add csv command

Cargo.toml

@@ -1,10 +1,13 @@
 [package]
-name = "rustCli"
+name = "rust-cli"
 version = "0.1.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-anyhow="1.0.86"
-clap = { version = "4.5.13", features = ["derive"] }
+anyhow="1.0.87"
+clap = { version = "4.5.17", features = ["derive"] }
+csv = "1.3.0"
+serde = { version = "1.0.210", features = ["derive"] }
+serde_json = "1.0.128"

data.csv

@@ -0,0 +1,4 @@
+Name,Age,Occupation
+Alice,30,Engineer
+Bob,25,Designer
+Charlie,35,Teacher

output.json

@@ -0,0 +1,17 @@
+[
+  {
+    "Name": "Alice",
+    "Age": 30,
+    "Occupation": "Engineer"
+  },
+  {
+    "Name": "Bob",
+    "Age": 25,
+    "Occupation": "Designer"
+  },
+  {
+    "Name": "Charlie",
+    "Age": 35,
+    "Occupation": "Teacher"
+  }
+]

src/lib.rs

@@ -0,0 +1,3 @@
+mod opts;
+
+pub use opts::Opts;

src/main.rs

@@ -1,38 +1,28 @@
-use clap::Parser;
-
-#[derive(Parser, Debug)]
-#[command(name = "rustCli", version, about="rust命令行工具", long_about = None)]
-struct Opts {
-    #[command(subcommand)]
-    cmd: SubCommand,
-}
-
-#[derive(Parser, Debug)]
-enum SubCommand {
-    #[command(name = "csv", about = "读取csv文件并默认输出json文件")]
-    Csv(CsvOpts),
-}
+mod opts;
 
-#[derive(Parser, Debug)]
-struct CsvOpts {
-    /// Name of the person to greet
-    #[arg(short, long)]
-    input: String,
+use crate::opts::{Opts, Person, SubCommand};
+use clap::Parser;
+use csv::Reader;
+use std::fs;
 
-    /// Output file name
-    #[arg(short, long, default_value = "output.json")]
-    output: String,
+/// rust-li csv -i input.csv -o output.json -d ","
+fn main() -> anyhow::Result<()> {
+    let opts = Opts::parse();
+    match opts.cmd {
+        SubCommand::Csv(opts) => {
+            let mut reader = Reader::from_path(opts.input)?;
 
-    /// Delimiter to use for output file
-    #[arg(short, long, default_value = ",")]
-    delimiter: String,
+            let mut persons: Vec<Person> = Vec::new();
+            // 读取csv文件
+            for record in reader.deserialize() {
+                let person: Person = record?;
+                println!(" {:?}", person);
+                persons.push(person);
+            }
 
-    #[arg(long, default_value_t = true)]
-    header: bool,
-}
-
-/// rustCli csv -i input.csv -o output.json -d ","
-fn main() {
-    let opts = Opts::parse();
-    println!("{:?}", opts);
+            // 输出json文件
+            let result = serde_json::to_string_pretty(&persons)?;
+            Ok(fs::write(opts.output, result)?)
+        }
+    }
 }

src/opts.rs

@@ -0,0 +1,52 @@
+use std::path;
+use clap::Parser;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "PascalCase")]
+pub struct Person {
+    name: String,
+    age: u8,
+    occupation: String,
+}
+
+#[derive(Parser, Debug)]
+#[command(name = "rustCli", version, about="rust命令行工具", long_about = None)]
+pub struct Opts {
+    #[command(subcommand)]
+    pub(crate) cmd: SubCommand,
+}
+
+#[derive(Parser, Debug)]
+pub enum SubCommand {
+    #[command(name = "csv", about = "读取csv文件并默认输出json文件")]
+    Csv(CsvOpts),
+}
+
+#[derive(Parser, Debug)]
+pub struct CsvOpts {
+    /// 文件输入的路径，必填
+    #[arg(short, long, required = true, value_parser = validate_path)]
+    pub input: String,
+
+    /// 文件输入的路径，默认 output.json
+    #[arg(short, long, default_value = "output.json")]
+    pub output: String,
+
+    /// 文件分隔符，默认","
+    #[arg(short, long, default_value = ",")]
+    pub delimiter: String,
+
+    /// 是否有标题行，默认true
+    #[arg(long, default_value_t = true)]
+    pub header: bool,
+}
+
+/// 自定义参数校验器: 校验文件路径是否存在
+fn validate_path(path: &str) -> Result<String, String> {
+    if path::Path::new(path).exists() {
+        Ok(path.to_string())
+    } else {
+        Err(format!("{} 文件不存在", path))
+    }
+}