cairo1-run CLI: Allow loading arguments from file (#1739)

* Accept args from file

* Add doc

* Add changelog entry

---------

Co-authored-by: Pedro Fontana <[email protected]>

Author: fmoletta

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 #### Upcoming Changes
 
+* `cairo1-run` CLI: Allow loading arguments from file[#1739](https://github.com/lambdaclass/cairo-vm/pull/1739)
+
 * BREAKING: Remove unused `CairoRunner` field `original_steps`[#1742](https://github.com/lambdaclass/cairo-vm/pull/1742)
 
 * feat: Add `--run_from_cairo_pie` to `cairo-vm-cli` + workflow [#1730](https://github.com/lambdaclass/cairo-vm/pull/1730)

cairo1-run/README.md

@@ -55,6 +55,8 @@ The cairo1-run cli supports the following optional arguments:
 
 * `--args <ARGUMENTS>`: Receives the arguments to be passed to the program's main function. Receives whitespace-separated values which can be numbers or arrays, with arrays consisting of whitespace-separated numbers wrapped between brackets
 
+* `--args_file <FILENAME>`: Receives the name of the file from where arguments should be read. Expects the same argument format of the `--args` flag. Should be used if the list of arguments exceeds the shell's capacity.
+
 * `--trace_file <TRACE_FILE>`: Receives the name of a file and outputs the relocated trace into it
 
 * `--memory_file <MEMORY_FILE>`: Receives the name of a file and outputs the relocated memory into it

cairo1-run/src/main.rs

@@ -44,8 +44,11 @@ struct Args {
     cairo_pie_output: Option<PathBuf>,
     // Arguments should be spaced, with array elements placed between brackets
     // For example " --args '1 2 [1 2 3]'" will yield 3 arguments, with the last one being an array of 3 elements
-    #[clap(long = "args", default_value = "", value_parser=process_args)]
+    #[clap(long = "args", default_value = "", value_parser=process_args, conflicts_with = "args_file")]
     args: FuncArgs,
+    // Same rules from `args` apply here
+    #[clap(long = "args_file", value_parser, value_hint=ValueHint::FilePath, conflicts_with = "args")]
+    args_file: Option<PathBuf>,
     #[clap(long = "print_output", value_parser)]
     print_output: bool,
     #[clap(
@@ -129,7 +132,10 @@ impl FileWriter {
 }
 
 fn run(args: impl Iterator<Item = String>) -> Result<Option<String>, Error> {
-    let args = Args::try_parse_from(args)?;
+    let mut args = Args::try_parse_from(args)?;
+    if let Some(filename) = args.args_file {
+        args.args = process_args(&std::fs::read_to_string(filename)?).unwrap();
+    }
 
     let cairo_run_config = Cairo1RunConfig {
         proof_mode: args.proof_mode,