build form from yaml

.gitignore

@@ -1,4 +1,4 @@
 /target
 **/*.rs.bk
 .idea/
-inventory.json
+

Cargo.lock

@@ -174,6 +174,11 @@ dependencies = [
  "generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "dtoa"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "educe"
 version = "0.4.2"
@@ -304,6 +309,28 @@ dependencies = [
  "unicode-normalization 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ifmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ifmt-impl 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ifmt-impl"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.3.0"
@@ -382,6 +409,11 @@ name = "libc"
 version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "lock_api"
 version = "0.3.2"
@@ -633,6 +665,16 @@ dependencies = [
  "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
@@ -733,13 +775,16 @@ dependencies = [
 name = "rocket-inv"
 version = "0.1.0"
 dependencies = [
+ "ifmt 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "json_dotpath 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket-download-response 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_contrib 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_yaml 0.8.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -841,6 +886,17 @@ dependencies = [
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.8.1"
@@ -1136,6 +1192,14 @@ dependencies = [
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "yaml-rust"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "yansi"
 version = "0.4.0"
@@ -1169,6 +1233,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum devise_codegen 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "066ceb7928ca93a9bedc6d0e612a8a0424048b0ab1f75971b203d01420c055d7"
 "checksum devise_core 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cf41c59b22b5e3ec0ea55c7847e5f358d340f3a8d6d53a5cf4f1564967f96487"
 "checksum digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
+"checksum dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ea57b42383d091c85abcc2706240b94ab2a8fa1fc81c10ff23c4de06e2a90b5e"
 "checksum educe 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d27c760a73a13abb1ddf417c06bc2b8d14b0607dd19097316e0ca9412a971088"
 "checksum error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3ab49e9dcb602294bc42f9a7dfc9bc6e936fca4418ea300dbfb84fe16de0b7d9"
 "checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
@@ -1185,6 +1250,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum humansize 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b6cab2627acfc432780848602f3f558f7e9dd427352224b0d9324025796d2a5e"
 "checksum hyper 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)" = "0a0652d9a2609a968c14be1a9ea00bf4b1d64e2e1f53a1b51b6fff3a6e829273"
 "checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
+"checksum ifmt 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "abec215007c2ef1ccfb17a6bae6a87736fedb573860d2606ddec08b427666164"
+"checksum ifmt-impl 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "744691ef283c5d8d4321f75cfa0e3b460b5adf3338bb7dcfd060f33e40300072"
 "checksum indexmap 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712d7b3ea5827fcb9d4fda14bf4da5f136f0db2ae9c8f4bd4e2d1c6fde4e6db2"
 "checksum inotify 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "40b54539f3910d6f84fbf9a643efd6e3aa6e4f001426c0329576128255994718"
 "checksum inotify-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e74a1aa87c59aeff6ef2cc2fa62d41bc43f54952f55652656b18a02fd5e356c0"
@@ -1196,6 +1263,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 "checksum libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)" = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
+"checksum linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ae91b68aebc4ddb91978b11a1b02ddd8602a05ec19002801c5666000e05e0f83"
 "checksum lock_api 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e57b3997725d2b60dbec1297f6c2e2957cc383db1cebd6be812163f969c7d586"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
@@ -1224,6 +1292,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum pest_derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "833d1ae558dc601e9a60366421196a8d94bc0ac980476d0b67e1d0988d72b2d0"
 "checksum pest_generator 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7b9fcf299b5712d06ee128a556c94709aaa04512c4dffb8ead07c5c998447fc0"
 "checksum pest_meta 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "df43fd99896fd72c485fe47542c7b500e4ac1e8700bf995544d1317a60ded547"
+"checksum proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 "checksum proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "9c9e470a8dc4aeae2dee2f335e8f533e2d4b347e1434e5671afc49b054592f27"
 "checksum quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
@@ -1245,6 +1314,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)" = "414115f25f818d7dfccec8ee535d76949ae78584fc4f79a6f45a904bf8ab4449"
 "checksum serde_derive 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)" = "128f9e303a5a29922045a830221b8f78ec74a5f544944f3d5984f8ec3895ef64"
 "checksum serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)" = "48c575e0cc52bdd09b47f330f646cf59afc586e9c4e3ccd6fc1f625b8ea1dad7"
+"checksum serde_yaml 0.8.11 (registry+https://github.com/rust-lang/crates.io-index)" = "691b17f19fc1ec9d94ec0b5864859290dff279dbd7b03f017afda54eb36c3c35"
 "checksum sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23962131a91661d643c98940b20fcaffe62d776a823247be80a48fcb8b6fce68"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum slug 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b3bc762e6a4b6c6fcaade73e77f9ebc6991b676f88bb2358bddb56560f073373"
@@ -1285,5 +1355,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+"checksum yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "65923dd1784f44da1d2c3dbbc5e822045628c590ba72123e1c73d3c230c4434d"
 "checksum yansi 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d60c3b48c9cdec42fb06b3b84b5b087405e1fa1c644a1af3930e4dfafe93de48"
 "checksum yansi 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9fc79f4a1e39857fc00c3f662cbf2651c771f00e9c15fe2abc341806bd46bd71"

Cargo.toml

@@ -12,9 +12,12 @@ rocket-download-response = "0.4.9"
 
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+serde_yaml = "0.8.11"
 json_dotpath = "0.1.2"
 
+ifmt = "0.2.0"
 parking_lot = "0.10.0"
+lazy_static = "1.4.0"
 
 [dependencies.rocket]
 version = "0.4.2"

data/repository.yaml

@@ -0,0 +1,32 @@
+model:
+  fields:
+    category:
+      type: "free_enum"
+    generic_code:
+      type: "free_enum"
+    code:
+      type: "string"
+    value:
+      type: "string"
+    package:
+      type: "free_enum"
+    mounting:
+      type: "enum"
+      options:
+        - "SMD"
+        - "Through-hole"
+        - "Screw"
+    quantity:
+      type: "int"
+      min: 0
+    location:
+      type: "free_enum"
+    sublocation:
+      label: "Sub-location"
+      type: "string"
+    tags:
+      type: "free_tags"
+    note:
+      type: "text"
+    checkbox:
+      type: "bool"

src/main.rs

@@ -5,7 +5,7 @@
 
 //use rocket::request::FromSegments;
 //use rocket::http::uri::Segments;
-//use rocket_contrib::serve::StaticFiles;
+use rocket_contrib::serve::StaticFiles;
 use rocket_contrib::templates::Template;
 
 mod store;
@@ -16,24 +16,42 @@ use rocket::response::Redirect;
 use rocket::http::Status;
 use rocket::request::Form;
 use std::collections::HashMap;
+use std::env;
+use crate::store::form::RenderedField;
+
+#[derive(Serialize)]
+struct FormContext<'a> {
+    pub fields : Vec<RenderedField<'a>>,
+}
 
 #[get("/")]
 fn index(store : State<RwLock<Store>>) -> Template {
-    let mut context = HashMap::new();
     let rg = store.read();
-    context.insert("records", &rg.parts);
+
+    let indexes = &rg.index;
+    let context = FormContext {
+        fields: rg.model.fields.iter().map(|(key, field)| {
+            RenderedField::from_template_field(key, field, None, indexes)
+        }).collect()
+    };
+
     Template::render("index", context)
 }
 
-#[post("/add", data="<record>")]
+//#[post("/add", data="<record>")]
-fn add_part(store : State<RwLock<Store>>, record : Form<store::Part>) -> Redirect {
+//fn add_part(store : State<RwLock<Store>>, record : Form<store::Part>) -> Redirect {
-    store.write().add(record.into_inner());
+//    store.write().add(record.into_inner());
-    Redirect::to(uri!(index))
+//    Redirect::to(uri!(index))
-}
+//}
 
 fn main() {
+    let cwd = env::current_dir().unwrap();
+    let data_dir = cwd.join("data");
+    let store = Store::new(data_dir);
+
     rocket::ignite()
         .attach(Template::fairing())
-        .manage(RwLock::new(Store::new()))
+        .manage(RwLock::new(store))
-        .mount("/", routes![index, add_part]).launch();
+        .mount("/", StaticFiles::from(cwd.join("templates/static/")))
+        .mount("/", routes![index]).launch();
 }

src/store/form.rs

@@ -0,0 +1,127 @@
+use crate::store::model::FieldKind;
+use serde_json::Value;
+use std::borrow::Cow;
+use crate::store::{model, Indexes};
+
+use lazy_static::lazy_static;
+
+lazy_static! {
+    /// This is an example for using doc comment attributes
+    static ref EMPTY_VEC: Vec<String> = vec![];
+}
+
+#[derive(Serialize, Debug, Default)]
+pub struct RenderedField<'a> {
+    pub key: Cow<'a, str>,
+    pub label: Cow<'a, str>,
+    pub kind: &'static str,
+    pub step: &'static str,
+    pub min: String,
+    pub max: String,
+    pub options: Option<&'a Vec<String>>,
+    pub value: Cow<'a, str>,
+    pub checked: bool,
+}
+
+impl<'a> RenderedField<'a> {
+    pub fn from_template_field<'i>(
+        key: &'i String,
+        field: &'i model::Field,
+        value: Option<&'i Value>,
+        index: &'i Indexes
+    ) -> RenderedField<'i> {
+        let mut rendered = RenderedField::default();
+        rendered.key = key.as_str().into();
+        rendered.label = if field.label.is_empty() {
+            rendered.key.clone()
+        } else {
+            field.label.as_str().into()
+        };
+
+        match &field.kind {
+            FieldKind::String => {
+                rendered.kind = "string";
+
+                if let Some(Value::String(s)) = value {
+                    rendered.value = Cow::Borrowed(&s.as_str());
+                }
+            }
+            FieldKind::Text => {
+                rendered.kind = "text";
+
+                if let Some(Value::String(s)) = value {
+                    rendered.value = Cow::Borrowed(&s.as_str());
+                }
+            }
+            FieldKind::Bool { default } => {
+                rendered.kind = "bool";
+
+                rendered.checked = if let Some(Value::Bool(v)) = value {
+                    *v
+                } else {
+                    *default
+                }
+            }
+            FieldKind::Int { min, max, default } => {
+                rendered.kind = "number";
+
+                let num = if let Some(Value::Number(n)) = value {
+                    n.as_i64().expect("Error parsing number")
+                } else {
+                    *default
+                };
+
+                if let Some(n) = min {
+                    rendered.min = n.to_string();
+                }
+
+                if let Some(n) = max {
+                    rendered.max = n.to_string();
+                }
+
+                rendered.value = Cow::Owned(num.to_string());
+                rendered.step = "1";
+            }
+            FieldKind::Float { min, max, default } => {
+                rendered.kind = "number";
+
+                let num = if let Some(Value::Number(n)) = value {
+                    n.as_f64().expect("Error parsing number")
+                } else {
+                    *default
+                };
+
+                if let Some(n) = min {
+                    rendered.min = n.to_string();
+                }
+
+                if let Some(n) = max {
+                    rendered.max = n.to_string();
+                }
+
+                rendered.value = Cow::Owned(num.to_string());
+                rendered.step = "any";
+            }
+            FieldKind::Enum { options, default } => {
+                rendered.kind = "select";
+                rendered.options = Some(options);
+            }
+            FieldKind::FreeEnum { enum_group } => {
+                rendered.kind = "free_select";
+                let group = enum_group.as_ref().unwrap_or(key);
+                rendered.options = Some(index.free_enums.get(group).unwrap_or(&EMPTY_VEC))
+            }
+            FieldKind::Tags { options } => {
+                rendered.kind = "select";
+                rendered.options = Some(options);
+            }
+            FieldKind::FreeTags { tag_group } => {
+                rendered.kind = "free_select";
+                let group = tag_group.as_ref().unwrap_or(key);
+                rendered.options = Some(index.free_tags.get(group).unwrap_or(&EMPTY_VEC))
+            }
+        }
+
+        rendered
+    }
+}

src/store/mod.rs

@@ -1,52 +1,88 @@
 use std::fs::{File, OpenOptions};
 use std::io::{Read, Write, Error};
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use rocket::request::FromForm;
+use crate::store::model::Model;
+use std::collections::HashMap;
 
-#[derive(Serialize,Deserialize)]
+pub mod model;
+pub mod form;
+
+/// Store instance
+#[derive(Debug)]
 pub struct Store {
-    pub parts : Vec<Part>
+    path : PathBuf,
+    pub model: Model,
+    pub items : HashMap<usize, serde_json::Value>,
+    pub index : Indexes,
 }
 
-#[derive(Serialize,Deserialize,FromForm)]
+/// Indexes loaded from the indexes file
-pub struct Part {
+#[derive(Serialize,Deserialize,Debug,Default)]
-    name : String,
+pub struct Indexes {
-    quantity : usize,
+    pub free_enums : HashMap<String, Vec<String>>,
-    location : String,
+    pub free_tags : HashMap<String, Vec<String>>,
 }
 
-fn load_file_or(file : impl AsRef<Path>, def : String) -> String {
+/// Struct loaded from the repositroy config file
-    let mut file = match File::open(file) {
+#[derive(Serialize,Deserialize,Debug)]
-        Ok(file) => file,
+struct RepositoryConfig {
-        Err(_) => return def
+    pub model : Model,
-    };
-
-    let mut buf = String::new();
-    if file.read_to_string(&mut buf).is_err() {
-        return def;
 }
 
-    buf
+const REPO_CONFIG_FILE : &'static str = "repository.yaml";
-}
+const REPO_DATA_FILE : &'static str = "data.json";
+const REPO_INDEX_FILE : &'static str = "index.json";
 
 impl Store {
-    pub fn new() -> Self {
+    pub fn new(path: impl AsRef<Path>) -> Self {
-        let mut file = load_file_or("inventory.json", "[]".to_string());
+        let file = load_file(path.as_ref().join(REPO_CONFIG_FILE));
+
+        let repository_config : RepositoryConfig = serde_yaml::from_str(&file)
+            .expect("Error parsing repository config file.");
+
+        let items = load_file_or(path.as_ref().join(REPO_DATA_FILE), "{}");
+        let indexes = load_file_or(path.as_ref().join(REPO_INDEX_FILE), "{}");
 
         Store {
-            parts: serde_json::from_str(&file).unwrap(),
+            path: path.as_ref().into(),
+            model: repository_config.model,
+            items: serde_json::from_str(&items).expect("Error parsing data file."),
+            index: serde_json::from_str(&indexes).unwrap_or_default(),
+        }
+    }
+
+    pub fn persist(&self) {
+        let mut file = OpenOptions::new()
+            .write(true)
+            .create(true)
+            .truncate(true)
+            .open(self.path.join(REPO_DATA_FILE))
+            .expect("Error opening data file for writing.");
+
+        let serialized = serde_json::to_string(&self.items).expect("Error serialize.");
+        file.write(serialized.as_bytes()).expect("Error write data file");
     }
 }
 
-    pub fn add(&mut self, part : Part) {
+fn load_file(path: impl AsRef<Path>) -> String {
-        self.parts.push(part);
+    let mut file= File::open(&path).expect(&format!("Error opening file {}", path.as_ref().display()));
 
-        self.persist()
+    let mut buf = String::new();
+    file.read_to_string(&mut buf).expect(&format!("Error reading file {}", path.as_ref().display()));
+    buf
 }
 
-    pub fn persist(&self) {
+fn load_file_or(file : impl AsRef<Path>, def : impl Into<String>) -> String {
-        let mut file = OpenOptions::new().write(true).create(true).truncate(true).open("inventory.json").unwrap();
+    let mut file = match File::open(file) {
+        Ok(file) => file,
+        Err(_) => return def.into()
+    };
 
-        file.write(serde_json::to_string(&self.parts).unwrap().as_bytes()).unwrap();
+    let mut buf = String::new();
+    if file.read_to_string(&mut buf).is_err() {
+        return def.into();
     }
+
+    buf
 }

src/store/model.rs

@@ -0,0 +1,96 @@
+use std::collections::HashMap;
+
+/// A data card's model.
+/// Cards of one model can be sorted, searched and filtered by their fields.
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Model {
+    /// Fields defined by this model
+    pub fields: HashMap<String, Field>,
+}
+
+/// One field of a model
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Field {
+    /// Field label shown in the user interface
+    #[serde(default)]
+    pub label: String,
+    /// Field data type
+    #[serde(flatten)]
+    pub kind: FieldKind,
+}
+
+/// Field data type and validations
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(tag = "type")]
+#[serde(rename_all = "snake_case")]
+pub enum FieldKind {
+    /// Single-line text entry
+    String,
+
+    /// Long-form text entry, can have multiple rows
+    Text,
+
+    /// Checkbox or a toggle switch
+    Bool {
+        /// Default value when the model's card is created
+        #[serde(default)]
+        default: bool,
+    },
+
+    /// Integer entry
+    Int {
+        /// Lowest allowed value
+        #[serde(default)]
+        min: Option<i64>,
+        /// Highest allowed value
+        #[serde(default)]
+        max: Option<i64>,
+        /// Default value
+        #[serde(default)]
+        default: i64,
+    },
+
+    /// Floating point entry
+    Float {
+        /// Lowest allowed value
+        #[serde(default)]
+        min: Option<f64>,
+        /// Highest allowed value
+        #[serde(default)]
+        max: Option<f64>,
+        /// Default value
+        #[serde(default)]
+        default: f64,
+    },
+
+    /// Enumeration entry with a fixed set of options
+    Enum {
+        /// Options to choose from, must not be empty
+        options: Vec<String>,
+        /// Default option (if not the first)
+        #[serde(default)]
+        default: Option<String>,
+    },
+
+    /// Enum that can be freely expanded by the user
+    FreeEnum {
+        /// Group name.
+        /// If not set, a private group for this particular field is used.
+        #[serde(default)]
+        enum_group: Option<String>,
+    },
+
+    /// Tags with a fixed set of options to choose from
+    Tags {
+        /// Options to choose from
+        options: Vec<String>,
+    },
+
+    /// Tags that can be freely added by the user
+    FreeTags {
+        /// Group name.
+        /// If not set, a private group for this particular field is used.
+        #[serde(default)]
+        tag_group: Option<String>,
+    },
+}

templates/form_macros.html.tera

@@ -0,0 +1,67 @@
+{% macro text(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<input id="field-{{field.key}}"
+	   name="{{field.key}}"
+	   type="text"
+	   value="{{field.value}}">
+{% endmacro %}
+
+{% macro longtext(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<textarea id="field-{{field.key}}" name="{{field.key}}">{{field.value}}</textarea>
+{% endmacro %}
+
+{% macro free_select(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<input id="field-{{field.key}}"
+	   name="{{field.key}}"
+	   type="text"
+	   list="suggestions-{{field.key}}"
+	   value="{{field.value}}">
+
+<datalist id="suggestions-{{field.key}}">
+{% for option in field.options %}
+	<option value="{{option}}">
+{% endfor %}
+</datalist>
+{% endmacro %}
+
+{% macro number(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<input id="field-{{field.key}}"
+	   name="{{field.key}}"
+	   type="number"
+	   value="{{field.value}}"
+	   step="{{field.step}}"
+	   min="{{field.min}}"
+	   max="{{field.max}}">
+{% endmacro %}
+
+{% macro checkbox(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<input id="field-{{field.key}}"
+	   name="{{field.key}}"
+	   type="checkbox"
+	   {% if field.checked %}checked{% endif %}>
+{% endmacro %}
+
+{% macro select(field) %}
+<label for="field-{{field.key}}">
+	{{field.label}}
+</label>
+<select id="field-{{field.key}}" name="{{field.key}}">
+{% for option in field.options %}
+	<option value="{{option}}">{{option}}</option>
+{% endfor %}
+</select>
+{% endmacro %}

templates/index.html.tera

@@ -1,16 +1,47 @@
-<!DOCTYPE html>
+{% extends "layout" %}
+{% import "form_macros" as form %}
+
+{% block title -%}
+	Form
+{%- endblock title %}
+
+{% block content %}
 
 <form action="/add" method="POST">
-	Name: <input type="text" name="name"><br>
+	{% for field in fields %}
-	Qty: <input type="number" step="1" min="0" name="quantity"><br>
+	<div class="Row">
-	Location: <input type="text" name="location"><br>
+		{% if field.kind == "string" %}
-	<button type="submit">Add</button>
+
-</form>
+			{{ form::text(field=field) }}
+
+		{% elif field.kind == "text" %}
+
+			{{ form::longtext(field=field) }}
+
+		{% elif field.kind == "number" %}
+
+			{{ form::number(field=field) }}
+
+		{% elif field.kind == "bool" %}
 
-<ul>
+			{{ form::checkbox(field=field) }}
-{% for record in records %}
+
-	<li>
+		{% elif field.kind == "select" %}
-		{{ record.name }} x {{ record.quantity }} in {{ record.location }}
+
-	</li>
+			{{ form::select(field=field) }}
+
+		{% elif field.kind == "free_select" %}
+
+			{{ form::free_select(field=field) }}
+
+		{% else %}
+
+			{{ field.key }}
+
+		{% endif %}
+	</div>
 	{% endfor %}
-</ul>
+
+	<button type="submit">Add</button>
+</form>
+{% endblock content %}

templates/layout.html.tera

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title>{% block title %}{% endblock title %}</title>
+	<link rel="stylesheet" href="style.css">
+</head>
+<body>
+{% block content %}{% endblock content %}
+</body>
+</html>

templates/static/style.css

@@ -0,0 +1,27 @@
+*, *::before, *::after {
+	box-sizing: border-box;
+}
+
+form .Row {
+	display: flex;
+	padding: .25rem;
+}
+
+form .Row label {
+	flex-shrink: 0;
+	width: 10rem;
+	text-align: right;
+	display: inline-block;
+	padding-right: .5rem;
+}
+
+form .Row input,
+form .Row select {
+	height: 2.1rem;
+}
+
+form .Row textarea {
+	flex-shrink: 1;
+	width: 30rem;
+	height: 6rem;
+}