	registry[name] = c
 }
 
diff --git a/config.go b/config.go
index 3d1ae38..7809918 100644
--- a/config.go
+++ b/config.go
@@ -2,10 +2,10 @@ package gotop
 
 import (
 	"bufio"
+	"bytes"
 	"fmt"
-	"io"
 	"log"
-	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -15,7 +15,6 @@ import (
 	"github.com/xxxserxxx/gotop/v3/widgets"
 )
 
-// TODO: test, build, release [#119] [#120] [#121]
 type Config struct {
 	ConfigDir configdir.ConfigDir
 
@@ -32,30 +31,31 @@ type Config struct {
 	Layout         string
 	MaxLogSize     int64
 	ExportPort     string
-	Extensions     []string
 	Mbps           bool
+	Temps          []string
 
 	Test bool
 }
 
 func (conf *Config) Load() error {
-	var in io.Reader
+	var in []byte
+	var err error
 	cfn := "gotop.conf"
 	folder := conf.ConfigDir.QueryFolderContainsFile(cfn)
 	if folder != nil {
-		// FIXME: Shouldn't this be looking in folder??
-		if cf, err := os.Open(cfn); err == nil {
-			defer cf.Close()
-		} else {
+		if in, err = folder.ReadFile(cfn); err != nil {
 			return err
 		}
 	} else {
 		return nil
 	}
-	r := bufio.NewScanner(in)
+	r := bufio.NewScanner(bytes.NewReader(in))
 	var lineNo int
 	for r.Scan() {
 		l := strings.TrimSpace(r.Text())
+		if l[0] == '#' {
+			continue
+		}
 		kv := strings.Split(l, "=")
 		if len(kv) != 2 {
 			return fmt.Errorf("bad config file syntax; should be KEY=VALUE, was %s", l)
@@ -70,72 +70,125 @@ func (conf *Config) Load() error {
 			log.Printf("logdir is deprecated.  Ignored logdir=%s", kv[1])
 		case "logfile":
 			log.Printf("logfile is deprecated.  Ignored logfile=%s", kv[1])
-		case "graphhorizontalscale":
+		case graphhorizontalscale:
 			iv, err := strconv.Atoi(kv[1])
 			if err != nil {
 				return err
 			}
 			conf.GraphHorizontalScale = iv
-		case "helpvisible":
+		case helpvisible:
 			bv, err := strconv.ParseBool(kv[1])
 			if err != nil {
 				return fmt.Errorf("line %d: %v", lineNo, err)
 			}
 			conf.HelpVisible = bv
-		case "colorscheme":
+		case colorscheme:
 			cs, err := colorschemes.FromName(conf.ConfigDir, kv[1])
 			if err != nil {
 				return fmt.Errorf("line %d: %v", lineNo, err)
 			}
 			conf.Colorscheme = cs
-		case "updateinterval":
+		case updateinterval:
 			iv, err := strconv.Atoi(kv[1])
 			if err != nil {
 				return err
 			}
 			conf.UpdateInterval = time.Duration(iv)
-		case "averagecpu":
+		case averagecpu:
 			bv, err := strconv.ParseBool(kv[1])
 			if err != nil {
 				return fmt.Errorf("line %d: %v", lineNo, err)
 			}
 			conf.AverageLoad = bv
-		case "percpuload":
+		case percpuload:
 			bv, err := strconv.ParseBool(kv[1])
 			if err != nil {
 				return fmt.Errorf("line %d: %v", lineNo, err)
 			}
 			conf.PercpuLoad = bv
-		case "tempscale":
+		case tempscale:
 			iv, err := strconv.Atoi(kv[1])
 			if err != nil {
 				return err
 			}
 			conf.TempScale = widgets.TempScale(iv)
-		case "statusbar":
+		case statusbar:
 			bv, err := strconv.ParseBool(kv[1])
 			if err != nil {
 				return fmt.Errorf("line %d: %v", lineNo, err)
 			}
 			conf.Statusbar = bv
-		case "netinterface":
+		case netinterface:
 			conf.NetInterface = kv[1]
-		case "layout":
+		case layout:
 			conf.Layout = kv[1]
-		case "maxlogsize":
+		case maxlogsize:
 			iv, err := strconv.Atoi(kv[1])
 			if err != nil {
 				return err
 			}
 			conf.MaxLogSize = int64(iv)
-		case "export":
+		case export:
 			conf.ExportPort = kv[1]
-		case "extensions":
-			conf.Extensions = strings.Split(kv[1], ",")
-		case "mbps":
+		case mbps:
 			conf.Mbps = true
+		case temperatures:
+			conf.Temps = strings.Split(kv[1], ",")
 		}
 	}
 
 	return nil
 }
+
+func (c *Config) Write() (string, error) {
+	cfn := "gotop.conf"
+	ds := c.ConfigDir.QueryFolders(configdir.Global)
+	if len(ds) == 0 {
+		ds = c.ConfigDir.QueryFolders(configdir.Local)
+		if len(ds) == 0 {
+			return "", fmt.Errorf("error locating config folders")
+		}
+	}
+	marshalled := marshal(c)
+	err := ds[0].WriteFile(cfn, marshalled)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(ds[0].Path, cfn), nil
+}
+
+func marshal(c *Config) []byte {
+	buff := bytes.NewBuffer(nil)
+	fmt.Fprintf(buff, "%s=%d\n", graphhorizontalscale, c.GraphHorizontalScale)
+	fmt.Fprintf(buff, "%s=%t\n", helpvisible, c.HelpVisible)
+	fmt.Fprintf(buff, "%s=%s\n", colorscheme, c.Colorscheme.Name)
+	fmt.Fprintf(buff, "%s=%d\n", updateinterval, c.UpdateInterval)
+	fmt.Fprintf(buff, "%s=%t\n", averagecpu, c.AverageLoad)
+	fmt.Fprintf(buff, "%s=%t\n", percpuload, c.PercpuLoad)
+	fmt.Fprintf(buff, "%s=%d\n", tempscale, c.TempScale)
+	fmt.Fprintf(buff, "%s=%t\n", statusbar, c.Statusbar)
+	fmt.Fprintf(buff, "%s=%s\n", netinterface, c.NetInterface)
+	fmt.Fprintf(buff, "%s=%s\n", layout, c.Layout)
+	fmt.Fprintf(buff, "%s=%d\n", maxlogsize, c.MaxLogSize)
+	fmt.Fprintf(buff, "%s=%s\n", export, c.ExportPort)
+	fmt.Fprintf(buff, "%s=%t\n", mbps, c.Mbps)
+	fmt.Fprintf(buff, "%s=%s\n", temperatures, strings.Join(c.Temps, ","))
+	return buff.Bytes()
+}
+
+const (
+	graphhorizontalscale = "graphhorizontalscale"
+	helpvisible          = "helpvisible"
+	colorscheme          = "colorscheme"
+	updateinterval       = "updateinterval"
+	averagecpu           = "averagecpu"
+	percpuload           = "percpuload"
+	tempscale            = "tempscale"
+	statusbar            = "statusbar"
+	netinterface         = "netinterface"
+	layout               = "layout"
+	maxlogsize           = "maxlogsize"
+	export               = "metricsexportport"
+	mbps                 = "mbps"
+	temperatures         = "temperatures"
+)
diff --git a/devices/devices.go b/devices/devices.go
index 91a8815..efdc404 100644
--- a/devices/devices.go
+++ b/devices/devices.go
@@ -2,7 +2,13 @@ package devices
 
 import "log"
 
+const (
+	Temperatures = "Temperatures"
+)
+
+var Domains []string = []string{Temperatures}
 var shutdownFuncs []func() error
+var _devs map[string][]string
 
 // RegisterShutdown stores a function to be called by gotop on exit, allowing
 // extensions to properly release resources.  Extensions should register a
@@ -24,3 +30,18 @@ func Shutdown() {
 		}
 	}
 }
+
+func RegisterDeviceList(typ string, f func() []string) {
+	if _devs == nil {
+		_devs = make(map[string][]string)
+	}
+	if ls, ok := _devs[typ]; ok {
+		_devs[typ] = append(ls, f()...)
+		return
+	}
+	_devs[typ] = f()
+}
+
+func Devices(domain string) []string {
+	return _devs[domain]
+}
diff --git a/devices/temp_darwin.go b/devices/temp_darwin.go
index 4e068a4..fe98fc2 100644
--- a/devices/temp_darwin.go
+++ b/devices/temp_darwin.go
@@ -6,6 +6,7 @@ import smc "github.com/xxxserxxx/iSMC"
 
 func init() {
 	RegisterTemp(update)
+	RegisterDeviceList(Temperatures, devs)
 	ts = make(map[string]float32)
 }
 
@@ -17,7 +18,19 @@ func update(temps map[string]int) map[string]error {
 		return map[string]error{"temps": err}
 	}
 	for k, v := range ts {
-		temps[k] = int(v + 0.5)
+		if _, ok := temps[k]; ok {
+			temps[k] = int(v + 0.5)
+		}
 	}
 	return nil
 }
+
+// TODO: Set reasonable default devices
+// CPU (TC[01]P), GPU (TG0P), Memory (Ts0S) and Disk (TH0P)
+func devs() []string {
+	rv := make([]string, len(smc.AppleTemp))
+	for i, v := range smc.AppleTemp {
+		rv[i] = v.Desc
+	}
+	return rv
+}
diff --git a/devices/temp_freebsd.go b/devices/temp_freebsd.go
index 54355fc..a0277a6 100644
--- a/devices/temp_freebsd.go
+++ b/devices/temp_freebsd.go
@@ -12,6 +12,7 @@ import (
 
 func init() {
 	RegisterTemp(update)
+	RegisterDeviceList(Temperatures, devs)
 }
 
 var sensorOIDS = map[string]string{
@@ -23,6 +24,9 @@ func update(temps map[string]int) map[string]error {
 	var errors map[string]error
 
 	for k, v := range sensorOIDS {
+		if _, ok := temps[k]; !ok {
+			continue
+		}
 		output, err := exec.Command("sysctl", "-n", k).Output()
 		if err != nil {
 			errors[v] = err
@@ -43,3 +47,11 @@ func update(temps map[string]int) map[string]error {
 
 	return errors
 }
+
+func devs() []string {
+	rv := make([]string, 0, len(sensorOIDS))
+	for k, _ := range sensorOIDS {
+		rv = append(rv, k)
+	}
+	return rv
+}
diff --git a/devices/temp_linux.go b/devices/temp_linux.go
index ec4ff95..2ca01f5 100644
--- a/devices/temp_linux.go
+++ b/devices/temp_linux.go
@@ -10,6 +10,7 @@ import (
 
 func init() {
 	RegisterTemp(getTemps)
+	RegisterDeviceList(Temperatures, devs)
 }
 
 func getTemps(temps map[string]int) map[string]error {
@@ -18,12 +19,31 @@ func getTemps(temps map[string]int) map[string]error {
 		return map[string]error{"psHost": err}
 	}
 	for _, sensor := range sensors {
+		// removes '_input' from the end of the sensor name
+		idx := strings.Index(sensor.SensorKey, "_input")
+		if idx >= 0 {
+			label := sensor.SensorKey[:idx]
+			if _, ok := temps[label]; ok {
+				temps[label] = int(sensor.Temperature)
+			}
+		}
+	}
+	return nil
+}
+
+func devs() []string {
+	sensors, err := psHost.SensorsTemperatures()
+	if err != nil {
+		return []string{}
+	}
+	rv := make([]string, 0, len(sensors))
+	for _, sensor := range sensors {
 		// only sensors with input in their name are giving us live temp info
 		if strings.Contains(sensor.SensorKey, "input") && sensor.Temperature != 0 {
 			// removes '_input' from the end of the sensor name
 			label := sensor.SensorKey[:strings.Index(sensor.SensorKey, "_input")]
-			temps[label] = int(sensor.Temperature)
+			rv = append(rv, label)
 		}
 	}
-	return nil
+	return rv
 }
diff --git a/devices/temp_openbsd.go b/devices/temp_openbsd.go
index 410cc4a..d889d78 100644
--- a/devices/temp_openbsd.go
+++ b/devices/temp_openbsd.go
@@ -15,6 +15,7 @@ import (
 	"unsafe"
 )
 
+// TODO: Add filtering.  Getting the temperature sensor names is non-trivial for OpenBSD, and until I can test it, leave it unimplemented
 func init() {
 	RegisterTemp(update)
 }
@@ -66,7 +67,9 @@ func getTemp(temps map[string]int, mib []C.int, mlen int, snsrdev *C.struct_sens
 			key := C.GoString(&snsrdev.xname[0]) + ".temp" + strconv.Itoa(index)
 			temp := int((snsr.value - 273150000.0) / 1000000.0)
 
-			temps[key] = temp
+			if _, ok := temps[key]; ok {
+				temps[key] = temp
+			}
 		}
 	}
 }
diff --git a/devices/temp_windows.go b/devices/temp_windows.go
index 230e902..54fe0eb 100644
--- a/devices/temp_windows.go
+++ b/devices/temp_windows.go
@@ -8,6 +8,7 @@ import (
 
 func init() {
 	RegisterTemp(update)
+	RegisterDeviceList(Temperatures, devs)
 }
 
 func update(temps map[string]int) map[string]error {
@@ -16,9 +17,23 @@ func update(temps map[string]int) map[string]error {
 		return map[string]error{"gopsutil": err}
 	}
 	for _, sensor := range sensors {
-		if sensor.Temperature != 0 {
-			temps[sensor.SensorKey] = int(sensor.Temperature)
+		if _, ok := temps[sensor.SensorKey]; ok {
+			temps[sensor.SensorKey] = int(sensor.Temperature + 0.5)
 		}
 	}
 	return nil
 }
+
+func devs() []string {
+	sensors, err := psHost.SensorsTemperatures()
+	if err != nil {
+		return []string{}
+	}
+	rv := make([]string, 0, len(sensors))
+	for _, sensor := range sensors {
+		if sensor.Temperature != 0 {
+			rv = append(rv, sensor.SensorKey)
+		}
+	}
+	return rv
+}
diff --git a/layout/layout.go b/layout/layout.go
index c59e718..6fb7c58 100644
--- a/layout/layout.go
+++ b/layout/layout.go
@@ -177,7 +177,7 @@ func makeWidget(c gotop.Config, widRule widgetRule) interface{} {
 		assignColors(b.Data, c.Colorscheme.BattLines, b.LineColors)
 		w = b
 	case "temp":
-		t := widgets.NewTempWidget(c.TempScale)
+		t := widgets.NewTempWidget(c.TempScale, c.Temps)
 		t.TempLowColor = ui.Color(c.Colorscheme.TempLow)
 		t.TempHighColor = ui.Color(c.Colorscheme.TempHigh)
 		w = t
diff --git a/widgets/disk.go b/widgets/disk.go
index b53df9d..e2b3eb2 100644
--- a/widgets/disk.go
+++ b/widgets/disk.go
@@ -32,6 +32,8 @@ type DiskWidget struct {
 	metric         map[string]prometheus.Gauge
 }
 
+// TODO: Add filtering
+// TODO: Abstract out device from widget
 func NewDiskWidget() *DiskWidget {
 	self := &DiskWidget{
 		Table:          ui.NewTable(),
diff --git a/widgets/temp.go b/widgets/temp.go
index 1b9f650..3e1b067 100644
--- a/widgets/temp.go
+++ b/widgets/temp.go
@@ -32,7 +32,7 @@ type TempWidget struct {
 }
 
 // TODO: state:deferred 156 Added temperatures for NVidia GPUs (azak-azkaran/master). Crashes on non-nvidia machines.
-func NewTempWidget(tempScale TempScale) *TempWidget {
+func NewTempWidget(tempScale TempScale, filter []string) *TempWidget {
 	self := &TempWidget{
 		Block:          ui.NewBlock(),
 		updateInterval: time.Second * 5,
@@ -41,6 +41,15 @@ func NewTempWidget(tempScale TempScale) *TempWidget {
 		TempScale:      tempScale,
 	}
 	self.Title = " Temperatures "
+	if len(filter) > 0 {
+		for _, t := range filter {
+			self.Data[t] = 0
+		}
+	} else {
+		for _, t := range devices.Devices(devices.Temperatures) {
+			self.Data[t] = 0
+		}
+	}
 
 	if tempScale == Fahrenheit {
 		self.TempThreshold = utils.CelsiusToFahrenheit(self.TempThreshold)