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diff --git a/LICENSE.md b/LICENSE.md
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+Copyright (c) 2026 Clément Sibille
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
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+# Listimer
+
+Simple timer meant to be displayed in a sway-bar status.
+
+## Usage
+
+Start the timer with the `start` subcommand.
+
+```sh
+$ listimer start <number of minutes>
+```
+
+Restart the timer with the `restart` subcommand.
+
+```sh
+$ listimer restart
+```
+
+Stop the timer with the `stop` subcommand.
+
+```sh
+$ listimer stop
+```
+
+Query the timer with the `query` subcommand.
+
+```sh
+$ listimer query
+```
+
+The command will output [pango
+markup](https://docs.gtk.org/Pango/pango_markup.html). To use it with sway-bar
+be sure to enable the `pango_markup` sway-bar option.
diff --git a/listimer b/listimer
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+#!/bin/sh
+
+COMMAND=$1
+case "$COMMAND"
+in
+  "start")
+    if [ "$#" -ne 2 ]; then
+        echo "Usage: listimer start <minutes>";
+        exit 1;
+    fi
+    DURATION_MIN=$2
+    CURRENT_TIME=$(date +%s)
+    echo "$CURRENT_TIME\n\n$DURATION_MIN" > /tmp/listimer
+  ;;
+
+  "restart")
+    if [ "$#" -ne 1 ]; then
+        echo "Usage: listimer restart";
+        exit 1;
+    fi
+    CURRENT_TIME=$(date +%s)
+    sed -i "1s/.*/$CURRENT_TIME/" /tmp/listimer
+  ;;
+
+  "stop")
+    if [ "$#" -ne 1 ]; then
+        echo "Usage: listimer stop";
+        exit 1;
+    fi
+    CURRENT_TIME=$(date +%s)
+    rm /tmp/listimer
+  ;;
+
+  "query")
+    if [ ! -f /tmp/listimer ]; then
+      echo "No timer"
+      exit 0;
+    fi
+
+    START_TIME=$(sed -n '1p' < /tmp/listimer)
+    DURATION_MIN=$(sed -n '3p' < /tmp/listimer)
+    DURATION_SEC=$DURATION_MIN*60
+    CURRENT_TIME=$(date +%s)
+
+    ELAPSED_TIME_SEC=$(($CURRENT_TIME-$START_TIME))
+    ELAPSED_TIME_MIN=$(($ELAPSED_TIME_SEC/60))
+    REMAINING_TIME_MIN=$(($DURATION_MIN-$ELAPSED_TIME_MIN))
+
+    if [ "$REMAINING_TIME_MIN" -lt "$(($DURATION_MIN / 2))" ]; then
+      echo "<span weight=\"bold\" size=\"larger\" background=\"#FF0000\">$REMAINING_TIME_MIN minutes</span>" 
+    elif [ "$REMAINING_TIME_MIN" -lt "0" ]; then
+      echo "TIME OUT!"
+    else
+      echo "$REMAINING_TIME_MIN minutes" 
+    fi
+  ;;
+  *) echo "Unexpected command."
+esac