From 122baa678733636336689feeb4e2c8b4807649db Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Wed, 15 Jan 2020 12:05:06 -0600
Subject: [PATCH] unix/main: Add support for MICROPYINSPECT environment
 variable.

This adds support for a MICROPYINSPECT environment variable that works
exactly like PYTHONINSPECT; per CPython docs:

    If this is set to a non-empty string it is equivalent to specifying the
    -i option.

    This variable can also be modified by Python code using os.environ to
    force inspect mode on program termination.
---
 ports/unix/main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ports/unix/main.c b/ports/unix/main.c
index e129154544..deda8eb708 100644
--- a/ports/unix/main.c
+++ b/ports/unix/main.c
@@ -647,6 +647,10 @@ MP_NOINLINE int main_(int argc, char **argv) {
         }
     }
 
+    const char *inspect_env = getenv("MICROPYINSPECT");
+    if (inspect_env && inspect_env[0] != '\0') {
+        inspect = true;
+    }
     if (ret == NOTHING_EXECUTED || inspect) {
         if (isatty(0)) {
             prompt_read_history();