Some relevant docstrings

src/commands.rs

@@ -1,5 +1,6 @@
 use clap::{arg, ArgAction, Command};
 
+// Generate command line options for the csv command
 pub fn gen_csv_command() -> Command {
     Command::new("csv")
         .about("Read csv, output arrow stream")
@@ -29,6 +30,7 @@ pub fn gen_csv_command() -> Command {
         )
 }
 
+// Generate command line options for the schema command
 pub fn gen_schema_command() -> Command {
     Command::new("schema")
         .about("Several table schema related utilities")
@@ -52,6 +54,7 @@ pub fn gen_schema_command() -> Command {
         )
 }
 
+// Generate command line options for the sql command
 pub fn gen_sql_command() -> Command {
     Command::new("sql")
         .about("Runs a sql statement on the file")
@@ -65,6 +68,7 @@ pub fn gen_sql_command() -> Command {
         .arg(arg!(-d --delimiter <String> "Column delimiter").required(false))
 }
 
+// Generate command line options for the rpq command
 pub fn gen_rpq_command() -> Command {
     Command::new("rpq")
         .about("Read parquet file")
@@ -93,6 +97,7 @@ pub fn gen_rpq_command() -> Command {
         )
 }
 
+// Generate command line options for the wpq command
 pub fn gen_wpq_command() -> Command {
     Command::new("wpq")
         .about("Write to a paquet file")
@@ -105,6 +110,7 @@ pub fn gen_wpq_command() -> Command {
         .arg(arg!([path] "Path to the new parquet file"))
 }
 
+// Generate command line options for the print command
 pub fn gen_print_command() -> Command {
     Command::new("print")
         .about("Pretty prints the table")

src/handlers.rs

@@ -1,9 +1,10 @@
 use crate::io;
-use crate::sql;
 use crate::schema;
+use crate::sql;
 use clap::ArgMatches;
 use polars_lazy::prelude::LazyFrame;
 
+// Handle csv command
 pub fn handle_csv(matches: &ArgMatches) {
     let delimiter = match matches.get_one::<String>("delimiter") {
         Some(delimiter) => delimiter.as_bytes()[0],
@@ -39,6 +40,7 @@ pub fn handle_csv(matches: &ArgMatches) {
     }
 }
 
+// Handle the SQL command
 pub fn handle_sql(matches: &ArgMatches) {
     let delimiter = match matches.get_one::<String>("delimiter") {
         Some(delimiter) => delimiter.as_bytes()[0],
@@ -57,6 +59,7 @@ pub fn handle_sql(matches: &ArgMatches) {
     }
 }
 
+// Handle the print command
 pub fn handle_print(matches: &ArgMatches) {
     let delimiter = match matches.get_one::<String>("delimiter") {
         Some(delimiter) => delimiter.as_bytes()[0],
@@ -70,6 +73,7 @@ pub fn handle_print(matches: &ArgMatches) {
     println!("{}", df.collect().expect("Could not collect"));
 }
 
+// Handle the rpq command
 pub fn handle_rpq(matches: &ArgMatches) {
     let mut ldf = LazyFrame::default();
     if matches.get_flag("stdin") {
@@ -99,9 +103,9 @@ pub fn handle_rpq(matches: &ArgMatches) {
             }
         }
     }
-
 }
 
+// Handle the wpq command
 pub fn handle_wpq(matches: &ArgMatches) {
     let delimiter = match matches.get_one::<String>("delimiter") {
         Some(delimiter) => delimiter.as_bytes()[0],
@@ -119,6 +123,7 @@ pub fn handle_wpq(matches: &ArgMatches) {
     }
 }
 
+// Handle the schema command
 pub fn handle_schema(matches: &ArgMatches) {
     let delimiter = match matches.get_one::<String>("delimiter") {
         Some(delimiter) => delimiter.as_bytes()[0],

src/main.rs

@@ -6,6 +6,7 @@ mod sql;
 use clap::command;
 
 fn main() {
+    // Commands definition
     let matches = command!()
         .subcommand(commands::gen_csv_command())
         .subcommand(commands::gen_schema_command())
@@ -14,6 +15,8 @@ fn main() {
         .subcommand(commands::gen_rpq_command())
         .subcommand(commands::gen_wpq_command())
         .get_matches();
+
+    // Send the flow to the corresponding handler
     if let Some(sub_matches) = matches.subcommand_matches("csv") {
         handlers::handle_csv(sub_matches);
     } else if let Some(sub_matches) = matches.subcommand_matches("sql") {