Support multiple named presets (save, list, load, delete)

Presets are now individual TOML files under
~/.config/article-cover-art-generator/presets/ (override with ACAG_PRESETS_DIR).
The panel gets a Presets section: a name field, a combo of saved presets, and
Save/Load/Delete buttons. Replaces the previous single-slot preset.

Author: skvggor

README.md

@@ -44,7 +44,7 @@ the sumi-ê palette) with [skvggor.dev](https://skvggor.dev) and
 - **Live preview** — every control updates the square preview instantly
 - **Adjustable film grain** and **pattern strength** sliders, shown live in the preview
 - **Omakase button** — randomizes the visual style and lets the house plate it for you
-- **Presets** — save/load the current look as TOML (`~/.config/article-cover-art-generator/`)
+- **Named presets** — save any number of looks as TOML and load/delete any of them (`~/.config/article-cover-art-generator/presets/`)
 - **WCAG AAA** — all readable text is forced to ≥ 7:1 contrast against its background
 - **Montserrat** Black / Bold / Regular, embedded in the binary (no system fonts needed)
 - **Export** — **2160² (2K)** or **4096² (4K)** PNG plus the resolution-independent source SVG,
@@ -84,7 +84,7 @@ It will then show up in the app launcher (walker/rofi). Run it from a terminal w
 1. Type a **title** (the only required field).
 2. Fill in optional **category / date / number / brand**.
 3. Pick a **theme**, **pattern** and **layout**; tune the **pattern strength** and **film grain** sliders.
-4. Hit **Omakase** to shuffle the style, or set it by hand; **Save / Load preset** to keep a look.
+4. Hit **Omakase** to shuffle the style, or set it by hand; name and **Save** a preset, then **Load** or **Delete** any saved one.
 5. Choose **2K or 4K**, then **Export PNG** or **Export SVG** (enable *Open after export* to view it).
 
 ## How it works

docs/screenshot.png

@@ -36,7 +36,7 @@ pub fn output_dir() -> PathBuf {
         .join("article-covers")
 }
 
-fn slug(title: &str) -> String {
+pub(crate) fn slug(title: &str) -> String {
     let mut out = String::new();
     let mut pending_dash = false;
     for ch in title.chars() {

src/export.rs

@@ -5,7 +5,7 @@ use std::time::Duration;
 
 use anyhow::Result;
 use slint::{
-    Image, ModelRc, Rgba8Pixel, SharedPixelBuffer, SharedString, Timer, TimerMode, VecModel,
+    Image, Model, ModelRc, Rgba8Pixel, SharedPixelBuffer, SharedString, Timer, TimerMode, VecModel,
 };
 
 use article_cover_art_generator::cover::config::CoverConfig;
@@ -89,6 +89,11 @@ fn string_model(items: Vec<&str>) -> ModelRc<SharedString> {
     .into()
 }
 
+fn reload_presets(model: &VecModel<SharedString>) {
+    let names: Vec<SharedString> = preset::list().into_iter().map(SharedString::from).collect();
+    model.set_vec(names);
+}
+
 fn main() -> Result<()> {
     let ui = AppWindow::new()?;
 
@@ -103,6 +108,10 @@ fn main() -> Result<()> {
     ));
     ui.set_sizes(string_model(vec!["2160 · 2K", "4096 · 4K"]));
 
+    let presets = Rc::new(VecModel::<SharedString>::default());
+    ui.set_presets(presets.clone().into());
+    reload_presets(&presets);
+
     apply_config(&ui, &CoverConfig::default());
     ui.set_size_index(1); // 4K by default
     ui.set_open_after(true);
@@ -184,11 +193,23 @@ fn main() -> Result<()> {
 
     ui.on_save_preset({
         let handle = ui.as_weak();
+        let presets = presets.clone();
         move || {
             if let Some(ui) = handle.upgrade() {
-                let path = preset::default_path();
-                let status = match preset::save(&config_from_ui(&ui), &path) {
-                    Ok(()) => format!("Saved preset → {}", path.display()),
+                let typed = ui.get_preset_name().to_string();
+                let name = if typed.trim().is_empty() {
+                    ui.get_title_text().to_string()
+                } else {
+                    typed
+                };
+                let status = match preset::save(&name, &config_from_ui(&ui)) {
+                    Ok(stored) => {
+                        reload_presets(&presets);
+                        if let Some(index) = preset::list().iter().position(|n| n == &stored) {
+                            ui.set_preset_index(index as i32);
+                        }
+                        format!("Saved preset \"{stored}\"")
+                    }
                     Err(error) => format!("Save preset failed: {error}"),
                 };
                 ui.set_status(status.into());
@@ -198,21 +219,48 @@ fn main() -> Result<()> {
 
     ui.on_load_preset({
         let handle = ui.as_weak();
+        let presets = presets.clone();
         move || {
             if let Some(ui) = handle.upgrade() {
-                let path = preset::default_path();
-                match preset::load(&path) {
+                let index = ui.get_preset_index().max(0) as usize;
+                let Some(name) = presets.row_data(index) else {
+                    ui.set_status("Select a saved preset first".into());
+                    return;
+                };
+                match preset::load(name.as_str()) {
                     Ok(config) => {
                         apply_config(&ui, &config);
                         refresh_preview(&ui);
-                        ui.set_status(format!("Loaded preset ← {}", path.display()).into());
+                        ui.set_status(format!("Loaded preset \"{name}\"").into());
                     }
                     Err(error) => ui.set_status(format!("Load preset failed: {error}").into()),
                 }
             }
         }
     });
 
+    ui.on_delete_preset({
+        let handle = ui.as_weak();
+        let presets = presets.clone();
+        move || {
+            if let Some(ui) = handle.upgrade() {
+                let index = ui.get_preset_index().max(0) as usize;
+                let Some(name) = presets.row_data(index) else {
+                    return;
+                };
+                let status = match preset::delete(name.as_str()) {
+                    Ok(()) => {
+                        reload_presets(&presets);
+                        ui.set_preset_index(0);
+                        format!("Deleted preset \"{name}\"")
+                    }
+                    Err(error) => format!("Delete preset failed: {error}"),
+                };
+                ui.set_status(status.into());
+            }
+        }
+    });
+
     refresh_preview(&ui);
     ui.run()?;
     Ok(())

src/main.rs

@@ -1,90 +1,145 @@
-//! Save and load a cover preset as TOML, to reuse a look across articles.
+//! Named presets: save the current look under a name and load any saved one
+//! later. Each preset is a TOML file in the presets directory
+//! (`~/.config/article-cover-art-generator/presets/`, override with
+//! `ACAG_PRESETS_DIR`).
 
 use std::path::{Path, PathBuf};
 
 use anyhow::{Context, Result};
 
 use crate::cover::CoverConfig;
+use crate::export::slug;
 
-/// Default preset location: `~/.config/article-cover-art-generator/preset.toml`.
-pub fn default_path() -> PathBuf {
+/// Directory holding the preset files.
+pub fn presets_dir() -> PathBuf {
+    if let Some(custom) = std::env::var_os("ACAG_PRESETS_DIR") {
+        return PathBuf::from(custom);
+    }
     dirs::config_dir()
         .unwrap_or_else(|| PathBuf::from("."))
         .join("article-cover-art-generator")
-        .join("preset.toml")
+        .join("presets")
 }
 
-pub fn save(config: &CoverConfig, path: &Path) -> Result<()> {
-    if let Some(parent) = path.parent() {
-        std::fs::create_dir_all(parent)
-            .with_context(|| format!("creating {}", parent.display()))?;
-    }
+fn list_in(dir: &Path) -> Vec<String> {
+    let mut names: Vec<String> = match std::fs::read_dir(dir) {
+        Ok(entries) => entries
+            .flatten()
+            .filter(|entry| entry.path().extension().is_some_and(|ext| ext == "toml"))
+            .filter_map(|entry| {
+                entry
+                    .path()
+                    .file_stem()
+                    .and_then(|stem| stem.to_str())
+                    .map(str::to_owned)
+            })
+            .collect(),
+        Err(_) => Vec::new(),
+    };
+    names.sort();
+    names
+}
+
+fn save_in(dir: &Path, name: &str, config: &CoverConfig) -> Result<String> {
+    std::fs::create_dir_all(dir).with_context(|| format!("creating {}", dir.display()))?;
+    let stem = slug(name);
+    let path = dir.join(format!("{stem}.toml"));
     let toml = toml::to_string_pretty(config).context("serializing preset")?;
-    std::fs::write(path, toml).with_context(|| format!("writing {}", path.display()))?;
-    Ok(())
+    std::fs::write(&path, toml).with_context(|| format!("writing {}", path.display()))?;
+    Ok(stem)
 }
 
-pub fn load(path: &Path) -> Result<CoverConfig> {
+fn load_in(dir: &Path, name: &str) -> Result<CoverConfig> {
+    let path = dir.join(format!("{name}.toml"));
     let toml =
-        std::fs::read_to_string(path).with_context(|| format!("reading {}", path.display()))?;
+        std::fs::read_to_string(&path).with_context(|| format!("reading {}", path.display()))?;
     toml::from_str(&toml).context("parsing preset")
 }
 
+fn delete_in(dir: &Path, name: &str) -> Result<()> {
+    let path = dir.join(format!("{name}.toml"));
+    std::fs::remove_file(&path).with_context(|| format!("removing {}", path.display()))?;
+    Ok(())
+}
+
+/// Names of all saved presets, sorted.
+pub fn list() -> Vec<String> {
+    list_in(&presets_dir())
+}
+
+/// Save `config` under `name`; returns the stored (slugged) name.
+pub fn save(name: &str, config: &CoverConfig) -> Result<String> {
+    save_in(&presets_dir(), name, config)
+}
+
+/// Load the preset stored under `name`.
+pub fn load(name: &str) -> Result<CoverConfig> {
+    load_in(&presets_dir(), name)
+}
+
+/// Delete the preset stored under `name`.
+pub fn delete(name: &str) -> Result<()> {
+    delete_in(&presets_dir(), name)
+}
+
 #[cfg(test)]
 mod tests {
     #![allow(clippy::field_reassign_with_default)]
     use super::*;
     use crate::design::themes::ThemeName;
 
+    fn temp_dir(tag: &str) -> PathBuf {
+        std::env::temp_dir().join(format!("acag-presets-{tag}-{}", std::process::id()))
+    }
+
     #[test]
-    fn roundtrips_through_toml() {
+    fn save_list_load_and_delete_roundtrip() {
+        let dir = temp_dir("roundtrip");
+        std::fs::remove_dir_all(&dir).ok();
+
+        assert!(list_in(&dir).is_empty());
+
         let mut config = CoverConfig::default();
         config.theme = ThemeName::Ai;
-        config.grain = 0.3;
-        config.title = "Reusable look".to_owned();
-        let toml = toml::to_string_pretty(&config).unwrap();
-        let back: CoverConfig = toml::from_str(&toml).unwrap();
-        assert_eq!(back.theme, ThemeName::Ai);
-        assert_eq!(back.title, "Reusable look");
-        assert!((back.grain - 0.3).abs() < 1e-9);
-    }
+        let stored = save_in(&dir, "My LinkedIn Look!", &config).unwrap();
+        assert_eq!(stored, "my-linkedin-look");
 
-    #[test]
-    fn saves_and_loads_a_file() {
-        let path = std::env::temp_dir().join(format!("acag-preset-{}.toml", std::process::id()));
-        let config = CoverConfig::default();
-        save(&config, &path).unwrap();
-        let loaded = load(&path).unwrap();
-        assert_eq!(loaded.title, config.title);
-        assert_eq!(loaded.pattern, config.pattern);
-        std::fs::remove_file(&path).ok();
+        assert_eq!(list_in(&dir), vec!["my-linkedin-look".to_owned()]);
+
+        let loaded = load_in(&dir, &stored).unwrap();
+        assert_eq!(loaded.theme, ThemeName::Ai);
+
+        delete_in(&dir, &stored).unwrap();
+        assert!(list_in(&dir).is_empty());
+
+        std::fs::remove_dir_all(&dir).ok();
     }
 
     #[test]
-    fn default_path_points_at_config_dir() {
-        let path = default_path();
-        assert!(path.ends_with("preset.toml"));
-        assert!(
-            path.to_string_lossy()
-                .contains("article-cover-art-generator")
-        );
+    fn list_sorts_and_ignores_non_toml() {
+        let dir = temp_dir("sort");
+        std::fs::create_dir_all(&dir).unwrap();
+        save_in(&dir, "zeta", &CoverConfig::default()).unwrap();
+        save_in(&dir, "alpha", &CoverConfig::default()).unwrap();
+        std::fs::write(dir.join("notes.txt"), b"ignore me").unwrap();
+        assert_eq!(list_in(&dir), vec!["alpha".to_owned(), "zeta".to_owned()]);
+        std::fs::remove_dir_all(&dir).ok();
     }
 
     #[test]
-    fn load_errors_on_missing_and_invalid_files() {
-        assert!(load(Path::new("/no/such/acag/preset.toml")).is_err());
-        let path = std::env::temp_dir().join(format!("acag-bad-{}.toml", std::process::id()));
-        std::fs::write(&path, "this = is = not = toml").unwrap();
-        assert!(load(&path).is_err());
-        std::fs::remove_file(&path).ok();
+    fn load_and_delete_error_on_missing() {
+        let dir = temp_dir("missing");
+        std::fs::create_dir_all(&dir).unwrap();
+        assert!(load_in(&dir, "nope").is_err());
+        assert!(delete_in(&dir, "nope").is_err());
+        std::fs::remove_dir_all(&dir).ok();
     }
 
     #[test]
-    fn save_errors_when_parent_is_unusable() {
-        let blocker = std::env::temp_dir().join(format!("acag-pblock-{}", std::process::id()));
-        std::fs::write(&blocker, b"x").unwrap();
-        let path = blocker.join("preset.toml");
-        assert!(save(&CoverConfig::default(), &path).is_err());
-        std::fs::remove_file(&blocker).ok();
+    fn presets_dir_honors_env_override() {
+        // SAFETY: only this test touches this variable.
+        unsafe { std::env::set_var("ACAG_PRESETS_DIR", "/tmp/acag-presets-x") };
+        assert_eq!(presets_dir(), PathBuf::from("/tmp/acag-presets-x"));
+        unsafe { std::env::remove_var("ACAG_PRESETS_DIR") };
     }
 }