yambar: add niri workspace indicator on the left

Show workspace numbers on the left of the bar, highlighting the focused
one. A new niri-workspaces.sh script feeds the focused output's workspace
state to yambar's script module (one ws1..ws9 tag per slot: focused /
active / exists / none), re-rendering on niri workspace events. Each
number is clickable to focus that workspace.

Requires jq + niri on the yambar service PATH (added in nixos-config).

Assisted-by: Claude Code:claude-opus-4-8

2 files changed, 101 insertions, 0 deletions

diff --git a/yambar/.config/yambar/config.yml b/yambar/.config/yambar/config.yml
index f17ec83..aec9fb0 100644
--- a/yambar/.config/yambar/config.yml
+++ b/yambar/.config/yambar/config.yml
@@ -12,6 +12,77 @@ bar:
   border:
     top-margin: 0
 
+  left:
+  - script:
+      path: ~/.config/yambar/niri-workspaces.sh
+      content:
+        list:
+          spacing: 10
+          items:
+          - map:
+              on-click: niri msg action focus-workspace 1
+              default: {empty: {}}
+              conditions:
+                ws1 == "focused": {string: {text: "1", foreground: 50fa7bff}}
+                ws1 == "active":  {string: {text: "1", foreground: f1fa8cff}}
+                ws1 == "exists":  {string: {text: "1", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 2
+              default: {empty: {}}
+              conditions:
+                ws2 == "focused": {string: {text: "2", foreground: 50fa7bff}}
+                ws2 == "active":  {string: {text: "2", foreground: f1fa8cff}}
+                ws2 == "exists":  {string: {text: "2", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 3
+              default: {empty: {}}
+              conditions:
+                ws3 == "focused": {string: {text: "3", foreground: 50fa7bff}}
+                ws3 == "active":  {string: {text: "3", foreground: f1fa8cff}}
+                ws3 == "exists":  {string: {text: "3", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 4
+              default: {empty: {}}
+              conditions:
+                ws4 == "focused": {string: {text: "4", foreground: 50fa7bff}}
+                ws4 == "active":  {string: {text: "4", foreground: f1fa8cff}}
+                ws4 == "exists":  {string: {text: "4", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 5
+              default: {empty: {}}
+              conditions:
+                ws5 == "focused": {string: {text: "5", foreground: 50fa7bff}}
+                ws5 == "active":  {string: {text: "5", foreground: f1fa8cff}}
+                ws5 == "exists":  {string: {text: "5", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 6
+              default: {empty: {}}
+              conditions:
+                ws6 == "focused": {string: {text: "6", foreground: 50fa7bff}}
+                ws6 == "active":  {string: {text: "6", foreground: f1fa8cff}}
+                ws6 == "exists":  {string: {text: "6", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 7
+              default: {empty: {}}
+              conditions:
+                ws7 == "focused": {string: {text: "7", foreground: 50fa7bff}}
+                ws7 == "active":  {string: {text: "7", foreground: f1fa8cff}}
+                ws7 == "exists":  {string: {text: "7", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 8
+              default: {empty: {}}
+              conditions:
+                ws8 == "focused": {string: {text: "8", foreground: 50fa7bff}}
+                ws8 == "active":  {string: {text: "8", foreground: f1fa8cff}}
+                ws8 == "exists":  {string: {text: "8", foreground: 6272a4ff}}
+          - map:
+              on-click: niri msg action focus-workspace 9
+              default: {empty: {}}
+              conditions:
+                ws9 == "focused": {string: {text: "9", foreground: 50fa7bff}}
+                ws9 == "active":  {string: {text: "9", foreground: f1fa8cff}}
+                ws9 == "exists":  {string: {text: "9", foreground: 6272a4ff}}
+
   right:
   - network:
       poll-interval: 30000
diff --git a/yambar/.config/yambar/niri-workspaces.sh b/yambar/.config/yambar/niri-workspaces.sh
new file mode 100755
index 0000000..5527ada
--- /dev/null
+++ b/yambar/.config/yambar/niri-workspaces.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+# Feed niri workspace state to yambar's script module.
+#
+# Emits one string tag per workspace slot (ws1..ws9) for the currently
+# focused output, with values: focused / active / exists / none.
+# Re-renders whenever niri reports a workspace change.
+
+emit() {
+    niri msg --json workspaces | jq -r '
+        (first(.[] | select(.is_focused)).output) as $fout
+        | ( reduce (.[] | select(.output == $fout)) as $w ({};
+              .[$w.idx | tostring] =
+                (if   $w.is_focused then "focused"
+                 elif $w.is_active  then "active"
+                 else                    "exists" end)) ) as $st
+        | ( [range(1; 10) | "ws\(.)|string|" + ($st[(. | tostring)] // "none")]
+            | join("\n") ) + "\n"
+    '
+    # blank line commits the update to yambar
+    echo
+}
+
+emit
+niri msg --json event-stream | while read -r line; do
+    case "$line" in
+        *WorkspacesChanged*|*WorkspaceActivated*|*WorkspaceUrgencyChanged*)
+            emit
+            ;;
+    esac
+done