From a4a7d107fe2c82b1070a72dcf5a6cf5decdaf960 Mon Sep 17 00:00:00 2001
From: Akshay <nerdypepper@tuta.io>
Date: Thu, 19 Mar 2020 17:21:14 +0530
Subject: implement custom path, simpler api

---
 fondant_derive/src/lib.rs | 73 ++++++++++++++++++++++++++---------------------
 1 file changed, 41 insertions(+), 32 deletions(-)

diff --git a/fondant_derive/src/lib.rs b/fondant_derive/src/lib.rs
index 946c130..0c66d62 100644
--- a/fondant_derive/src/lib.rs
+++ b/fondant_derive/src/lib.rs
@@ -1,16 +1,15 @@
 extern crate proc_macro;
 
 use ::std::ffi::{OsStr, OsString};
-use ::std::path::{Path, PathBuf};
-use directories::ProjectDirs;
+use ::std::path::Path;
 use proc_macro::TokenStream;
 use proc_macro2::Span;
 use quote::quote;
-use syn::{parse_macro_input, DeriveInput, Error, Ident, Lit, Meta, MetaNameValue, Result};
+use syn::{parse_macro_input, DeriveInput, Ident, Lit, Meta, MetaNameValue};
 
 #[derive(Debug, Default)]
 struct ConfigPath {
-    parent: Option<PathBuf>,
+    parent: String,
     filename: Option<OsString>,
     extension: Option<OsString>,
 }
@@ -33,13 +32,9 @@ fn extract_attributes(ast: &DeriveInput) -> ConfigPath {
                 if let Lit::Str(f) = lit {
                     let f = f.value();
                     let fp = Path::new(&f);
-                    let blank = Path::new("");
-                    let parent = match fp.parent() {
-                        Some(blank) => None,
-                        other => other,
-                    };
+                    let parent = fp.parent().unwrap_or(Path::new(""));
                     return ConfigPath {
-                        parent: parent.map(Path::to_path_buf),
+                        parent: parent.to_str().unwrap().into(),
                         filename: fp.file_stem().map(OsStr::to_os_string),
                         extension: fp.extension().map(OsStr::to_os_string),
                     };
@@ -80,42 +75,53 @@ fn gen_impl(ast: &DeriveInput, cfg_path: ConfigPath) -> TokenStream {
 
     let filename = cfg_path
         .filename
-        .unwrap_or(OsStr::new("config").to_os_string());
+        .unwrap_or(OsStr::new("config").to_os_string())
+        .into_string()
+        .unwrap();
+
     let filetype = cfg_path
         .extension
-        .unwrap_or(OsStr::new("toml").to_os_string());
-
-    let filename = filename.into_string().unwrap();
-    let filetype = filetype.into_string().unwrap();
-
-    let pkg_name = env!("CARGO_PKG_NAME");
-    let project = ProjectDirs::from("rs", "", pkg_name).unwrap();
-    let default_dir = project.config_dir();
-    let config_dir = cfg_path.parent.as_deref().unwrap_or(default_dir);
-
-    let tip = Path::new(&filename).with_extension(&filetype);
-    let config_file = [config_dir, tip.as_ref()]
-        .iter()
-        .collect::<PathBuf>()
-        .into_os_string()
+        .unwrap_or(OsStr::new("toml").to_os_string())
         .into_string()
         .unwrap();
-    let parent: String = config_dir.to_str().unwrap().into();
+
+    let parent = cfg_path.parent;
 
     let (ser, ser_fn) = pick_serializer(&filetype);
 
-    let gen = quote! {
-        use ::fondant::{Configure, ProjectDirs, toml, serde_json, serde_yaml, FondantError};
+    let includes = quote! {
+        use ::fondant::*;
         use ::std::option::Option;
         use ::std::fs::{self, File, OpenOptions};
         use ::std::io::prelude::*;
         use ::std::io::{ ErrorKind::NotFound, Write };
         use ::std::ffi::{OsStr, OsString};
         use ::std::path::{Path, PathBuf};
+    };
 
+    let load_paths = quote! {
+        let pkg_name = env!("CARGO_PKG_NAME");
+        let project = ProjectDirs::from("rs", "", pkg_name).unwrap();
+        let default_dir: String = project.config_dir().to_str().unwrap().into();
+
+        let d = if #parent != "" { #parent.into() } else { default_dir };
+        let config_dir: String = expand_tilde(d)
+            .as_path()
+            .to_str()
+            .unwrap()
+            .into();
+
+        let tip = Path::new(&#filename).with_extension(&#filetype);
+        let mut config_file = PathBuf::from(&config_dir);
+        config_file.push(tip);
+    };
+
+    let gen = quote! {
+        #includes
         impl Configure for #struct_ident {
             fn load() -> Result<#struct_ident, FondantError> {
-                match File::open(&#config_file) {
+                #load_paths
+                match File::open(&config_file) {
                     Ok(mut cfg) => {
                         let mut cfg_data = String::new();
                         cfg.read_to_string(&mut cfg_data);
@@ -125,7 +131,9 @@ fn gen_impl(ast: &DeriveInput, cfg_path: ConfigPath) -> TokenStream {
                         return Ok(config);
                     },
                     Err(ref e) if e.kind() == NotFound => {
-                        fs::create_dir_all(#parent).map_err(FondantError::DirCreateErr)?;
+                        if !Path::new(&config_dir).is_dir() {
+                            fs::create_dir_all(config_dir).map_err(FondantError::DirCreateErr)?;
+                        }
                         let default_impl = #struct_ident::default();
                         Configure::store(&default_impl)?;
                         return Ok(default_impl);
@@ -134,11 +142,12 @@ fn gen_impl(ast: &DeriveInput, cfg_path: ConfigPath) -> TokenStream {
                 };
             }
             fn store(&self) -> Result<(), FondantError> {
+                #load_paths
                 let mut f = OpenOptions::new()
                     .write(true)
                     .create(true)
                     .truncate(true)
-                    .open(#config_file)
+                    .open(config_file)
                     .map_err(|_| FondantError::FileOpenError)?;
 
                 let s = #ser::#ser_fn(self).map_err(|_| FondantError::ConfigParseError)?;
-- 
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