Use persistent codegen for SqlState and Type

Makes it easier to detect changes and speeds up the build.

.gitignore

@@ -1,3 +1,3 @@
-/target/
+target/
 Cargo.lock
 .cargo/

Cargo.toml

@@ -8,8 +8,7 @@ repository = "https://github.com/sfackler/rust-postgres"
 documentation = "https://sfackler.github.io/rust-postgres/doc/v0.11.3/postgres"
 readme = "README.md"
 keywords = ["database", "postgres", "postgresql", "sql"]
-build = "build/main.rs"
-include = ["src/*", "build/*", "Cargo.toml", "LICENSE", "README.md", "THIRD_PARTY"]
+include = ["src/*", "Cargo.toml", "LICENSE", "README.md", "THIRD_PARTY"]
 
 [lib]
 name = "postgres"
@@ -21,10 +20,6 @@ bench = false
 name = "test"
 path = "tests/test.rs"
 
-[build-dependencies]
-phf_codegen = "0.7"
-regex = "0.1"
-
 [dependencies]
 bufstream = "0.1"
 byteorder = ">= 0.3, < 0.5"

codegen/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "codegen"
+version = "0.1.0"
+authors = ["Steven Fackler <sfackler@gmail.com>"]
+
+[dependencies]
+phf_codegen = "0.7"
+regex = "0.1"

codegen/src/main.rs

@@ -2,15 +2,15 @@ extern crate phf_codegen;
 extern crate regex;
 
 use std::ascii::AsciiExt;
+use std::path::Path;
 
 mod sqlstate;
 mod types;
 
 fn main() {
-    sqlstate::build();
-    types::build();
-
-    println!("cargo:rerun-if-changed=build");
+    let path = Path::new("../src");
+    sqlstate::build(path);
+    types::build(path);
 }
 
 fn snake_to_camel(s: &str) -> String {

codegen/src/sqlstate.rs

@@ -1,8 +1,6 @@
-use std::env;
 use std::fs::File;
 use std::io::{Write, BufWriter};
 use std::path::Path;
-use std::convert::AsRef;
 use phf_codegen;
 
 use snake_to_camel;
@@ -14,11 +12,8 @@ struct Code {
     variant: String,
 }
 
-pub fn build() {
-    let path = env::var_os("OUT_DIR").unwrap();
-    let path: &Path = path.as_ref();
-    let path = path.join("sqlstate.rs");
-    let mut file = BufWriter::new(File::create(&path).unwrap());
+pub fn build(path: &Path) {
+    let mut file = BufWriter::new(File::create(path.join("error/sqlstate.rs")).unwrap());
 
     let codes = parse_codes();
 

codegen/src/types.rs

@@ -1,7 +1,6 @@
 use regex::Regex;
 use std::ascii::AsciiExt;
 use std::collections::BTreeMap;
-use std::env;
 use std::fs::File;
 use std::io::{Write, BufWriter};
 use std::path::Path;
@@ -19,11 +18,8 @@ struct Type {
     doc: String,
 }
 
-pub fn build() {
-    let path = env::var_os("OUT_DIR").unwrap();
-    let path: &Path = path.as_ref();
-    let path = path.join("type.rs");
-    let mut file = BufWriter::new(File::create(&path).unwrap());
+pub fn build(path: &Path) {
+    let mut file = BufWriter::new(File::create(path.join("types/types.rs")).unwrap());
 
     let ranges = parse_ranges();
     let types = parse_types(&ranges);

src/error/mod.rs

@@ -11,7 +11,7 @@ use std::collections::HashMap;
 
 use {Result, DbErrorNew};
 
-include!(concat!(env!("OUT_DIR"), "/sqlstate.rs"));
+include!("sqlstate.rs");
 
 /// A Postgres error or notice.
 #[derive(Clone, PartialEq, Eq)]

src/types/mod.rs

@@ -149,7 +149,7 @@ impl FieldNew for Field {
     }
 }
 
-include!(concat!(env!("OUT_DIR"), "/type.rs"));
+include!("types.rs");
 
 /// Information about an unknown type.
 #[derive(PartialEq, Eq, Clone)]