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#[macro_use]
extern crate structopt;
#[macro_use]
extern crate serde_derive;
use csv;
use structopt::StructOpt;
use std::error::Error;
use std::str;
use indexmap::map::IndexMap;
#[derive(StructOpt, Debug)]
#[structopt(
name = "inventorymgt",
about = "Updates Master Inventory from Supply List CSV.",
long_about = "You can use this terminal program to populate a new csv, products from master inventory and quantitties from the newest supply inventory csv."
)]
pub enum InventoryConfig {
#[structopt(name = "generate")]
Generate {
#[structopt(short = "m", long = "master", default_value = "MasterInventory.csv")]
master_filename: String,
#[structopt(short = "s", long = "supply", default_value = "SupplyInventory.csv")]
supply_filename: String,
},
}
#[derive(Debug, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "PascalCase")]
pub struct MasterPart {
pub ven_code: String,
pub part_number: String,
#[serde(rename = "SKU")]
pub sku: String,
#[serde(deserialize_with = "csv::invalid_option")]
pub total_qty: Option<i32>,
}
impl MasterPart {
pub fn update_qty(&mut self, qty: i32) {
self.total_qty = Some(qty);
}
}
#[derive(Debug, PartialEq, Deserialize)]
#[serde(rename_all = "PascalCase")]
struct SupplyPart<'a> {
ven_code: &'a str,
part_number: &'a [u8],
total_qty: i32,
}
pub struct MasterCache {
pub products: IndexMap<String, Vec<MasterPart>>
}
impl MasterCache {
pub fn from(filename: &str) -> Result<MasterCache, Box<dyn Error>> {
let mut rdr = csv::Reader::from_path(filename)?;
let mut products: IndexMap<String, Vec<MasterPart>> = IndexMap::new();
for result in rdr.deserialize() {
let product: MasterPart = result?;
let ven_code = product.ven_code.clone();
if let Some(v_code) = products.get_mut(&ven_code) {
v_code.push(product);
} else {
products.insert(ven_code, vec![product]);
}
}
Ok(MasterCache {
products,
})
}
pub fn write_csv(&self, filename: &'static str) -> Result<(), Box<dyn Error>> {
let mut wtr = csv::Writer::from_path(filename)?;
for products in self.products.values() {
for product in products {
wtr.serialize(product)?;
}
}
wtr.flush()?;
Ok(())
}
}
pub fn update_master(master_filename: String, supply_filename: String) -> Result<(), Box<dyn Error>> {
let mut master_cache = MasterCache::from(&master_filename)?;
let mut rdr = csv::Reader::from_path(supply_filename)?;
let mut raw_record = csv::ByteRecord::new();
let headers = rdr.byte_headers()?.clone();
while rdr.read_byte_record(&mut raw_record)? {
let product: SupplyPart = raw_record.deserialize(Some(&headers))?;
let ven_code = product.ven_code;
let product_qty = product.total_qty;
if let Some(v_code) = master_cache.products.get_mut(ven_code) {
if let Some(master_product) = v_code.iter_mut().find(|p| p.part_number == str::from_utf8(product.part_number).unwrap()) {
master_product.update_qty(product_qty);
}
}
}
master_cache.write_csv("newmaster.csv")?;
Ok(())
}
pub fn run(config: InventoryConfig) -> Result<(), Box<dyn Error>> {
match config {
InventoryConfig::Generate { master_filename, supply_filename } => update_master(master_filename, supply_filename)?,
}
Ok(())
}