feat(0.1.0): initial release0.1.0

17 files changed, 1629 insertions, 0 deletions

diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
new file mode 100644
index 0000000..c1d1f7a
--- /dev/null
+++ b/.github/workflows/check.yaml
@@ -0,0 +1,35 @@
+name: Check ✅
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "*"
+  pull_request:
+    paths:
+      - "*"
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛒
+        uses: actions/checkout@v3
+
+      - name: Toolchain 🧰
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          components: rustfmt, clippy
+          override: true
+
+      - name: Check ✅
+        uses: actions-rs/cargo@v1
+        continue-on-error: false
+        with:
+          command: check
+          args: --verbose
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..33adfcb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+# Rust
+target/
+Cargo.lock
+
+# IDE
+.idea/
diff --git a/.license_template b/.license_template
new file mode 100644
index 0000000..628cb72
--- /dev/null
+++ b/.license_template
@@ -0,0 +1,17 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) {20\d{2}(-20\d{2})?} Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) {20\d{2}(-20\d{2})?} Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..66723bd
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[package]
+name = "germ"
+version = "0.1.0"
+authors = ["Fuwn <[email protected]>"]
+edition = "2021"
+description = "The Ultimate Gemini Toolkit."
+documentation = "https://docs.rs/germ"
+readme = "README.md"
+homepage = "https://github.com/gemrest/germ"
+repository = "https://github.com/gemrest/germ"
+license = "GPL-3.0-only"
+keywords = ["gemini", "parser", "lexer", "markdown", "converter"]
+categories = ["encoding"]
+
+[features]
+ast = []
+convert = []
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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.
+
+    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile.toml b/Makefile.toml
new file mode 100644
index 0000000..b4967e3
--- /dev/null
+++ b/Makefile.toml
@@ -0,0 +1,26 @@
+# ------------
+# | Wrappers |
+# ------------
+[tasks.fmt]
+args = ["fmt"]
+command = "cargo"
+toolchain = "nightly"
+
+[tasks.check]
+args = ["check"]
+command = "cargo"
+
+[tasks.clippy]
+args = ["clippy"]
+command = "cargo"
+
+# -------------
+# | Executors |
+# -------------
+[tasks.checkf]
+dependencies = ["fmt", "check"]
+workspace = false
+
+[tasks.checkfc]
+dependencies = ["fmt", "check", "clippy"]
+workspace = false
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f4e512a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,44 @@
+# Germ
+
+[![crates.io](https://img.shields.io/crates/v/germ.svg)](https://crates.io/crates/germ)
+[![docs.rs](https://docs.rs/germ/badge.svg)](https://docs.rs/germ)
+[![github.com](https://github.com/gemrest/germ/actions/workflows/check.yaml/badge.svg?branch=main)](https://github.com/gemrest/germ/actions/workflows/check.yaml)
+
+The Ultimate Gemini Toolkit.
+
+Germ is a toolkit for the Gemini protocol which aims to have a little something
+for everyone. At the moment, Germ has **ZERO** dependencies, and Germ will
+continue to try its hardest to have as few dependencies as possible.
+
+## Features
+
+- AST builder to easily construct AST trees from raw Gemtext.
+- Converters to easily convert from Gemtext to markup formats such as HTML or
+  Markdown.
+- More to come!
+
+## Usage
+
+```toml
+# Cargo.toml
+
+[dependencies]
+germ = "0.1.0"
+```
+
+### Features
+
+| Feature   | Description                                                      |
+|-----------|------------------------------------------------------------------|
+| `ast`     | Construct AST trees from raw Gemtext.                            |
+| `convert` | Convert from Gemtext to markup formats such as HTML or Markdown. |
+
+### Examples
+
+Examples can be found within the
+[`examples/`](https://github.com/gemrest/germ/tree/main/examples) directory.
+
+## License
+
+This project is licensed with the
+[GNU General Public License v3.0](https://github.com/gemrest/germ/blob/main/LICENSE).
diff --git a/examples/ast.rs b/examples/ast.rs
new file mode 100644
index 0000000..cbc97d8
--- /dev/null
+++ b/examples/ast.rs
@@ -0,0 +1,52 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+const EXAMPLE_GEMTEXT: &str = r#"```This is alt-text
+Here goes the pre-formatted text.
+
+This continues the pre-formatted text on a new line after a blank line.
+```
+
+# This is a heading
+
+This is some text.
+
+This is more text after a blank line.
+
+* This is a single list item.
+* This is the next list item.
+
+* This is a new list.
+* This is the next item on the new list.
+
+## This is a sub-heading
+
+> This is a blockquote.
+
+### This is a sub-sub-heading.
+
+=> gemini://gem.rest/ This is a link to GemRest
+=> /somewhere
+
+That was a link without text."#;
+
+fn main() {
+  for node in germ::ast::build(EXAMPLE_GEMTEXT) {
+    println!("{:?}", node);
+  }
+}
diff --git a/examples/html.rs b/examples/html.rs
new file mode 100644
index 0000000..00d62ed
--- /dev/null
+++ b/examples/html.rs
@@ -0,0 +1,60 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+const EXAMPLE_GEMTEXT: &str = r#"```This is alt-text
+Here goes the pre-formatted text.
+
+This continues the pre-formatted text on a new line after a blank line.
+```
+
+# This is a heading
+
+This is some text.
+
+This is more text after a blank line.
+
+* This is a single list item.
+* This is the next list item.
+
+* This is a new list.
+* This is the next item on the new list.
+
+## This is a sub-heading
+
+> This is a blockquote.
+
+### This is a sub-sub-heading.
+
+=> gemini://gem.rest/ This is a link to GemRest
+=> /somewhere
+
+That was a link without text."#;
+
+fn main() {
+  println!(
+    "{}",
+    // germ::convert::convert_from_ast(
+    //   germ::ast::build(EXAMPLE_GEMTEXT),
+    //   germ::convert::Target::Markdown
+    // )
+    germ::convert::convert_from_string(
+      EXAMPLE_GEMTEXT,
+      germ::convert::Target::HTML,
+    ),
+  );
+}
diff --git a/examples/markdown.rs b/examples/markdown.rs
new file mode 100644
index 0000000..800717b
--- /dev/null
+++ b/examples/markdown.rs
@@ -0,0 +1,60 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+const EXAMPLE_GEMTEXT: &str = r#"```This is alt-text
+Here goes the pre-formatted text.
+
+This continues the pre-formatted text on a new line after a blank line.
+```
+
+# This is a heading
+
+This is some text.
+
+This is more text after a blank line.
+
+* This is a single list item.
+* This is the next list item.
+
+* This is a new list.
+* This is the next item on the new list.
+
+## This is a sub-heading
+
+> This is a blockquote.
+
+### This is a sub-sub-heading.
+
+=> gemini://gem.rest/ This is a link to GemRest
+=> /somewhere
+
+That was a link without text."#;
+
+fn main() {
+  println!(
+    "{}",
+    // germ::convert::convert_from_ast(
+    //   germ::ast::build(EXAMPLE_GEMTEXT),
+    //   germ::convert::Target::Markdown
+    // )
+    germ::convert::convert_from_string(
+      EXAMPLE_GEMTEXT,
+      germ::convert::Target::Markdown
+    ),
+  );
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..292fe49
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "stable"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..1dd4c90
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,30 @@
+condense_wildcard_suffixes = true
+edition = "2021"
+enum_discrim_align_threshold = 20
+# error_on_line_overflow = true
+# error_on_unformatted = true
+fn_single_line = true
+force_multiline_blocks = true
+format_code_in_doc_comments = true
+format_macro_matchers = true
+format_strings = true
+imports_layout = "HorizontalVertical"
+license_template_path = ".license_template"
+max_width = 80
+match_arm_blocks = false
+imports_granularity = "Crate"
+newline_style = "Unix"
+normalize_comments = true
+normalize_doc_attributes = true
+reorder_impl_items = true
+group_imports = "StdExternalCrate"
+reorder_modules = true
+report_fixme = "Always"
+# report_todo = "Always"
+struct_field_align_threshold = 20
+struct_lit_single_line = false
+tab_spaces = 2
+use_field_init_shorthand = true
+use_try_shorthand = true
+where_single_line = true
+wrap_comments = true
diff --git a/src/ast.rs b/src/ast.rs
new file mode 100644
index 0000000..69ad123
--- /dev/null
+++ b/src/ast.rs
@@ -0,0 +1,348 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+//! Build AST trees from Gemtext
+
+/// A Gemtext AST node.
+///
+/// Each Gemtext line is a `Node`, and some lines can even be grouped together,
+/// such as the `Node::List` `Node`!
+///
+/// # Gemtext Resources
+///
+/// - [Gemtext Documentation](https://gemini.circumlunar.space/docs/gemtext.gmi)
+/// - [Gemtext Cheatsheet](https://gemini.circumlunar.space/docs/cheatsheet.gmi).
+/// - [Gemini Specification](https://gemini.circumlunar.space/docs/specification.gmi).
+#[derive(Debug)]
+pub enum Node {
+  /// A text line
+  ///
+  /// # Example
+  ///
+  /// ```gemini
+  /// This is a text line
+  /// ```
+  Text(String),
+  /// A link line
+  ///
+  /// # Examples
+  ///
+  /// ```gemini
+  /// => /this-is-the-to This is the text
+  ///
+  /// => gemini://to.somewhere.link
+  /// ```
+  Link {
+    /// The location that a link line is pointing to
+    ///
+    /// # Examples
+    ///
+    /// ```gemini
+    /// => /this-is-the-to This is the text
+    ///
+    /// => gemini://to.somewhere.link
+    /// ```
+    to:   String,
+    /// The text a link line *may* have
+    ///
+    /// # Examples
+    ///
+    /// ```gemini
+    /// => /this-is-the-to This line has text, unlike the next one.
+    ///
+    /// => gemini://to.somewhere.link
+    /// ```
+    text: Option<String>,
+  },
+  /// A heading line
+  ///
+  /// # Examples
+  ///
+  /// ```gemini
+  /// # This is a heading
+  ///
+  /// ## This is a sub-heading
+  ///
+  /// ### This is a sub-sub-heading
+  /// ```
+  Heading {
+    /// The level of a heading
+    ///
+    /// # Examples
+    ///
+    /// ```gemini
+    /// # This is a level 1 heading
+    ///
+    /// ## This is a level 2 sub-heading
+    ///
+    /// ### This is a level 3 sub-sub-heading
+    /// ```
+    level: usize,
+    /// The text of a heading
+    ///
+    /// # Examples
+    ///
+    /// ```gemini
+    /// # This is the headings text
+    ///
+    /// # This is also the headings text
+    /// ```
+    text:  String,
+  },
+  /// A collection of sequential list item lines
+  ///
+  /// # Examples
+  ///
+  /// ```gemini
+  /// * These are
+  /// * sequential list
+  /// * items.
+  /// ```
+  List(Vec<String>),
+  /// A blockquote line
+  ///
+  /// # Examples
+  ///
+  /// ```gemini
+  /// > This is a blockquote line
+  ///
+  /// > This is also a blockquote line
+  /// ```
+  Blockquote(String),
+  /// A preformatted block
+  ///
+  /// # Examples
+  ///
+  /// Try to ignore the leading backslash in-front of the triple backticks,
+  /// they are there to not confuse the Markdown engine.
+  ///
+  /// ```gemini
+  /// \```This is the alt-text
+  /// This is the preformatted block
+  ///
+  /// This is the rest of the preformatted block
+  /// \```
+  /// ```
+  PreformattedText {
+    /// A preformatted blocks alt-text
+    ///
+    /// # Examples
+    ///
+    /// Try to ignore the leading backslash in-front of the triple backticks,
+    /// they are there to not confuse the Markdown engine.
+    ///
+    /// ```gemini
+    /// \```This is the alt-text
+    /// This is the preformatted block
+    ///
+    /// This is the rest of the preformatted block
+    /// \```
+    /// ```
+    alt_text: Option<String>,
+    /// A preformatted blocks content
+    ///
+    /// # Examples
+    ///
+    /// Try to ignore the leading backslash in-front of the triple backticks,
+    /// they are there to not confuse the Markdown engine.
+    ///
+    /// ```gemini
+    /// \```This is the alt-text
+    /// This is the preformatted blocks content
+    ///
+    /// This is the rest of the preformatted blocks content
+    /// \```
+    /// ```
+    text:     String,
+  },
+  /// A whitespace line, a line which contains nothing but whitespace.
+  Whitespace,
+}
+
+/// Build an AST tree from Gemtext.
+///
+/// # Example
+///
+/// ```rust
+/// germ::ast::build(r#"=> gemini://gem.rest/ GemRest"#); 
+/// ```
+#[must_use]
+pub fn build(source: &str) -> Vec<Node> {
+  let mut ast = vec![];
+  let mut in_preformatted = false;
+  let mut in_list = false;
+  let mut lines = source.lines();
+
+  // Iterate over all lines in the Gemtext `source`
+  while let Some(line) = lines.next() {
+    // Evaluate the Gemtext line and append its AST node to the `ast` tree
+    ast.append(&mut evaluate(
+      line,
+      &mut lines,
+      &mut in_preformatted,
+      &mut in_list,
+    ));
+  }
+
+  ast
+}
+
+fn evaluate(
+  line: &str,
+  lines: &mut std::str::Lines<'_>,
+  in_preformatted: &mut bool,
+  in_list: &mut bool,
+) -> Vec<Node> {
+  let mut preformatted = String::new();
+  let mut alt_text = String::new();
+  let mut nodes = vec![];
+  let mut line = line;
+  let mut list_items = vec![];
+
+  // Enter a not-so-infinite loop as sometimes, we may need to stay in an
+  // evaluation loop, e.g., multiline contexts: preformatted text, lists, etc.
+  loop {
+    // Match the first character of the Gemtext line to understand the line type
+    match line.get(0..1).unwrap_or("") {
+      "=" => {
+        // If the Gemtext line starts with an "=" ("=>"), it is a link line, so
+        // splitting it up should be easy enough.
+        let line = line.get(2..).unwrap();
+        let mut split = line
+          .split_whitespace()
+          .map(String::from)
+          .collect::<Vec<String>>()
+          .into_iter();
+
+        nodes.push(Node::Link {
+          to:   split.next().expect("no location in link"),
+          text: split.next(),
+        });
+
+        break;
+      }
+      "#" => {
+        // If the Gemtext line starts with an "#", it is a heading, so let's
+        // find out how deep it goes.
+        let level = match line.get(0..3) {
+          Some(root) =>
+            if root.contains("###") {
+              3
+            } else if root.contains("##") {
+              2
+            } else if root.contains('#') {
+              1
+            } else {
+              0
+            },
+          None => 0,
+        };
+
+        nodes.push(Node::Heading {
+          level,
+          // Here, we are `get`ing the `&str` starting at the `level`-th index,
+          // then trimming the start. These operations effectively off the line
+          // identifier.
+          text: line.get(level..).unwrap_or("").trim_start().to_string(),
+        });
+
+        break;
+      }
+      "*" => {
+        // If the Gemtext line starts with an asterisk, it is a list item, so
+        // let's enter a list context.
+        if !*in_list {
+          *in_list = true;
+        }
+
+        list_items.push(line.get(1..).unwrap_or("").trim_start().to_string());
+
+        line = lines.next().unwrap();
+      }
+      ">" => {
+        // If the Gemtext line starts with an ">", it is a blockquote, so let's
+        // just clip off the line identifier.
+        nodes.push(Node::Blockquote(
+          line.get(1..).unwrap_or("").trim_start().to_string(),
+        ));
+
+        break;
+      }
+      "`" => {
+        // If the Gemtext line starts with a backtick, it is a list item, so
+        // let's enter a preformatted text context.
+        *in_preformatted = !*in_preformatted;
+
+        if *in_preformatted {
+          alt_text = line.get(3..).unwrap_or("").to_string();
+          line = lines.next().unwrap();
+        } else {
+          nodes.push(Node::PreformattedText {
+            alt_text: if alt_text.is_empty() {
+              None
+            } else {
+              Some(alt_text)
+            },
+            text:     preformatted,
+          });
+
+          break;
+        }
+      }
+      "" if !*in_preformatted => {
+        // If the line has nothing on it, it is a whitespace line, as long as we
+        // aren't in a preformatted line context.
+        nodes.push(Node::Whitespace);
+
+        break;
+      }
+      // This as a catchall, it does a number of things.
+      _ =>
+        if *in_preformatted {
+          // If we are in a preformatted line context, add the line to the
+          // preformatted blocks content and increment the line.
+          preformatted.push_str(&format!("{}\n", line));
+
+          line = lines.next().unwrap();
+        } else {
+          // If we are in a list item and hit a catchall, that must mean that we
+          // encountered a line which is not a list line, so let's stop adding
+          // items to the list context.
+          if *in_list {
+            *in_list = false;
+
+            nodes.push(Node::Text(line.to_string()));
+
+            break;
+          }
+
+          nodes.push(Node::Text(line.to_string()));
+
+          break;
+        },
+    }
+  }
+
+  if !list_items.is_empty() {
+    nodes.reverse();
+    nodes.push(Node::List(list_items));
+    nodes.reverse();
+  }
+
+  nodes
+}
diff --git a/src/convert.rs b/src/convert.rs
new file mode 100644
index 0000000..6661d4f
--- /dev/null
+++ b/src/convert.rs
@@ -0,0 +1,68 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+//! Convert Gemtext into many types of markup.
+
+mod html;
+mod markdown;
+
+/// Different targets to convert Gemtext to
+pub enum Target {
+  /// Convert Gemtext to HTML
+  HTML,
+  /// Convert Gemtext to Markdown
+  Markdown,
+}
+
+/// Convert AST'd Gemtext into an alternative markup format.
+///
+/// # Example
+///
+/// ```rust
+/// use germ::convert;
+///
+/// convert::convert_from_ast(
+///   germ::ast::build(r#"=> gemini://gem.rest/ GemRest"#),
+///   convert::Target::HTML,
+/// );
+/// ```
+pub fn convert_from_ast(
+  source: Vec<crate::ast::Node>,
+  target: Target,
+) -> String {
+  match target {
+    Target::Markdown => markdown::convert(source),
+    Target::HTML => html::convert(source),
+  }
+}
+
+/// Convert raw Gemtext into an alternative markup format.
+///
+/// # Example
+///
+/// ```rust
+/// use germ::convert;
+///
+/// convert::convert_from_string(
+///   r#"=> gemini://gem.rest/ GemRest"#,
+///   convert::Target::HTML,
+/// );
+/// ```
+pub fn convert_from_string(source: &str, target: Target) -> String {
+  convert_from_ast(crate::ast::build(source), target)
+}
diff --git a/src/convert/html.rs b/src/convert/html.rs
new file mode 100644
index 0000000..18aec1e
--- /dev/null
+++ b/src/convert/html.rs
@@ -0,0 +1,75 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+use crate::ast::Node;
+
+pub fn convert(source: Vec<Node>) -> String {
+  let mut html = String::new();
+
+  // Since we have an AST tree of the Gemtext, it is very easy to convert from
+  // this AST tree to an alternative markup format.
+  for node in source {
+    match node {
+      Node::Text(text) => html.push_str(&format!("<p>{}</p>", text)),
+      Node::Link {
+        to,
+        text,
+      } => {
+        html.push_str(&format!(
+          "<a href=\"{}\">{}</a><br>",
+          to,
+          text.unwrap_or(to.clone())
+        ));
+      }
+      Node::Heading {
+        level,
+        text,
+      } => {
+        html.push_str(&format!(
+          "<{}>{}</{0}>",
+          match level {
+            1 => "h1",
+            2 => "h2",
+            3 => "h3",
+            _ => "p",
+          },
+          text
+        ));
+      }
+      Node::List(items) =>
+        html.push_str(&format!(
+          "<ul>{}</ul>",
+          items
+            .into_iter()
+            .map(|i| format!("<li>{}</li>", i))
+            .collect::<Vec<String>>()
+            .join("\n")
+        )),
+      Node::Blockquote(text) =>
+        html.push_str(&format!("<blockquote>{}</blockquote>", text)),
+      Node::PreformattedText {
+        text, ..
+      } => {
+        html.push_str(&format!("<pre>{}</pre>", text));
+      }
+      _ => {}
+    }
+  }
+
+  html
+}
diff --git a/src/convert/markdown.rs b/src/convert/markdown.rs
new file mode 100644
index 0000000..e9855a2
--- /dev/null
+++ b/src/convert/markdown.rs
@@ -0,0 +1,77 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+use crate::ast::Node;
+
+pub fn convert(source: Vec<Node>) -> String {
+  let mut markdown = String::new();
+
+  // Since we have an AST tree of the Gemtext, it is very easy to convert from
+  // this AST tree to an alternative markup format.
+  for node in source {
+    match node {
+      Node::Text(text) => markdown.push_str(&text),
+      Node::Link {
+        to,
+        text,
+      } =>
+        markdown.push_str(&if let Some(text) = text {
+          format!("[{}]({})", text, to)
+        } else {
+          format!("<{}>", to)
+        }),
+      Node::Heading {
+        level,
+        text,
+      } => {
+        markdown.push_str(&format!(
+          "{} {}",
+          match level {
+            1 => "#",
+            2 => "##",
+            3 => "###",
+            _ => "",
+          },
+          text
+        ));
+      }
+      Node::List(items) =>
+        markdown.push_str(
+          &items
+            .into_iter()
+            .map(|i| format!("- {}", i))
+            .collect::<Vec<String>>()
+            .join("\n"),
+        ),
+      Node::Blockquote(text) => markdown.push_str(&format!("> {}", text)),
+      Node::PreformattedText {
+        alt_text,
+        text,
+      } => {
+        markdown.push_str(&format!(
+          "```{}\n{}\n```",
+          alt_text.unwrap_or("".to_string()),
+          text
+        ));
+      }
+      Node::Whitespace => markdown.push('\n'),
+    }
+  }
+
+  markdown
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..8b47af8
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,36 @@
+// This file is part of Germ <https://github.com/gemrest/germ>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program 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, version 3.
+//
+// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#![deny(
+  warnings,
+  nonstandard_style,
+  unused,
+  future_incompatible,
+  rust_2018_idioms,
+  unsafe_code,
+  clippy::all,
+  clippy::nursery,
+  clippy::pedantic
+)]
+#![recursion_limit = "128"]
+
+#[cfg(feature = "ast")]
+pub mod ast;
+
+#[cfg(feature = "convert")]
+pub mod convert;