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use std::collections::HashMap;
use std::fs;
use std::path::Path;
use quote::{quote, ToTokens};
use structopt::StructOpt;
use crate::db::migration::{CreateModelOption, DatabaseChange, Migration};
use crate::db::models::{Field, ModelMeta};
use crate::{Settings, UrlMap};
#[derive(StructOpt)]
/// Generate migrations
pub struct MakeMigrations {}
#[derive(Debug)]
struct AppTablesState {
db: HashMap<&'static str, TableState>,
}
#[derive(Debug)]
struct TableState {
fields: Vec<Field>,
}
impl AppTablesState {
fn changes_to(self, dest: AppTablesState) -> Vec<impl ToTokens> {
let mut result = vec![];
for table in dest.db.keys() {
if !self.db.contains_key(table) {
let fields = &dest.db[table].fields.iter().map(|field| {
match field {
Field::CharField { name, max_length: Some(max_length) } => quote! { Field::CharField { name: #name, max_length: Some(#max_length) } },
Field::CharField { name, max_length: None } => quote! { Field::CharField { name: #name, max_length: None } },
Field::DateTimeField { name } => quote! { Field::DateTimeField { name: #name } },
Field::IntField { name } => quote! { Field::IntField { name: #name } },
}
}).collect::<Vec<_>>();
result.push(quote! {
DatabaseChange::CreateModel {
name: #table,
fields: &[
#(#fields),*
],
options: &[],
}
});
}
}
result
}
}
impl From<&[ModelMeta]> for AppTablesState {
fn from(models: &[ModelMeta]) -> Self {
let mut db = HashMap::new();
for model in models {
db.insert(
model.name,
TableState {
fields: model.fields.into(),
},
);
}
Self { db }
}
}
impl From<&[Migration]> for AppTablesState {
fn from(migrations: &[Migration]) -> Self {
let mut db = HashMap::new();
for migration in migrations {
for change in migration.changes {
match change {
DatabaseChange::CreateModel {
name,
fields,
options,
} => {
if db.contains_key(name) {
if options.contains(&CreateModelOption::IfNotExist) {
continue;
} else {
panic!("double-created table {}", name);
}
}
db.insert(
*name,
TableState {
fields: (*fields).into(),
},
);
}
}
}
}
Self { db }
}
}
impl MakeMigrations {
pub fn execute(self, _urls: UrlMap, settings: Settings) {
for app in settings.installed_apps {
let expected_table_state = AppTablesState::from(app.models);
let actual_table_state = AppTablesState::from(app.migrations);
let next_id = app
.migrations
.iter()
.map(|m| m.id)
.max()
.map_or(1, |x| x + 1);
let name = "auto"; // TODO names
let changes = actual_table_state.changes_to(expected_table_state);
if changes.is_empty() {
continue;
}
let migration = quote! {
Migration {
id: #next_id,
name: #name,
prereqs: &[], // TODO
changes: &[ #(#changes),* ],
}
};
let file = quote! {
use tosin::db::migration::{DatabaseChange, Migration};
use tosin::db::models::Field;
pub const MIGRATION: Migration = #migration;
};
let file_name = format!("m_{:04}_{}.rs", next_id, name);
let file_text = file.into_token_stream().to_string();
let app_mod_rs = Path::new(app.mod_rs_path);
let app_folder = app_mod_rs
.parent()
.expect("app mod.rs lives at filesystem root???");
let migrations_dir = app_folder.join("migrations");
let file_path = migrations_dir.join(file_name);
println!("Saving migration to {}...", file_path.display());
fs::write(file_path, file_text).unwrap();
// update mod.rs bc the fancy gather!() shit doesn't actually invalidate partial compilation
let migrations: Vec<syn::Ident> = migrations_dir
.read_dir()
.unwrap()
.map(Result::unwrap)
.map(|x| x.path().file_stem().unwrap().to_string_lossy().into_owned())
.filter(|x| x != "mod")
.map(|x| syn::parse_str(&x).unwrap())
.collect();
let mod_file = quote! {
use tosin::db::migration::Migration;
#( mod #migrations; )*
pub const ALL: &[Migration] = &[
#(#migrations::MIGRATION),*
];
};
let mod_file_path = migrations_dir.join("mod.rs");
let mod_file_text = mod_file.into_token_stream().to_string();
fs::write(mod_file_path, mod_file_text).unwrap();
// TODO cargo fmt
}
}
}
|
