From eb4048f4d179f2329d77827831af06da52947de9 Mon Sep 17 00:00:00 2001
From: Alex Karle <alex@alexkarle.com>
Date: Tue, 14 Dec 2021 00:35:12 -0500
Subject: [PATCH] Add initial version of blag, a simpler markup

This is most definitely buggy, but a repo's gotta start somewhere!
---
 blag.c | 227 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 227 insertions(+)
 create mode 100644 blag.c

diff --git a/blag.c b/blag.c
new file mode 100644
index 0000000..08d968c
--- /dev/null
+++ b/blag.c
@@ -0,0 +1,227 @@
+/*
+ * blag.c -- generate the blog!
+ *  ~akarle, MIT License
+ *
+ * "because markdown isn't in base!"
+ *
+ * Support:
+ * --------
+ *  #|##|### headers
+ *
+ *  <p> tags around paragraphs
+ *
+ *  * bullets (non-nested)
+ *
+ *  1. numerical lists (non-nested)
+ *
+ *  > quotes
+ *
+ *  TAB code blocks
+ *
+ *  Inline `code`
+ *
+ * TODO:
+ *  [[url|Links]]
+ *  -> if we see [[
+ *      -> print out <a href="
+ *  -> while in link
+ *      -> push into buf
+ *      -> putchar
+ *  -> if we see |
+ *      -> printf ">
+ *      -> just putchar
+ *  -> else
+ *      -> printf ">url
+ *  -> once we hit ]]
+ *      -> </a>
+ *
+ *  --> error reporting for unclosed links??
+ *      -> errx in closeblock() if in link parser
+ */
+#include <stdio.h>
+#include <err.h>
+#include <unistd.h>
+
+enum Block {
+    NONE,
+    HEADER_PARSE,
+    HEADER,
+    PARAGRAPH,
+    PARAGRAPH_BREAK,
+    CODE,
+    CODE_BREAK,
+    QUOTE,
+    QUOTE_BREAK,
+    ULIST,
+    ULIST_START,
+    ULIST_PARSE,
+    ULIST_BREAK,
+    OLIST,
+    OLIST_START,
+    OLIST_PARSE,
+    OLIST_BREAK,
+};
+
+int closeblock(int in, int hlvl) {
+    if (in == HEADER) {
+        in = NONE;
+        printf("</h%d>", hlvl);
+    } else if (in == PARAGRAPH) {
+        in = PARAGRAPH_BREAK;
+    } else if (in == PARAGRAPH_BREAK) {
+        in = NONE;
+        printf("</p>\n");
+    } else if (in == CODE) {
+        in = CODE_BREAK;
+    } else if (in == CODE_BREAK) {
+        in = NONE;
+        printf("</pre></code>\n");
+    } else if (in == QUOTE) {
+        in = QUOTE_BREAK;
+    } else if (in == QUOTE_BREAK) {
+        in = NONE;
+        printf("</blockquote>\n");
+    } else if (in == ULIST) {
+        in = ULIST_BREAK;
+        printf("</li>");
+    } else if (in == ULIST_BREAK) {
+        in = NONE;
+        printf("</ul>\n");
+    } else if (in == OLIST) {
+        in = OLIST_BREAK;
+        printf("</li>");
+    } else if (in == OLIST_BREAK) {
+        in = NONE;
+        printf("</ol>\n");
+    } else {
+        /* keep in as is */
+    }
+    return in;
+}
+
+int parse() {
+    /* Mini state machine */
+    int c;
+    enum Block in = NONE;
+    int hlvl = 0;
+    int in_code;
+    while ((c = getchar()) != EOF) {
+        switch (c) {
+            case '#':
+                if (in == NONE) {
+                    in = HEADER_PARSE;
+                    hlvl = 1;
+                } else if (in == HEADER_PARSE) {
+                    hlvl++;
+                }  else {
+                    /* not a special # */
+                    putchar(c);
+                }
+                break;
+            case ' ':
+                if (in == HEADER_PARSE) {
+                    printf("</h%d>", hlvl);
+                    in = HEADER;
+                } else if (in == ULIST_START) {
+                    printf("<ul>\n  <li>");
+                    in = ULIST;
+                } else if (in == ULIST_PARSE) {
+                    printf("  <li>");
+                    in = ULIST;
+                } else if (in == OLIST_START) {
+                    printf("<ol>\n  <li>");
+                    in = OLIST;
+                } else if (in == OLIST_PARSE) {
+                    printf("  <li>");
+                    in = OLIST;
+                } else if (in == NONE || in == OLIST_BREAK || in == ULIST_BREAK) {
+                    /* no op */
+                } else {
+                    putchar(c);
+                }
+                break;
+            case '`':
+                if (in_code) {
+                    printf("</code>");
+                    in_code = 0;
+                } else {
+                    printf("<code>");
+                    in_code = 1;
+                }
+                break;
+            case '\t':
+                if (in == NONE) {
+                    in = CODE;
+                    printf("<code><pre>\n");
+                } else if (in == CODE_BREAK) {
+                    in = CODE;
+                }
+                break;
+            case '>':
+                if (in == NONE) {
+                    in = QUOTE;
+                    printf("<blockquote>\n");
+                } else if (in == QUOTE_BREAK) {
+                    in = QUOTE;
+                }
+                break;
+            case '*':
+                if (in == NONE) {
+                    in = ULIST_START;
+                } else if (in == ULIST_START || in == ULIST_PARSE) {
+                    /* no op */
+                } else if (in == ULIST_BREAK) {
+                    /* next list item */
+                    in = ULIST_PARSE;
+                } else {
+                    putchar(c);
+                }
+                break;
+            case '1':
+            case '2':
+            case '3':
+            case '4':
+            case '5':
+            case '6':
+            case '7':
+            case '8':
+            case '9':
+            case '.':
+                if (in == NONE) {
+                    in = OLIST_START;
+                } else if (in == OLIST_START || in == OLIST_PARSE) {
+                    /* no op */
+                } else if (in == OLIST_BREAK) {
+                    /* next list item */
+                    in = OLIST_PARSE;
+                } else {
+                    putchar(c);
+                }
+                break;
+            case '\n':
+                in = closeblock(in, hlvl);
+                putchar(c);
+                break;
+            default:
+                if (in == NONE) {
+                    /* nothing else was matched -> assume new <p> */
+                    in = PARAGRAPH;
+                    printf("<p>\n");
+                } else if (in == PARAGRAPH_BREAK) {
+                    /* We thought it might be the end, but it aint! */
+                    in = PARAGRAPH;
+                }
+                putchar(c);
+                break;
+        }
+    }
+    closeblock(in, hlvl);
+    return 0;
+}
+
+int main(void) {
+#ifdef __OpenBSD__
+    pledge("stdio", "stdio");
+#endif
+    return parse();
+}
--
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