From 0d88411edd92814279dfe909db52700b4ca8e81d Mon Sep 17 00:00:00 2001
From: Alex Huszagh <ahuszagh@gmail.com>
Date: Sat, 21 Sep 2024 14:50:51 -0500
Subject: [PATCH] Disallow I/O methods via clippy.

Use clippy lints to disallow macros like `println!`, etc., and other
diagnostic macros and/or tools, or those that use general I/O.
---
 clippy.toml                   | 17 +++++++++++++++++
 lexical-asm/clippy.toml       |  2 +-
 lexical-benchmark/clippy.toml |  2 +-
 lexical-size/clippy.toml      |  2 +-
 4 files changed, 20 insertions(+), 3 deletions(-)
 mode change 120000 => 100644 lexical-asm/clippy.toml
 mode change 120000 => 100644 lexical-benchmark/clippy.toml
 mode change 120000 => 100644 lexical-size/clippy.toml

diff --git a/clippy.toml b/clippy.toml
index cda8d17e..fac585ae 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1 +1,18 @@
 avoid-breaking-exported-api = false
+disallowed-macros = [
+    # Can also use an inline table with a `path` key.
+    { path = "std::print", reason = "no IO allowed" },
+    { path = "std::println", reason = "no IO allowed" },
+    { path = "std::format", reason = "no string allocation allowed" },
+    { path = "std::debug", reason = "debugging macros should not be present in any release" },
+]
+disallowed-methods = [
+    { path = "std::io::stdout", reason = "no IO allowed" },
+    { path = "std::io::stdin", reason = "no IO allowed" },
+    { path = "std::io::stderr", reason = "no IO allowed" },
+]
+disallowed-types = [
+    { path = "std::io::File", reason = "no IO allowed" },
+    { path = "std::io::BufReader", reason = "need our own abstractions for reading/writing" },
+    { path = "std::io::BufWriter", reason = "need our own abstractions for reading/writing" },
+]
diff --git a/lexical-asm/clippy.toml b/lexical-asm/clippy.toml
deleted file mode 120000
index 85f6167c..00000000
--- a/lexical-asm/clippy.toml
+++ /dev/null
@@ -1 +0,0 @@
-../clippy.toml
\ No newline at end of file
diff --git a/lexical-asm/clippy.toml b/lexical-asm/clippy.toml
new file mode 100644
index 00000000..cda8d17e
--- /dev/null
+++ b/lexical-asm/clippy.toml
@@ -0,0 +1 @@
+avoid-breaking-exported-api = false
diff --git a/lexical-benchmark/clippy.toml b/lexical-benchmark/clippy.toml
deleted file mode 120000
index 85f6167c..00000000
--- a/lexical-benchmark/clippy.toml
+++ /dev/null
@@ -1 +0,0 @@
-../clippy.toml
\ No newline at end of file
diff --git a/lexical-benchmark/clippy.toml b/lexical-benchmark/clippy.toml
new file mode 100644
index 00000000..cda8d17e
--- /dev/null
+++ b/lexical-benchmark/clippy.toml
@@ -0,0 +1 @@
+avoid-breaking-exported-api = false
diff --git a/lexical-size/clippy.toml b/lexical-size/clippy.toml
deleted file mode 120000
index 85f6167c..00000000
--- a/lexical-size/clippy.toml
+++ /dev/null
@@ -1 +0,0 @@
-../clippy.toml
\ No newline at end of file
diff --git a/lexical-size/clippy.toml b/lexical-size/clippy.toml
new file mode 100644
index 00000000..cda8d17e
--- /dev/null
+++ b/lexical-size/clippy.toml
@@ -0,0 +1 @@
+avoid-breaking-exported-api = false