1 files changed, 42 insertions, 0 deletions
diff --git a/users/Profpatsch/arglib/netencode.nix b/users/Profpatsch/arglib/netencode.nix
new file mode 100644
index 000000000000..3f1d121e5132
--- /dev/null
+++ b/users/Profpatsch/arglib/netencode.nix
@@ -0,0 +1,42 @@
+{ depot, pkgs, lib, ... }:
+
+let
+  netencode = {
+    rust = depot.nix.writers.rustSimpleLib
+      {
+        name = "arglib-netencode";
+        dependencies = [
+          depot.users.Profpatsch.execline.exec-helpers
+          depot.users.Profpatsch.netencode.netencode-rs
+        ];
+      } ''
+      extern crate netencode;
+      extern crate exec_helpers;
+
+      use netencode::{T};
+      use std::os::unix::ffi::OsStrExt;
+
+      pub fn arglib_netencode(prog_name: &str, env: Option<&std::ffi::OsStr>) -> T {
+          let env = match env {
+              None => std::ffi::OsStr::from_bytes("ARGLIB_NETENCODE".as_bytes()),
+              Some(a) => a
+          };
+          let t = match std::env::var_os(env) {
+              None => exec_helpers::die_user_error(prog_name, format!("could not read args, envvar {} not set", env.to_string_lossy())),
+              // TODO: good error handling for the different parser errors
+              Some(soup) => match netencode::parse::t_t(soup.as_bytes()) {
+                  Ok((remainder, t)) => match remainder.is_empty() {
+                      true => t,
+                      false => exec_helpers::die_environment_problem(prog_name, format!("arglib: there was some unparsed bytes remaining: {:?}", remainder))
+                  },
+                  Err(err) => exec_helpers::die_environment_problem(prog_name, format!("arglib parsing error: {:?}", err))
+              }
+          };
+          std::env::remove_var(env);
+          t
+      }
+    '';
+  };
+
+in
+depot.nix.readTree.drvTargets netencode