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use diesel::migration::{Migration, RunMigrationsError};
use diesel::connection::SimpleConnection;
use std::path::{Path, PathBuf};
use std::process::Command;
use std::io::prelude::*;
use std::fs::*;
use std::fs;
pub struct BarrelMigration(PathBuf, String, String, String);
impl Migration for BarrelMigration {
fn file_path(&self) -> Option<&Path> {
Some(self.0.as_path())
}
fn version(&self) -> &str {
&self.1
}
fn run(&self, conn: &SimpleConnection) -> Result<(), RunMigrationsError> {
try!(conn.batch_execute(&self.2));
Ok(())
}
fn revert(&self, conn: &SimpleConnection) -> Result<(), RunMigrationsError> {
try!(conn.batch_execute(&self.3));
Ok(())
}
}
pub fn generate_initial(path: &PathBuf) {
let migr_path = path.join("mod.rs");
println!("Creating {}", migr_path.display());
let mut barrel_migr = fs::File::create(migr_path).unwrap();
barrel_migr.write(b"/// Handle up migrations \n").unwrap();
barrel_migr
.write(b"fn up(migr: &mut Migration) {} \n\n")
.unwrap();
barrel_migr.write(b"/// Handle down migrations \n").unwrap();
barrel_migr
.write(b"fn down(migr: &mut Migration) {} \n")
.unwrap();
}
pub fn migration_from(path: &Path) -> Option<Box<Migration>> {
return match path.join("mod.rs").exists() {
true => Some(run_barrel_migration_wrapper(&path.join("mod.rs"))),
false => None,
};
}
fn version_from_path(path: &Path) -> Result<String, ()> {
path.file_name()
.expect(&format!("Can't get file name from path `{:?}`", path))
.to_string_lossy()
.split('_')
.nth(0)
.map(|s| Ok(s.replace('-', "")))
.unwrap_or_else(|| Err(()))
}
fn run_barrel_migration_wrapper(path: &Path) -> Box<Migration> {
let (up, down) = run_barrel_migration(&path.join("mod.rs"));
let version = version_from_path(path).unwrap();
return Box::new(BarrelMigration(path.to_path_buf(), version, up, down));
}
fn run_barrel_migration(migration: &Path) -> (String, String) {
use tempdir::TempDir;
let dir = TempDir::new("barrel").unwrap();
fs::create_dir_all(&dir.path().join("src")).unwrap();
let ct = dir.path().join("Cargo.toml");
let mut cargo_toml = File::create(&ct).unwrap();
cargo_toml
.write_all(
b"# This file is auto generated by barrel
[package]
name = \"tmp-generator\"
description = \"Doing nasty things with cargo\"
version = \"0.0.0\"
authors = [\"Katharina Fey <kookie@spacekookie.de>\"]
# TODO: Use same `barrel` dependency as crate
[dependencies]
barrel = { git = \"https://github.com/spacekookie/barrel\" }",
)
.unwrap();
let main_file_path = &dir.path().join("src").join("main.rs");
let mut main_file = File::create(&main_file_path).unwrap();
let user_migration = migration.as_os_str().to_os_string().into_string().unwrap();
main_file
.write_all(
format!(
"//! This file is auto generated by barrel
extern crate barrel;
use barrel::*;
// FIXME: Make the backend configurable
use barrel::backend::Pg;
include!(\"{}\");
fn main() {{
let mut m_up = Migration::new();
up(&mut m_up);
println!(\"{{}}\", m_up.make::<Pg>());
let mut m_down = Migration::new();
down(&mut m_down);
println!(\"{{}}\", m_down.make::<Pg>());
}}
",
user_migration
).as_bytes(),
)
.unwrap();
let output = if cfg!(target_os = "windows") {
Command::new("cargo")
.current_dir(dir.path())
.arg("run")
.output()
.expect("failed to execute cargo!")
} else {
Command::new("sh")
.current_dir(dir.path())
.arg("-c")
.arg("cargo run")
.output()
.expect("failed to execute cargo!")
};
let output = String::from_utf8_lossy(&output.stdout);
let vec: Vec<&str> = output.split("\n").collect();
let up = String::from(vec[0]);
let down = String::from(vec[0]);
return (up, down);
}