feat(userspace/apps/usr): stub implementation for mdview

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Fennix Userspace.code-workspace

@@ -18,7 +18,8 @@
 			"userspace/libs/libm",
 			"devcontainer",
 			"userspace/libs",
-			"userspace/apps/test"
+			"userspace/apps/test",
+			"userspace/apps/usr"
 		]
 	}
 }

Userspace/apps/usr/Makefile

@@ -0,0 +1,9 @@
+MAKE_TARGETS := build clean
+DIRECTORIES := $(sort $(dir $(wildcard ./*/)))
+
+.PHONY: $(MAKE_TARGETS) $(DIRECTORIES)
+
+$(MAKE_TARGETS): $(DIRECTORIES)
+
+$(DIRECTORIES):
+	$(MAKE) -C $@ $(MAKECMDGOALS)

Userspace/apps/usr/mdview/Makefile

@@ -0,0 +1,33 @@
+default:
+	$(error Do not run this Makefile directly!)
+
+S_SOURCES = $(shell find ./ -type f -name '*.S')
+C_SOURCES = $(shell find ./ -type f -name '*.c')
+CXX_SOURCES = $(shell find ./ -type f -name '*.cpp')
+
+OBJ = $(S_SOURCES:.S=.o) $(C_SOURCES:.c=.o) $(CXX_SOURCES:.cpp=.o)
+
+FILENAME = $(notdir $(shell pwd))
+WARNCFLAG = -Wall -Wextra
+
+build: $(FILENAME).elf
+	cp $(FILENAME).elf $(WORKSPACE_DIR)/out/usr/bin/$(FILENAME)
+
+$(FILENAME).elf: $(OBJ)
+	$(info Linking $@)
+	$(CC) $(LDFLAGS) $(SYSROOT) $(OBJ) -o $@
+
+%.o: %.c $(HEADERS)
+	$(info Compiling $<)
+	$(CC) $(CFLAGS) $(WARNCFLAG) -std=c17 -c $< -o $@
+
+%.o: %.cpp $(HEADERS)
+	$(info Compiling $<)
+	$(CXX) $(CFLAGS) $(WARNCFLAG) -std=c++20 -fexceptions -c $< -o $@ -fno-rtti
+
+%.o: %.S
+	$(info Compiling $<)
+	$(AS) -o $@ $<
+
+clean:
+	rm -f $(OBJ) $(FILENAME).elf

Userspace/apps/usr/mdview/mdview.c

@@ -0,0 +1,419 @@
+/*
+	This file is part of Fennix Userspace.
+
+	Fennix Userspace is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Userspace is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Userspace. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#define ANSI_COLOR_RED "\x1b[31m"
+#define ANSI_COLOR_GREEN "\x1b[32m"
+#define ANSI_COLOR_YELLOW "\x1b[33m"
+#define ANSI_COLOR_BLUE "\x1b[34m"
+#define ANSI_COLOR_MAGENTA "\x1b[35m"
+#define ANSI_COLOR_CYAN "\x1b[36m"
+#define ANSI_COLOR_WHITE "\x1b[37m"
+#define ANSI_COLOR_BLACK "\x1b[30m"
+#define ANSI_COLOR_RESET "\x1b[0m"
+
+#define ANSI_BG_BLACK "\x1b[40m"
+#define ANSI_BG_RED "\x1b[41m"
+#define ANSI_BG_GREEN "\x1b[42m"
+#define ANSI_BG_YELLOW "\x1b[43m"
+#define ANSI_BG_BLUE "\x1b[44m"
+#define ANSI_BG_MAGENTA "\x1b[45m"
+#define ANSI_BG_CYAN "\x1b[46m"
+#define ANSI_BG_GRAY "\x1b[47m"
+#define ANSI_BG_DARK_GRAY "\x1b[100m"
+
+#define ANSI_BOLD "\x1b[1m"
+#define ANSI_UNDERLINE "\x1b[4m"
+#define ANSI_STRIKETHROUGH "\x1b[9m"
+#define ANSI_HIGHLIGHT "\x1b[43m"
+
+void print_horizontal_rule()
+{
+	int width;
+	struct winsize ws;
+	ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
+	width = ws.ws_col;
+	for (int i = 0; i < width - 2; i++)
+		printf("-");
+}
+
+void print_admonition(const char *type, const char *title, const char *content)
+{
+	if (strcmp(type, "warning") == 0)
+	{
+		printf(ANSI_BG_YELLOW);
+		printf(ANSI_COLOR_BLACK);
+		printf("! Warning: %s %s\n", title, content);
+	}
+	else if (strcmp(type, "note") == 0)
+	{
+		printf(ANSI_BG_BLUE);
+		printf(ANSI_COLOR_WHITE);
+		printf("i Note: %s %s\n", title, content);
+	}
+	else if (strcmp(type, "tip") == 0)
+	{
+		printf(ANSI_BG_GREEN);
+		printf(ANSI_COLOR_WHITE);
+		printf("? Tip: %s %s\n", title, content);
+	}
+	else if (strcmp(type, "important") == 0)
+	{
+		printf(ANSI_BG_RED);
+		printf(ANSI_COLOR_BLACK);
+		printf("! Important: %s %s\n", title, content);
+	}
+	else if (strcmp(type, "caution") == 0)
+	{
+		printf(ANSI_BG_MAGENTA);
+		printf(ANSI_COLOR_WHITE);
+		printf("! Caution: %s %s\n", title, content);
+	}
+	else if (strcmp(type, "danger") == 0)
+	{
+		printf(ANSI_BG_RED);
+		printf(ANSI_COLOR_BLACK);
+		printf("! Danger: %s %s\n", title, content);
+	}
+	printf(ANSI_COLOR_RESET);
+}
+
+void print_formatted_text(const char *text)
+{
+	bool bold = false;
+	bool underline = false;
+	bool inline_code = false;
+	bool strikethrough = false;
+	bool highlight = false;
+
+	for (int i = 0; text[i] != '\0'; ++i)
+	{
+		if (strncmp(&text[i], "!!!", 3) == 0)
+		{
+			char admonition_type[20] = "";
+			char admonition_title[256] = "";
+			int type_start = i + 4;
+			int type_end = -1;
+			int title_start = -1;
+			int title_end = -1;
+			int content_start = -1;
+
+			for (int j = type_start; text[j] != '\0' && text[j] != ' ' && text[j] != '"'; ++j)
+			{
+				type_end = j;
+			}
+			if (type_end != -1)
+			{
+				strncpy(admonition_type, &text[type_start], type_end - type_start + 1);
+				admonition_type[type_end - type_start + 1] = '\0';
+				i = type_end + 1;
+			}
+
+			if (text[i] == ' ' && text[i + 1] == '"')
+			{
+				title_start = i + 2;
+				for (int j = title_start; text[j] != '\0' && text[j] != '"'; ++j)
+				{
+					title_end = j;
+				}
+				if (title_end != -1)
+				{
+					strncpy(admonition_title, &text[title_start], title_end - title_start + 1);
+					admonition_title[title_end - title_start + 1] = '\0';
+					i = title_end + 1;
+				}
+			}
+
+			content_start = i + 1;
+			print_admonition(admonition_type, admonition_title, text + content_start);
+			return;
+		}
+
+		if (text[i] == '`')
+		{
+			if (!inline_code)
+			{
+				printf(ANSI_BG_MAGENTA);
+				printf(ANSI_UNDERLINE);
+				printf(ANSI_BOLD);
+				inline_code = true;
+			}
+			else
+			{
+				printf(ANSI_COLOR_RESET);
+				inline_code = false;
+			}
+		}
+		else if (text[i] == '*' && text[i + 1] == '*')
+		{
+			if (!bold)
+			{
+				printf(ANSI_BOLD);
+				bold = true;
+				i++;
+			}
+			else
+			{
+				printf(ANSI_COLOR_RESET);
+				bold = false;
+				i++;
+			}
+		}
+		else if (text[i] == '_' && text[i + 1] == '_')
+		{
+			if (!underline)
+			{
+				printf(ANSI_UNDERLINE);
+				underline = true;
+				i++;
+			}
+			else
+			{
+				printf(ANSI_COLOR_RESET);
+				underline = false;
+				i++;
+			}
+		}
+		else if (text[i] == '~' && text[i + 1] == '~')
+		{
+			if (!strikethrough)
+			{
+				printf(ANSI_STRIKETHROUGH);
+				strikethrough = true;
+				i++;
+			}
+			else
+			{
+				printf(ANSI_COLOR_RESET);
+				strikethrough = false;
+				i++;
+			}
+		}
+		else if (text[i] == '=' && text[i + 1] == '=')
+		{
+			if (!highlight)
+			{
+				printf(ANSI_HIGHLIGHT);
+				highlight = true;
+				i++;
+			}
+			else
+			{
+				printf(ANSI_COLOR_RESET);
+				highlight = false;
+				i++;
+			}
+		}
+		else if (text[i] == '[')
+		{
+			int start_link_text = i + 1;
+			int end_link_text = -1;
+			int start_link_url = -1;
+			int end_link_url = -1;
+
+			for (int j = start_link_text; text[j] != '\0'; ++j)
+			{
+				if (text[j] == ']')
+				{
+					end_link_text = j;
+					if (text[j + 1] == '(')
+					{
+						start_link_url = j + 2;
+
+						for (int k = start_link_url; text[k] != '\0'; ++k)
+						{
+							if (text[k] == ')')
+							{
+								end_link_url = k;
+								break;
+							}
+						}
+					}
+					break;
+				}
+			}
+
+			if (end_link_text != -1 && start_link_url != -1 && end_link_url != -1)
+			{
+
+				char link_text[256];
+				strncpy(link_text, &text[start_link_text], end_link_text - start_link_text);
+				link_text[end_link_text - start_link_text] = '\0';
+
+				char link_url[256];
+				strncpy(link_url, &text[start_link_url], end_link_url - start_link_url);
+				link_url[end_link_url - start_link_url] = '\0';
+
+				printf(ANSI_UNDERLINE);
+				printf(link_text);
+				printf(ANSI_COLOR_RESET);
+				printf("(%s)", link_url);
+				i = end_link_url;
+				continue;
+			}
+		}
+		else if (text[i] == '<')
+		{
+			while (text[i] != '\0' && text[i] != '>')
+			{
+				i++;
+			}
+			if (text[i] == '>')
+			{
+				continue;
+			}
+		}
+		else if (strncmp(&text[i], "---\n", 4) == 0 || strncmp(&text[i], "***\n", 4) == 0 || strncmp(&text[i], "_________________\n", 18) == 0)
+		{
+			print_horizontal_rule();
+			i += 2;
+			continue;
+		}
+		else if (strncmp(&text[i], "- [x] ", 6) == 0)
+		{
+			printf("[X] ");
+			i += 5;
+			continue;
+		}
+		else if (strncmp(&text[i], "- [ ] ", 6) == 0)
+		{
+			printf("[ ] ");
+			i += 5;
+			continue;
+		}
+		else
+		{
+			printf("%c", text[i]);
+		}
+	}
+	printf(ANSI_COLOR_RESET);
+}
+
+void process_markdown_file(const char *filename)
+{
+	FILE *file = fopen(filename, "r");
+	if (file == NULL)
+	{
+		perror("fopen");
+		return;
+	}
+
+	char *line = NULL;
+	size_t len = 0;
+	ssize_t read;
+
+	while ((read = getline(&line, &len, file)) != -1)
+	{
+		if (strncmp(line, "# ", 2) == 0)
+		{
+			printf(ANSI_BOLD);
+			printf(ANSI_UNDERLINE);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "## ", 3) == 0)
+		{
+			printf(ANSI_BOLD);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "### ", 4) == 0)
+		{
+			printf(ANSI_UNDERLINE);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "#### ", 5) == 0)
+		{
+			printf(ANSI_BOLD);
+			printf(ANSI_UNDERLINE);
+			printf(ANSI_COLOR_RED);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "##### ", 6) == 0)
+		{
+			printf(ANSI_BOLD);
+			printf(ANSI_COLOR_MAGENTA);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "###### ", 7) == 0)
+		{
+			printf(ANSI_UNDERLINE);
+			printf(ANSI_COLOR_BLUE);
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "```", 3) == 0)
+		{
+			printf(ANSI_BG_DARK_GRAY);
+			printf(ANSI_COLOR_WHITE);
+			printf("%s", line);
+			while ((read = getline(&line, &len, file)) != -1 && strncmp(line, "```", 3) != 0)
+			{
+				printf("%s", line);
+			}
+			printf("%s", line);
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, "> ", 2) == 0 && strncmp(line, ">> ", 3) != 0)
+		{
+			printf(ANSI_COLOR_WHITE);
+			printf(ANSI_BG_GRAY " " ANSI_BG_DARK_GRAY "%s", line + (strncmp(line, ">>", 2) == 0 ? 2 : 1));
+			printf(ANSI_COLOR_RESET);
+		}
+		else if (strncmp(line, ">\n", 2) == 0)
+		{
+			printf(ANSI_COLOR_WHITE);
+			printf(ANSI_BG_GRAY " \n");
+			printf(ANSI_COLOR_RESET);
+		}
+		else
+		{
+			print_formatted_text(line);
+		}
+	}
+
+	fclose(file);
+	if (line)
+		free(line);
+}
+
+void print_usage()
+{
+	printf("Usage: mdview <markdown_file>\n");
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+	{
+		fprintf(stderr, "mdview: invalid arguments\n");
+		print_usage();
+		exit(EXIT_FAILURE);
+	}
+
+	process_markdown_file(argv[1]);
+	return 0;
+}

Userspace/apps/usr/mdview/test.md

@@ -0,0 +1,436 @@
+## Admonitions
+
+> :warning: **Warning:** This is a warning.
+
+> :memo: **Note:** This is a note.
+
+> :bulb: **Tip:** This is a tip.
+
+## GitHub Admonitions
+
+> [!NOTE]
+> This is a note.
+
+> [!TIP]
+> This is a tip.
+
+> [!IMPORTANT]
+> This is important.
+
+> [!WARNING]
+> This is a warning.
+
+> [!CAUTION]
+> This is a caution.
+
+## python-markdown Admonitions
+
+!!! note "This is a note."
+	Hello World!
+
+!!! danger "This is a danger."
+	Hello World!
+
+!!! important "This is important."
+	Hello World!
+
+!!! warning "This is a warning."
+	Hello World!
+
+!!! caution "This is a caution."
+	Hello World!
+
+[The section below is an excerpt of the original.](https://www.markdownguide.org/cheat-sheet/)
+The original content is licensed under a CC BY-SA 4.0 license. The original content can be found at the link above.
+
+## Headings
+
+# Heading level 1
+## Heading level 2
+### Heading level 3
+#### Heading level 4
+##### Heading level 5
+###### Heading level 6
+
+## Alternate Syntax
+
+Heading level 1
+===============
+
+Heading level 2
+---------------
+
+---
+
+## Paragraphs
+
+I really like using Markdown.
+
+I think I'll use it to format all of my documents from now on. 
+
+---
+
+## Line Breaks
+
+This is the first line.  
+And this is the second line.
+
+---
+
+## Emphasis
+
+I just love **bold text**.
+
+I just love __bold text__.
+
+Love**is**bold
+
+Italicized text is the *cat's meow*.
+
+Italicized text is the _cat's meow_.
+
+A*cat*meow
+
+This text is ***really important***.
+
+This text is ___really important___.
+
+This text is __*really important*__.
+
+This text is **_really important_**.
+
+This is really***very***important text.
+
+---
+
+## Blockquotes
+
+> Dorothy followed her through many of the beautiful rooms in her castle.
+
+> Dorothy followed her through many of the beautiful rooms in her castle.
+>
+> The Witch bade her clean the pots and kettles and sweep the floor and keep the fire fed with wood.
+
+> Dorothy followed her through many of the beautiful rooms in her castle.
+>
+>> The Witch bade her clean the pots and kettles and sweep the floor and keep the fire fed with wood.
+
+> #### The quarterly results look great!
+>
+> - Revenue was off the chart.
+> - Profits were higher than ever.
+>
+>  *Everything* is going according to **plan**.
+
+---
+
+## Lists
+
+List 1
+
+1. First item
+2. Second item
+3. Third item
+4. Fourth item
+
+List 2
+
+1. First item
+1. Second item
+1. Third item
+1. Fourth item
+
+List 3
+
+1. First item
+8. Second item
+3. Third item
+5. Fourth item
+
+List 4
+
+1. First item
+2. Second item
+3. Third item
+    1. Indented item
+    2. Indented item
+4. Fourth item
+
+List 5
+
+- First item
+- Second item
+- Third item
+- Fourth item
+
+List 6
+
+* First item
+* Second item
+* Third item
+* Fourth item
+
+List 7
+
++ First item
++ Second item
++ Third item
++ Fourth item
+
+List 8
+
+- First item
+- Second item
+- Third item
+    - Indented item
+    - Indented item
+- Fourth item
+
+List 9
+
+- 1968\. A great year!
+- I think 1969 was second best.
+
+---
+
+## Paragraphs
+
+* This is the first list item.
+* Here's the second list item.
+
+    I need to add another paragraph below the second list item.
+
+* And here's the third list item.
+
+* This is the first list item.
+* Here's the second list item.
+
+    > A blockquote would look great below the second list item.
+
+* And here's the third list item.
+
+---
+
+## Code Blocks
+
+1. Open the file.
+2. Find the following code block on line 21:
+
+        <html>
+          <head>
+            <title>Test</title>
+          </head>
+
+3. Update the title to match the name of your website.
+
+---
+
+## Images
+
+1. Open the file containing the Linux mascot.
+2. Marvel at its beauty.
+
+    ![Tux, the Linux mascot](https://mdg.imgix.net/assets/images/tux.png)
+
+3. Close the file.
+
+---
+
+## Code
+
+At the command prompt, type `nano`.
+
+``Use `code` in your Markdown file.``
+
+    <html>
+      <head>
+      </head>
+    </html>
+
+---
+
+## Horizontal Rules
+
+***
+
+---
+
+_________________
+
+---
+
+## Links
+
+My favorite search engine is [Duck Duck Go](https://duckduckgo.com).
+
+My favorite search engine is [Duck Duck Go](https://duckduckgo.com "The best search engine for privacy").
+
+<https://www.markdownguide.org>
+
+<fake@example.com>
+
+I love supporting the **[EFF](https://eff.org)**.
+
+This is the *[Markdown Guide](https://www.markdownguide.org)*.
+
+See the section on [`code`](#code).
+
+In a hole in the ground there lived a hobbit. Not a nasty, dirty, wet hole, filled with the ends
+of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to
+eat: it was a [hobbit-hole][1], and that means comfort.
+
+[1]: <https://en.wikipedia.org/wiki/Hobbit#Lifestyle> "Hobbit lifestyles"
+
+---
+
+## Escaping Characters
+
+\* Without the backslash, this would be a bullet in an unordered list.
+
+\\ test
+
+\` test
+
+\* test
+
+\_ test
+
+\{ test
+
+\} test
+
+\[ test
+
+\] test
+
+\< test
+
+\> test
+
+\( test
+
+\) test
+
+\# test
+
+\+ test
+
+\- test
+
+\. test
+
+\! test
+
+\| test
+
+---
+
+## HTML
+
+This **word** is bold. This <em>word</em> is italic.
+
+## Tables
+
+| Syntax      | Description |
+| ----------- | ----------- |
+| Header      | Title       |
+| Paragraph   | Text        |
+
+| Syntax | Description |
+| --- | ----------- |
+| Header | Title |
+| Paragraph | Text |
+
+| Syntax      | Description | Test Text     |
+| :---        |    :----:   |          ---: |
+| Header      | Title       | Here's this   |
+| Paragraph   | Text        | And more      |
+
+---
+
+## Fenced Code Blocks
+
+```
+{
+  "firstName": "John",
+  "lastName": "Smith",
+  "age": 25
+}
+```
+
+```json
+{
+  "firstName": "John",
+  "lastName": "Smith",
+  "age": 25
+}
+```
+
+---
+
+## Footnotes
+
+Here's a simple footnote,[^1] and here's a longer one.[^bignote]
+
+[^1]: This is the first footnote.
+
+[^bignote]: Here's one with multiple paragraphs and code.
+
+    Indent paragraphs to include them in the footnote.
+
+    `{ my code }`
+
+    Add as many paragraphs as you like.
+
+---
+
+## Heading IDs
+
+# Heading level 1 {#custom-id}
+## Heading level 2 {#custom-id}
+### Heading level 3 {#custom-id}
+#### Heading level 4 {#custom-id}
+##### Heading level 5 {#custom-id}
+###### Heading level 6 {#custom-id}
+
+---
+
+## Strikethrough
+
+~~The world is flat.~~ We now know that the world is round.
+
+---
+
+## Task Lists
+
+- [x] Write the press release
+- [ ] Update the website
+- [ ] Contact the media
+
+---
+
+## Emoji
+
+Gone camping! :tent: Be back soon.
+
+That is so funny! :joy:
+
+---
+
+## Highlight
+
+I need to highlight these ==very important words==.
+
+---
+
+## Subscript and Superscript
+
+H~2~O
+
+X^2^
+
+---
+
+## Disabling Automatic URL Linking
+
+`http://www.example.com`