From f059ce44cda9f5b97fec791bd8b0dd58ee94ab74 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 18 Oct 2022 10:22:41 +0300
Subject: feat: have Rust lib/files steps for verifying file contents dump it

When a step check that a file contents fulfills a requirement, write
it to stdout if it doesn't. This helps debug failing scenarios.

Sponsored-by: author
---
 subplotlib/src/steplibrary/files.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/subplotlib/src/steplibrary/files.rs b/subplotlib/src/steplibrary/files.rs
index 1a55f7a..09cde56 100644
--- a/subplotlib/src/steplibrary/files.rs
+++ b/subplotlib/src/steplibrary/files.rs
@@ -233,6 +233,7 @@ pub fn file_contains(context: &Datadir, filename: &str, data: &str) {
     let full_path = context.canonicalise_filename(filename)?;
     let body = fs::read_to_string(full_path)?;
     if !body.contains(data) {
+        println!("file {} contains:\n{}", filename, body);
         throw!("expected file content not found");
     }
 }
@@ -248,6 +249,7 @@ pub fn file_doesnt_contain(context: &Datadir, filename: &str, data: &str) {
     let full_path = context.canonicalise_filename(filename)?;
     let body = fs::read_to_string(full_path)?;
     if body.contains(data) {
+        println!("file {} contains:\n{}", filename, body);
         throw!("unexpected file content found");
     }
 }
@@ -265,6 +267,7 @@ pub fn file_matches_regex(context: &Datadir, filename: &str, regex: &str) {
     let regex = Regex::new(regex)?;
     let body = fs::read_to_string(full_path)?;
     if !regex.is_match(&body) {
+        println!("file {} contains:\n{}", filename, body);
         throw!("file content does not match given regex");
     }
 }
@@ -281,6 +284,16 @@ pub fn file_match(context: &Datadir, filename1: &str, filename2: &str) {
     let body1 = fs::read(full_path1)?;
     let body2 = fs::read(full_path2)?;
     if body1 != body2 {
+        println!(
+            "file {} contains:\n{}",
+            filename1,
+            String::from_utf8_lossy(&body1)
+        );
+        println!(
+            "file {} contains:\n{}",
+            filename2,
+            String::from_utf8_lossy(&body2)
+        );
         throw!("file contents do not match each other");
     }
 }
-- 
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