From b171f11982ca5d84f515f9acc9842a0aa8bd6ea2 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 21:59:31 +0100
Subject: [PATCH 1/9] create io

---
 src/io/io.cpp | 0
 src/io/io.hpp | 0
 2 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 src/io/io.cpp
 create mode 100644 src/io/io.hpp

diff --git a/src/io/io.cpp b/src/io/io.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/io/io.hpp b/src/io/io.hpp
new file mode 100644
index 0000000..e69de29

From 5fa62d64ee2b6e02a18e68e080c085c4a8f0de78 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:19:00 +0100
Subject: [PATCH 2/9] added io functionality

---
 src/io/io.cpp | 36 ++++++++++++++++++++++++++++++++++++
 src/io/io.hpp | 13 +++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/src/io/io.cpp b/src/io/io.cpp
index e69de29..444c436 100644
--- a/src/io/io.cpp
+++ b/src/io/io.cpp
@@ -0,0 +1,36 @@
+#include "io/io.hpp"
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+
+std::string read_file(const std::string &FILE_PATH) {
+  std::ifstream file(FILE_PATH);
+  if (!file) {
+    throw std::runtime_error("Error while opening file at " + FILE_PATH);
+  }
+  std::stringstream buffer;
+  buffer << file.rdbuf();
+
+  if (file.bad()) {
+    throw std::runtime_error("Error while reading file at " + FILE_PATH);
+  }
+
+  return buffer.str();
+}
+
+void write_file(const std::string &FILE_PATH, const std::string &CONTENT) {
+  std::ofstream out(FILE_PATH);
+  if (!out) {
+    throw std::runtime_error("Error while opening file for writing at " +
+                             FILE_PATH);
+  }
+
+  out << CONTENT;
+
+  if (!out) {
+    throw std::runtime_error("Error while writing to the " + FILE_PATH);
+  }
+
+  out.close();
+}
diff --git a/src/io/io.hpp b/src/io/io.hpp
index e69de29..a43df36 100644
--- a/src/io/io.hpp
+++ b/src/io/io.hpp
@@ -0,0 +1,13 @@
+#include <string>
+
+// @brief Read file from given path
+// @param FILE PATH Path to the file
+// @return File content
+// @throws std::runtime_error if any errors
+std::string read_file(const std::string &FILE_PATH);
+
+/// @brief Writes the given content into a file.
+/// @param FILE_PATH Path to the file to write.
+/// @param CONTENT Content to write into the file.
+/// @throws std::runtime_error if the file cannot be opened or written.
+void write_file(const std::string &FILE_PATH, const std::string &CONTENT);

From 1668cb85639c70137ba56f79ede3c08ea30a5e10 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:33:58 +0100
Subject: [PATCH 3/9] moved all the file operation logic into io module

---
 .../index/config.cpp.A68A2AE9FDFA8117.idx     | Bin 0 -> 1382 bytes
 .../index/config.hpp.C519F3A7E0A75094.idx     | Bin 0 -> 1040 bytes
 .../index/format.cpp.047FF551BC8DE01E.idx     | Bin 0 -> 1078 bytes
 .../index/main.cpp.AC604CCC20973D23.idx       | Bin 0 -> 436 bytes
 .../index/markdown.cpp.A5D40F1BF5766683.idx   | Bin 0 -> 3162 bytes
 .../index/markdown.hpp.66A7ABFD738DA42D.idx   | Bin 0 -> 1138 bytes
 src/config/config.cpp                         |   4 ++--
 src/config/config.hpp                         |   5 ++++-
 src/format/format.cpp                         |  19 ----------------
 src/markdown/markdown.cpp                     |  21 +++++++++---------
 10 files changed, 16 insertions(+), 33 deletions(-)
 create mode 100644 src/.cache/clangd/index/config.cpp.A68A2AE9FDFA8117.idx
 create mode 100644 src/.cache/clangd/index/config.hpp.C519F3A7E0A75094.idx
 create mode 100644 src/.cache/clangd/index/format.cpp.047FF551BC8DE01E.idx
 create mode 100644 src/.cache/clangd/index/main.cpp.AC604CCC20973D23.idx
 create mode 100644 src/.cache/clangd/index/markdown.cpp.A5D40F1BF5766683.idx
 create mode 100644 src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx

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diff --git a/src/config/config.cpp b/src/config/config.cpp
index 4deede6..37b7c6e 100644
--- a/src/config/config.cpp
+++ b/src/config/config.cpp
@@ -5,10 +5,10 @@
 #include <toml++/impl/parser.hpp>
 #include <toml++/toml.hpp>
 
-Config get_config(const std::string &CONFIG_FILE) {
+Config get_config(const std::string &CONFIGURATION) {
   toml::table toml_table;
   try {
-    toml_table = toml::parse_file(CONFIG_FILE);
+    toml_table = toml::parse(CONFIGURATION);
   } catch (const toml::parse_error &err) {
     std::cerr << "Parsing failed:" << std::endl << err << std::endl;
   }
diff --git a/src/config/config.hpp b/src/config/config.hpp
index 30e25ee..1c40f89 100644
--- a/src/config/config.hpp
+++ b/src/config/config.hpp
@@ -17,4 +17,7 @@ struct Config {
   General general;
 };
 
-Config get_config(const std::string &CONFIG_FILE);
+// @brief Load config into `Config` struct
+// @param CONFIGURATION content of `.toml` file containing configuration
+// @return Config with parsed configuration
+Config get_config(const std::string &CONFIGURATION);
diff --git a/src/format/format.cpp b/src/format/format.cpp
index 5bf4f23..68516de 100644
--- a/src/format/format.cpp
+++ b/src/format/format.cpp
@@ -1,6 +1,4 @@
 #include "markdown/markdown.hpp"
-#include <fstream>
-#include <sstream>
 #include <string>
 
 static bool replace_once(std::string &str, const std::string &from,
@@ -11,20 +9,3 @@ static bool replace_once(std::string &str, const std::string &from,
   str.replace(start_pos, from.length(), to);
   return true;
 }
-
-std::string inject_html_into_template(const std::string &FILE_NAME,
-                                      const std::string &TEMPLATE,
-                                      const std::string &HTML) {
-  std::string result;
-  std::ifstream file(FILE_NAME);
-  if (!file.is_open()) {
-    return "";
-  }
-  std::ostringstream ss;
-  ss << file.rdbuf();
-  result = ss.str();
-  if (replace_once(result, TEMPLATE, HTML)) {
-    return result;
-  }
-  return "";
-}
diff --git a/src/markdown/markdown.cpp b/src/markdown/markdown.cpp
index 34bf0c5..81790c5 100644
--- a/src/markdown/markdown.cpp
+++ b/src/markdown/markdown.cpp
@@ -1,6 +1,5 @@
 #include "markdown.hpp"
 #include <ctime>
-#include <fstream>
 #include <iostream>
 #include <map>
 #include <md4c-html.h>
@@ -8,21 +7,21 @@
 #include <sstream>
 #include <toml++/toml.hpp>
 
-std::optional<Metadata> get_metadata(const std::string &FILE_PATH) {
-  std::fstream file(FILE_PATH);
+std::optional<Metadata> get_metadata(const std::string &FILE_CONTENTS) {
+  std::stringstream file_contents(FILE_CONTENTS);
   std::stringstream metadata_s;
   std::string buffer;
 
   /* if there's no ---, then no metadata in file there is */
-  if (!getline(file, buffer) || buffer != "---") {
-    std::cerr << "File " << FILE_PATH << " does not contain metadata. "
+  if (!getline(file_contents, buffer) || buffer != "---") {
+    std::clog << "File does not contain any metadata. Is this intentional?"
               << std::endl;
     return std::nullopt;
   }
 
   std::map<std::string, std::string> metadata_map;
 
-  while (getline(file, buffer)) {
+  while (getline(file_contents, buffer)) {
     if (buffer == "---") {
       break;
     }
@@ -69,15 +68,15 @@ static void html_callback(const MD_CHAR *data, MD_SIZE size, void *userdata) {
   out->append(data, size);
 }
 
-std::string get_html(const std::string &FILE_PATH) {
-  std::fstream file(FILE_PATH);
+std::string get_html(const std::string &FILE_CONTENTS) {
+  std::stringstream file_contents(FILE_CONTENTS);
   std::string buffer, file_string, out;
-  getline(file, buffer);
+  getline(file_contents, buffer);
   bool is_metadata = buffer == "---";
 
   /* skip metadata */
   if (is_metadata) {
-    while (getline(file, buffer)) {
+    while (getline(file_contents, buffer)) {
       if (buffer == "---") {
         break;
       }
@@ -86,7 +85,7 @@ std::string get_html(const std::string &FILE_PATH) {
     file_string += buffer + '\n';
   }
 
-  while (getline(file, buffer)) {
+  while (getline(file_contents, buffer)) {
     file_string += buffer + '\n';
   }
 

From 763761ea8293d240a5ec03c62b5c72cd651d6345 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:34:20 +0100
Subject: [PATCH 4/9] removed cache

---
 .../clangd/index/config.cpp.A68A2AE9FDFA8117.idx | Bin 1382 -> 0 bytes
 .../clangd/index/config.hpp.C519F3A7E0A75094.idx | Bin 1040 -> 0 bytes
 .../clangd/index/format.cpp.047FF551BC8DE01E.idx | Bin 1078 -> 0 bytes
 .../clangd/index/main.cpp.AC604CCC20973D23.idx   | Bin 436 -> 0 bytes
 .../index/markdown.cpp.A5D40F1BF5766683.idx      | Bin 3162 -> 0 bytes
 .../index/markdown.hpp.66A7ABFD738DA42D.idx      | Bin 1138 -> 0 bytes
 6 files changed, 0 insertions(+), 0 deletions(-)
 delete mode 100644 src/.cache/clangd/index/config.cpp.A68A2AE9FDFA8117.idx
 delete mode 100644 src/.cache/clangd/index/config.hpp.C519F3A7E0A75094.idx
 delete mode 100644 src/.cache/clangd/index/format.cpp.047FF551BC8DE01E.idx
 delete mode 100644 src/.cache/clangd/index/main.cpp.AC604CCC20973D23.idx
 delete mode 100644 src/.cache/clangd/index/markdown.cpp.A5D40F1BF5766683.idx
 delete mode 100644 src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx

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From 74b46f492393a061b4aa2495fb5e147a29d6b2f4 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:34:47 +0100
Subject: [PATCH 5/9] added cache to .gitignore

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index c528bab..5a81c0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@ posts/
 src/build/
 /src/blog
 /src/tests
+/src/cache/
 *.o

From bc9228cdc7e367a84b83266f7d8ea65c539ed65f Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:51:57 +0100
Subject: [PATCH 6/9] change test to take into account new io system

---
 .github/workflows/c-cpp.yml                   |  10 +-
 .gitignore                                    |   2 +-
 .../index/config.cpp.A68A2AE9FDFA8117.idx     | Bin 0 -> 1464 bytes
 .../index/config.hpp.C519F3A7E0A75094.idx     | Bin 0 -> 1118 bytes
 .../index/format.cpp.047FF551BC8DE01E.idx     | Bin 0 -> 604 bytes
 .../index/main.cpp.AC604CCC20973D23.idx       | Bin 0 -> 436 bytes
 .../index/markdown.cpp.A5D40F1BF5766683.idx   | Bin 0 -> 3110 bytes
 .../index/markdown.hpp.66A7ABFD738DA42D.idx   | Bin 0 -> 1138 bytes
 src/tests.cpp                                 | 104 +++++++++++++-----
 9 files changed, 82 insertions(+), 34 deletions(-)
 create mode 100644 src/.cache/clangd/index/config.cpp.A68A2AE9FDFA8117.idx
 create mode 100644 src/.cache/clangd/index/config.hpp.C519F3A7E0A75094.idx
 create mode 100644 src/.cache/clangd/index/format.cpp.047FF551BC8DE01E.idx
 create mode 100644 src/.cache/clangd/index/main.cpp.AC604CCC20973D23.idx
 create mode 100644 src/.cache/clangd/index/markdown.cpp.A5D40F1BF5766683.idx
 create mode 100644 src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx

diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 2f9e96c..3c64889 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -17,7 +17,9 @@ jobs:
       run: |
         sudo apt update
         sudo apt install -y g++ catch2 libmd4c-dev libmd4c-html0-dev libtomlplusplus-dev
-    - name: make
-      run: make -C src
-    - name: make check
-      run: make check -C src
+    - name: make all
+      run: make all
+    - name: make test
+      run: make test
+    - name: make clean
+      run: make clean
diff --git a/.gitignore b/.gitignore
index 5a81c0c..3b73a2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,5 @@ posts/
 src/build/
 /src/blog
 /src/tests
-/src/cache/
+/src/.cache/
 *.o
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diff --git a/src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx b/src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx
new file mode 100644
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diff --git a/src/tests.cpp b/src/tests.cpp
index b0eb144..9eace9e 100644
--- a/src/tests.cpp
+++ b/src/tests.cpp
@@ -7,10 +7,77 @@
 #include <optional>
 #include <string>
 
-TEST_CASE("Checking config file read", "[config]") {
-  const std::string FILE_NAME = "test_files/config.toml";
+namespace TestFiles {
+constexpr const char *config_toml = R"([general]
+    lang = "en"
+    title = "Blog"
 
-  Config config = get_config(FILE_NAME);
+    [contact]
+    author = "author"
+    email = "email@example.com"
+    signal = "signal url")";
+
+constexpr const char *formatter_html = R"(<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+</head>
+<body>
+    {{replace_me}}
+</body>
+</html>)";
+
+constexpr const char *no_metadata_post_md = R"(# This markdown has no metadata.
+That's bad. Don't do it. It's for tests only.)";
+
+constexpr const char *post_md = R"(---
+[metadata]
+author = "joseph"
+date = 2026-01-01
+title = "Example of a blog post"
+tags = ["blog", "test", "lalilulelo"]
+---
+# This is an example post
+
+In this example we will do a couple of cool markdown things.
+
+## This is a h2 header
+*This text is written in italic!*
+### Look at this!
+**This text is BOLD!**
+
+## Hello world!
+```cpp
+#include <iostream>
+
+int main() {
+    std::cout << "Hello world!" << std::endl;
+}
+```
+This is super cool!
+
+## Time to link some random website!
+This [should be clickable](https://example.com)
+
+## Image test
+![this should show an image](./image.png)
+
+## This is an ordered list
+1. one
+2. six
+3. seven
+
+## This is an unordered one
+- six
+- nine
+- six
+- nine)";
+} // namespace TestFiles
+
+TEST_CASE("Checking config file read", "[config]") {
+  Config config = get_config(TestFiles::config_toml);
 
   REQUIRE(config.contact.author == "author");
   REQUIRE(config.contact.email == "email@example.com");
@@ -20,8 +87,7 @@ TEST_CASE("Checking config file read", "[config]") {
 }
 
 TEST_CASE("get_metadata function data correctness test") {
-  const std::string FILE_NAME = "./test_files/post.md";
-  Metadata result = get_metadata(FILE_NAME).value();
+  Metadata result = get_metadata(TestFiles::post_md).value();
 
   std::string expected_author = "joseph";
   struct tm datetime = {0};
@@ -41,14 +107,13 @@ TEST_CASE("get_metadata function data correctness test") {
 }
 
 TEST_CASE("get_metadata function test with a file that doesn't have metadata") {
-  const std::string FILE_NAME = ".test_files/no_metadata_post.md";
-  std::optional<Metadata> result = get_metadata(FILE_NAME);
+  std::optional<Metadata> result = get_metadata(TestFiles::no_metadata_post_md);
   REQUIRE(result == std::nullopt);
 }
 
 TEST_CASE("get_html function parsing test") {
-  const std::string INPUT = "./test_files/post.md";
-  const std::string EXPECTED_OUTPUT = R"HTML(<h1>This is an example post</h1>
+  const std::string EXPECTED_OUTPUT =
+      R"HTML(<h1>This is an example post</h1>
 <p>In this example we will do a couple of cool markdown things.</p>
 <h2>This is a h2 header</h2>
 <p><em>This text is written in italic!</em></p>
@@ -81,24 +146,5 @@ int main() {
 </ul>
 )HTML";
 
-  REQUIRE(get_html(INPUT) == EXPECTED_OUTPUT);
-}
-
-TEST_CASE("formatter injection test") {
-  const std::string FILE_NAME = "./test_files/formatter.html";
-  const std::string EXPECTED_OUTPUT = R"(<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Document</title>
-</head>
-<body>
-    I'm replaced!
-</body>
-</html>
-)";
-  const std::string output =
-      inject_html_into_template(FILE_NAME, "{{replace_me}}", "I'm replaced!");
-  REQUIRE(EXPECTED_OUTPUT == output);
+  REQUIRE(get_html(TestFiles::post_md) == EXPECTED_OUTPUT);
 }

From 8556937f580180696677ca6a7b7f31643ba8657f Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:52:31 +0100
Subject: [PATCH 7/9] remove this annoying cache that i can't ignore for some
 reason

---
 .../clangd/index/config.cpp.A68A2AE9FDFA8117.idx | Bin 1464 -> 0 bytes
 .../clangd/index/config.hpp.C519F3A7E0A75094.idx | Bin 1118 -> 0 bytes
 .../clangd/index/format.cpp.047FF551BC8DE01E.idx | Bin 604 -> 0 bytes
 .../clangd/index/main.cpp.AC604CCC20973D23.idx   | Bin 436 -> 0 bytes
 .../index/markdown.cpp.A5D40F1BF5766683.idx      | Bin 3110 -> 0 bytes
 .../index/markdown.hpp.66A7ABFD738DA42D.idx      | Bin 1138 -> 0 bytes
 6 files changed, 0 insertions(+), 0 deletions(-)
 delete mode 100644 src/.cache/clangd/index/config.cpp.A68A2AE9FDFA8117.idx
 delete mode 100644 src/.cache/clangd/index/config.hpp.C519F3A7E0A75094.idx
 delete mode 100644 src/.cache/clangd/index/format.cpp.047FF551BC8DE01E.idx
 delete mode 100644 src/.cache/clangd/index/main.cpp.AC604CCC20973D23.idx
 delete mode 100644 src/.cache/clangd/index/markdown.cpp.A5D40F1BF5766683.idx
 delete mode 100644 src/.cache/clangd/index/markdown.hpp.66A7ABFD738DA42D.idx

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From eecadf4fab098cd9306e58165d253385c4f58c44 Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 22:53:38 +0100
Subject: [PATCH 8/9] updated makefile, adding new io module

---
 src/makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/makefile b/src/makefile
index d921679..fa8f076 100644
--- a/src/makefile
+++ b/src/makefile
@@ -8,14 +8,16 @@ BUILD_DIR = build
 SOURCES = main.cpp \
           config/config.cpp \
           format/format.cpp \
-          markdown/markdown.cpp
+          markdown/markdown.cpp \
+		  io/io.cpp
 
 OBJECTS = $(SOURCES:%.cpp=$(BUILD_DIR)/%.o)
 
 TEST_SOURCES = tests.cpp \
                config/config.cpp \
                format/format.cpp \
-               markdown/markdown.cpp
+               markdown/markdown.cpp \
+			   io/io.cpp
 
 TEST_OBJECTS = $(TEST_SOURCES:%.cpp=$(BUILD_DIR)/%.o)
 

From 858bd19f101ad5d13d6786ec8ead2dae2500c06e Mon Sep 17 00:00:00 2001
From: Szymon P <szymon_jozef@proton.me>
Date: Sun, 11 Jan 2026 23:02:19 +0100
Subject: [PATCH 9/9] added io tests

---
 src/tests.cpp | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/src/tests.cpp b/src/tests.cpp
index 9eace9e..e13575e 100644
--- a/src/tests.cpp
+++ b/src/tests.cpp
@@ -1,5 +1,6 @@
 #include "config/config.hpp"
 #include "format/format.hpp"
+#include "io/io.hpp"
 #include "markdown/markdown.hpp"
 #include <catch2/catch_all.hpp>
 #include <catch2/catch_test_macros.hpp>
@@ -9,13 +10,14 @@
 
 namespace TestFiles {
 constexpr const char *config_toml = R"([general]
-    lang = "en"
-    title = "Blog"
+lang = "en"
+title = "Blog"
 
-    [contact]
-    author = "author"
-    email = "email@example.com"
-    signal = "signal url")";
+[contact]
+author = "author"
+email = "email@example.com"
+signal = "signal url"
+)";
 
 constexpr const char *formatter_html = R"(<!DOCTYPE html>
 <html lang="en">
@@ -76,6 +78,16 @@ This [should be clickable](https://example.com)
 - nine)";
 } // namespace TestFiles
 
+// IO tests
+TEST_CASE("Test reading a file successful") {
+  std::string result = read_file("./test_files/config.toml");
+  REQUIRE(result == TestFiles::config_toml);
+}
+
+TEST_CASE("Test reading a file that doesn't exist") {
+  REQUIRE_THROWS(read_file("this/path/doesnt/exist"));
+}
+
 TEST_CASE("Checking config file read", "[config]") {
   Config config = get_config(TestFiles::config_toml);