settings: the assistant's daemon config, tools, and Ask presets

Two settings pages for desktop-assistant.

Assistant edits the daemon's config.toml: server, temperature, tool
rounds, thinking, the system prompt, and the [env] values its tools
read; a switch per tool renames tools/<name>.toml to .toml.off, which
the daemon's glob skips. The daemon reads all of it at startup only, so
the page says when a change is pending and Restart runs assistant.sh
restart, showing its status when the daemon does not come back.

The file is edited line by line, like autostart.lua, so the comments
the example ships with survive: unset keys stay commented out in place.
Every write parses the whole new file with tomllib first and replaces
the old one atomically, so no edit can leave a config the daemon will
not start with. Defaults are read from assistant.py --defaults rather
than copied into QML.

Ask presets edits the canvas's canned questions, which Prefs already
stored for exactly this page: label, question, and the kinds each is
offered for. They apply live.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/desktop/modules/assistant/Config.js b/desktop/modules/assistant/Config.js
new file mode 100644
index 0000000..c30ea8b
--- /dev/null
+++ b/desktop/modules/assistant/Config.js
@@ -0,0 +1,142 @@
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+.pragma library
+
+// Pure helpers for desktop-assistant's config.toml, tested by
+// test_config.js under node.
+//
+// The file is edited line by line so its comments survive: the example it
+// is copied from documents every key in place. Only the shapes this page
+// writes are understood: top-level `key = value` before the first table,
+// and `KEY = "value"` lines in [env]. A top-level key that is unset sits
+// commented out (`# key = value`), which is how the example ships, so
+// setting one activates its line and unsetting comments it back out.
+// ponytail: no multi-line strings or arrays; the page never writes one,
+// and Save validates the whole file with tomllib before writing.
+
+const KEY = /^(\s*)(#\s*)?([A-Za-z_][A-Za-z0-9_]*)\s*=\s*(.*)$/;
+const HEADER = /^\s*\[/;
+
+function quote(s) {
+    return '"' + String(s).replace(/[\\"]/g, c => "\\" + c)
+        .replace(/\n/g, "\\n").replace(/\t/g, "\\t").replace(/\r/g, "\\r") + '"';
+}
+
+// The value at the start of rest and where it ends, so what follows (an
+// inline comment) can be kept.
+function value(rest) {
+    if (rest.startsWith('"')) {
+        let out = "";
+        for (let i = 1; i < rest.length; i++) {
+            const c = rest[i];
+            if (c === '"') return { v: out, end: i + 1 };
+            if (c === "\\" && i + 1 < rest.length) {
+                const n = rest[++i];
+                out += n === "n" ? "\n" : n === "t" ? "\t" : n === "r" ? "\r" : n;
+            } else out += c;
+        }
+        return { v: out, end: rest.length };
+    }
+    const m = /^[^\s#]*/.exec(rest)[0];
+    const v = m === "true" ? true : m === "false" ? false
+            : m !== "" && !isNaN(Number(m)) ? Number(m) : m;
+    return { v: v, end: m.length };
+}
+
+function firstHeader(lines) {
+    const i = lines.findIndex(l => HEADER.test(l) && !/^\s*#/.test(l));
+    return i < 0 ? lines.length : i;
+}
+
+// {key: value} for the active top-level keys among keys.
+function scalars(text, keys) {
+    const lines = text.split("\n");
+    const out = {};
+    for (let i = 0; i < firstHeader(lines); i++) {
+        const m = KEY.exec(lines[i]);
+        if (m && !m[2] && keys.includes(m[3])) out[m[3]] = value(m[4]).v;
+    }
+    return out;
+}
+
+// toml is the value already written as TOML (quote() for a string), or null
+// to unset.
+function setScalar(text, key, toml) {
+    const lines = text.split("\n");
+    const end = firstHeader(lines);
+    let commented = -1;
+    for (let i = 0; i < end; i++) {
+        const m = KEY.exec(lines[i]);
+        if (!m || m[3] !== key) continue;
+        if (!m[2]) {
+            const tail = m[4].slice(value(m[4]).end);
+            lines[i] = toml === null ? m[1] + "# " + key + " = " + m[4]
+                                     : m[1] + key + " = " + toml + tail;
+            return lines.join("\n");
+        }
+        if (commented < 0) commented = i;
+    }
+    if (toml === null) return text;
+    if (commented >= 0) {
+        const m = KEY.exec(lines[commented]);
+        lines[commented] = m[1] + key + " = " + toml + m[4].slice(value(m[4]).end);
+    } else {
+        // Before the blank line that separates the first table, if any.
+        const at = end > 0 && lines[end - 1].trim() === "" ? end - 1 : end;
+        lines.splice(at, 0, key + " = " + toml);
+    }
+    return lines.join("\n");
+}
+
+function envRange(lines) {
+    const h = lines.findIndex(l => /^\s*\[env\]\s*(#.*)?$/.test(l));
+    if (h < 0) return null;
+    let e = lines.findIndex((l, i) => i > h && HEADER.test(l));
+    return { h: h, end: e < 0 ? lines.length : e };
+}
+
+// [{key, value}] for the active lines of [env], in file order.
+function env(text) {
+    const lines = text.split("\n");
+    const r = envRange(lines);
+    if (!r) return [];
+    const out = [];
+    for (let i = r.h + 1; i < r.end; i++) {
+        const m = KEY.exec(lines[i]);
+        if (m && !m[2]) out.push({ key: m[3], value: String(value(m[4]).v) });
+    }
+    return out;
+}
+
+// value is a plain string, quoted here; null removes the key.
+function setEnv(text, key, val) {
+    const lines = text.split("\n");
+    const r = envRange(lines);
+    if (!r) {
+        if (val === null) return text;
+        return text.replace(/\n*$/, "") + "\n\n[env]\n" + key + " = " + quote(val) + "\n";
+    }
+    let last = r.h;
+    for (let i = r.h + 1; i < r.end; i++) {
+        const m = KEY.exec(lines[i]);
+        if (!m || m[2]) continue;
+        if (m[3] === key) {
+            if (val === null) lines.splice(i, 1);
+            else lines[i] = m[1] + key + " = " + quote(val) + m[4].slice(value(m[4]).end);
+            return lines.join("\n");
+        }
+        last = i;
+    }
+    if (val === null) return text;
+    lines.splice(last + 1, 0, key + " = " + quote(val));
+    return lines.join("\n");
+}