adding support for if\else type situations

README.md

@@ -15,6 +15,7 @@ No Elgato software required — communicates directly with the device over USB H
 - PNG and JPEG icons, automatically scaled to key size
 - Animated GIF support — frames pre-encoded at startup, cycled at the GIF's native rate
 - Runs any shell command on key press
+- **Status/toggle keys** — poll any shell command on an interval, swap icons based on output; icon updates on press
 - **Live config reload** — save your config and the deck updates instantly, no restart needed
 - Privileged command helper — run whitelisted root commands via a Unix socket; supports polkit auth dialogs
 - Automatic reconnect — survives USB unplug, KVM switches, and suspend/resume
@@ -60,6 +61,10 @@ streamdeck-go/
               │                        └──▶ goroutine/key: loop frames, sleep per-frame delay
               │                             (cancelled via ctx on reload)
               │
+              ├── poll goroutine/key ──▶ exec poll command every interval
+              │                            └──▶ match in stdout? swap icon_true / icon_false
+              │                                 (also triggered immediately on button press)
+              │
               └── event loop ──▶ device.ReadButtons()    (250 ms timeout, checks ctx)
                                       └──▶ key-down: exec.Command("sh", "-c", command)
 ```
@@ -272,6 +277,63 @@ keys:
     command: ""
 ```
 
+### Status / toggle keys
+
+A key can poll any shell command on an interval and show one of two icons based on the result. Pressing the button runs `command` as usual, and the icon re-checks ~400 ms later so it reflects the new state immediately.
+
+```yaml
+keys:
+  3:
+    command: pactl set-source-mute @DEFAULT_SOURCE@ toggle
+    icon_true:  mic-muted.png   # shown when poll output contains match
+    icon_false: mic-active.png  # shown when poll output does not contain match
+    poll:
+      command:  pactl get-source-mute @DEFAULT_SOURCE@
+      interval: 2s              # how often to check (default: 2s)
+      match: "yes"              # substring to find in stdout → true
+```
+
+**How matching works:**
+
+| `match` set? | True condition | False condition |
+|---|---|---|
+| Yes | stdout contains the string | stdout does not contain it |
+| No (omitted) | command exits 0 | command exits non-zero |
+
+**More examples:**
+
+```yaml
+# VPN status (exit-code match — no match string needed)
+4:
+  command: nmcli connection up my-vpn
+  icon_true:  vpn-on.png
+  icon_false: vpn-off.png
+  poll:
+    command: nmcli connection show --active my-vpn
+    interval: 5s
+
+# Systemd service toggle
+5:
+  command: systemctl --user toggle my-service
+  icon_true:  service-running.png
+  icon_false: service-stopped.png
+  poll:
+    command:  systemctl --user is-active my-service
+    interval: 3s
+
+# Speaker mute
+6:
+  command: pactl set-sink-mute @DEFAULT_SINK@ toggle
+  icon_true:  speaker-muted.png
+  icon_false: speaker-on.png
+  poll:
+    command:  pactl get-sink-mute @DEFAULT_SINK@
+    interval: 2s
+    match: "yes"
+```
+
+---
+
 ### Terminal & SSH commands
 
 Any shell command works — including launching terminals and SSH sessions.
@@ -358,6 +420,7 @@ Works as long as SSH key auth is set up and the key has no passphrase (or the ag
 | PNG | Recommended for static icons |
 | JPEG | Good for photos / complex images |
 | GIF | Animated — all frames pre-encoded at startup, cycled in a background goroutine |
+| SVG | Rasterised to 96×96 at startup via `oksvg` |
 
 Icons are scaled to 96×96 px using bi-linear filtering. The XL renders images
 mirrored, so they are pre-flipped before sending — your icons will appear the right

config.example.yaml

@@ -19,6 +19,7 @@ device:
 # command: any shell command
 
 keys:
+  # Regular key: show an icon and run a command on press.
   0:
     icon: ghostty.png
     command: ghostty
@@ -28,3 +29,35 @@ keys:
   2:
     icon: files.png
     command: nautilus
+
+  # Toggle/status key: polls a command to determine state and shows one of two
+  # icons. Pressing the button runs `command` and the icon updates automatically.
+  #
+  # `match` is a substring to find in the poll command's stdout.
+  # If match is found → icon_on is shown; otherwise → icon_off.
+  # Omit `match` entirely to use exit code instead (0 = on, non-zero = off).
+  #
+  # Examples:
+  #   Microphone mute:
+  #     command: pactl set-source-mute @DEFAULT_SOURCE@ toggle
+  #     poll.command: pactl get-source-mute @DEFAULT_SOURCE@
+  #     poll.match: "yes"   # "Mute: yes" → muted → show icon_on (mic-muted.png)
+  #
+  #   VPN toggle:
+  #     command: nmcli connection up my-vpn / nmcli connection down my-vpn
+  #     poll.command: nmcli connection show --active my-vpn
+  #     (no match — uses exit code: 0 = connected)
+  #
+  #   Systemd service:
+  #     command: systemctl --user toggle my-service
+  #     poll.command: systemctl --user is-active my-service
+  #     (no match — uses exit code)
+  #
+  # 3:
+  #   command: pactl set-source-mute @DEFAULT_SOURCE@ toggle
+  #   icon_true: mic-muted.png
+  #   icon_false: mic-active.png
+  #   poll:
+  #     command: pactl get-source-mute @DEFAULT_SOURCE@
+  #     interval: 2s
+  #     match: "yes"

go.mod

@@ -9,4 +9,10 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
-require golang.org/x/sys v0.13.0 // indirect
+require (
+	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c // indirect
+	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
+	golang.org/x/net v0.0.0-20211118161319-6a13c67c3ce4 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.35.0 // indirect
+)

go.sum

@@ -1,11 +1,19 @@
 github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c h1:km8GpoQut05eY3GiYWEedbTT0qnSxrCjsVbb7yKY1KE=
+github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c/go.mod h1:cNQ3dwVJtS5Hmnjxy6AgTPd0Inb3pW05ftPSX7NZO7Q=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef h1:Ch6Q+AZUxDBCVqdkI8FSpFyZDtCVBc2VmejdNrm5rRQ=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef/go.mod h1:nXTWP6+gD5+LUJ8krVhhoeHjvHTutPxMYl5SvkcnJNE=
 github.com/sstallion/go-hid v0.15.0 h1:WERW/VW3Us6N73V2qa7HjdqWQvwHd0CoRDOP/N707/w=
 github.com/sstallion/go-hid v0.15.0/go.mod h1:fPKp4rqx0xuoTV94gwKojsPG++KNKhxuU88goGuGM7I=
 golang.org/x/image v0.37.0 h1:ZiRjArKI8GwxZOoEtUfhrBtaCN+4b/7709dlT6SSnQA=
 golang.org/x/image v0.37.0/go.mod h1:/3f6vaXC+6CEanU4KJxbcUZyEePbyKbaLoDOe4ehFYY=
+golang.org/x/net v0.0.0-20211118161319-6a13c67c3ce4 h1:DZshvxDdVoeKIbudAdFEKi+f70l51luSy/7b76ibTY0=
+golang.org/x/net v0.0.0-20211118161319-6a13c67c3ce4/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
+golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

internal/config/config.go

@@ -8,10 +8,22 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+// PollConfig defines how to poll for the current state of a toggle key.
+type PollConfig struct {
+	Command  string `yaml:"command"`  // shell command whose output is checked
+	Interval string `yaml:"interval"` // how often to poll, e.g. "2s" (default: "2s")
+	Match    string `yaml:"match"`    // substring to find in output → "on" state; omit to use exit code 0
+}
+
 // KeyConfig defines what a single Stream Deck key does.
 type KeyConfig struct {
-	Icon    string `yaml:"icon"`    // filename relative to icons_dir
+	Icon    string `yaml:"icon"`    // filename relative to icons_dir (regular keys)
 	Command string `yaml:"command"` // shell command to run on press
+
+	// Toggle/status keys: show different icons based on polled state.
+	IconTrue  string      `yaml:"icon_true"`  // icon when poll match is true
+	IconFalse string      `yaml:"icon_false"` // icon when poll match is false
+	Poll      *PollConfig `yaml:"poll"`
 }
 
 // Config is the top-level structure of the YAML config file.