feat: initial release

15 files changed, 1707 insertions, 0 deletions

diff --git a/.github/workflows/rust.yaml b/.github/workflows/rust.yaml
new file mode 100644
index 0000000..e994afb
--- /dev/null
+++ b/.github/workflows/rust.yaml
@@ -0,0 +1,35 @@
+name: Rust ✅
+
+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..1de0ed8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+# Rust
+target
+Cargo.lock
+
+# CLion
+.idea
diff --git a/.license_template b/.license_template
new file mode 100644
index 0000000..e30635e
--- /dev/null
+++ b/.license_template
@@ -0,0 +1,16 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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..24451e3
--- /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 = "syndey"
+version = "0.1.0"
+authors = ["Fuwn <[email protected]>"]
+edition = "2021"
+description = "Vim-like, Command-line Gemini Client"
+readme = "README.md"
+homepage = "https://github.com/gemrest/sydney"
+repository = "https://github.com/gemrest/sydney"
+license = "GPL-3.0-only"
+keywords = ["gemini", "client"]
+
+[dependencies]
+germ = { version = "0.3.3", default-features = false, features = ["request", "ast"] } # Gemini
+url = "2.2.2" # URL
+tui = "0.18.0" # Terminal User Interface
+crossterm = "0.24.0" # Cross-platform Terminal
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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+specifically granted under this License.  You may not convey a covered
+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..1ede7b6
--- /dev/null
+++ b/Makefile.toml
@@ -0,0 +1,33 @@
+[tasks.fmt]
+args = ["fmt"]
+command = "cargo"
+toolchain = "nightly"
+workspace = false
+
+[tasks.check]
+args = ["check", "--all-features"]
+command = "cargo"
+workspace = false
+
+[tasks.clippy]
+args = ["clippy", "--all-features"]
+command = "cargo"
+workspace = false
+
+[tasks.test]
+args = ["test", "--all-features"]
+command = "cargo"
+workspace = false
+
+[tasks.checkf]
+dependencies = ["fmt", "check"]
+workspace = false
+
+[tasks.checkfc]
+dependencies = ["fmt", "check", "clippy"]
+workspace = false
+
+[tasks.run]
+args = ["run", "--", "${@}"]
+command = "cargo"
+workspace = false
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1a20618
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+# Sydney
+
+[![crates.io](https://img.shields.io/crates/v/sydney.svg)](https://crates.io/crates/sydney)
+[![github.com](https://github.com/gemrest/sydney/actions/workflows/rust.yaml/badge.svg?branch=main)](https://github.com/gemrest/sydney/actions/workflows/rust.yaml)
+
+Sydney is a Vim-like, command-line Gemini client.
+
+Sydney has a beautiful, intuitive, and powerful command-line interface;
+including:
+
+- Vim-like keybindings
+- Vim-like commands
+- Intuitive link handling
+- Understandable errors
+- Customizable UI
+
+## Usage
+
+### Installation
+
+```shell
+cargo install sydney --force
+```
+
+### Help
+
+```shell
+usage: syndey [option, capsule_uri]
+Options:
+    --version, -v    show version text
+    --help, -h       show help text
+
+Sample invocations:
+    syndey gemini://gem.rest/
+    syndey --help
+
+Report bugs to https://github.com/gemrest/sydney/issues
+
+```
+
+## License
+
+This project is licensed with the [GNU General Public License v3.0](https://github.com/gemrest/sydney/blob/main/LICENSE).
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..60883f4
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.59.0"
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/app.rs b/src/app.rs
new file mode 100644
index 0000000..278a96c
--- /dev/null
+++ b/src/app.rs
@@ -0,0 +1,203 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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 std::time::{Duration, Instant};
+
+use crossterm::event;
+use germ::request::Status;
+use url::Url;
+
+use crate::{input::Mode as InputMode, stateful_list::StatefulList};
+
+pub struct App {
+  pub items:                  StatefulList<(Vec<String>, Option<String>)>,
+  pub input:                  String,
+  pub input_mode:             InputMode,
+  pub command_stroke_history: Vec<event::KeyCode>,
+  pub command_history:        Vec<String>,
+  pub command_history_cursor: usize,
+  pub error:                  Option<String>,
+  pub url:                    Url,
+  pub capsule_history:        Vec<Url>,
+  pub previous_capsule:       Option<Url>,
+  pub response_input:         String,
+  pub accept_response_input:  bool,
+  pub response_input_text:    String,
+  pub wrap_at:                usize,
+}
+impl App {
+  pub fn new() -> Self {
+    let url = Url::parse("gemini://gemini.circumlunar.space/").unwrap();
+
+    let mut app = Self {
+      response_input: String::new(),
+      error: None,
+      command_stroke_history: Vec::new(),
+      input: String::new(),
+      input_mode: InputMode::Normal,
+      items: StatefulList::with_items(Vec::new()),
+      command_history: vec![],
+      command_history_cursor: 0,
+      url,
+      capsule_history: vec![],
+      previous_capsule: None,
+      accept_response_input: false,
+      response_input_text: "".to_string(),
+      wrap_at: 80,
+    };
+
+    app.make_request();
+
+    app
+  }
+
+  pub fn set_url(&mut self, url: Url) {
+    self.previous_capsule = Some(self.url.clone());
+    self.url = url;
+  }
+
+  pub fn make_request(&mut self) {
+    self.items = StatefulList::with_items({
+      let mut items = vec![];
+
+      match germ::request::request(&self.url) {
+        Ok(mut response) => {
+          if response.status() == &Status::TemporaryRedirect
+            || response.status() == &Status::PermanentRedirect
+          {
+            self.url = Url::parse(&if response.meta().starts_with('/') {
+              format!(
+                "gemini://{}{}",
+                self.url.host_str().unwrap(),
+                response.meta()
+              )
+            } else if response.meta().starts_with("gemini://") {
+              response.meta().to_string()
+            } else if !response.meta().starts_with('/')
+              && !response.meta().starts_with("gemini://")
+            {
+              format!(
+                "{}/{}",
+                self.url.to_string().trim_end_matches('/'),
+                response.meta()
+              )
+            } else {
+              self.url.to_string()
+            })
+            .unwrap();
+
+            response = germ::request::request(&self.url).unwrap();
+          }
+
+          if response.status() == &Status::Input
+            || response.status() == &Status::SensitiveInput
+          {
+            self.accept_response_input = true;
+            self.response_input_text = response.meta().to_string();
+          }
+
+          if let Some(content) = response.content().clone() {
+            for line in content.lines().clone() {
+              let line = line.replace('\t', " ");
+              let mut parts = line.split_whitespace();
+              let lines = if line.is_empty() {
+                vec![line.to_string()]
+              } else {
+                line
+                  .as_bytes()
+                  .chunks(self.wrap_at)
+                  .map(|buf| {
+                    #[allow(unsafe_code)]
+                    unsafe { std::str::from_utf8_unchecked(buf) }.to_string()
+                  })
+                  .collect::<Vec<_>>()
+              };
+
+              if let (Some("=>"), Some(to)) = (parts.next(), parts.next()) {
+                items.push((lines, Some(to.to_string())));
+              } else {
+                items.push((lines, None));
+              }
+            }
+          } else if response.status() != &Status::Input
+            && response.status() != &Status::SensitiveInput
+          {
+            items.push((vec![response.meta().to_string()], None));
+
+            self.error = Some(response.meta().to_string());
+          }
+
+          if let Some(last_url) = self.capsule_history.last() {
+            if last_url.to_string() != self.url.to_string() {
+              self.capsule_history.push(self.url.clone());
+            }
+          } else {
+            self.capsule_history.push(self.url.clone());
+          }
+        }
+        Err(error) => {
+          self.error = Some(error.to_string());
+
+          return;
+        }
+      }
+
+      items
+    });
+  }
+
+  pub fn run<B: tui::backend::Backend>(
+    terminal: &mut tui::Terminal<B>,
+    mut app: Self,
+    tick_rate: Duration,
+  ) -> std::io::Result<()> {
+    let mut last_tick = Instant::now();
+    loop {
+      terminal.draw(|f| crate::ui::ui(f, &mut app))?;
+
+      let timeout = tick_rate
+        .checked_sub(last_tick.elapsed())
+        .unwrap_or_else(|| Duration::from_secs(0));
+
+      if event::poll(timeout)? {
+        if let event::Event::Key(key) = event::read()? {
+          if crate::input::handle_key_strokes(&mut app, key) {
+            return Ok(());
+          }
+        }
+      }
+
+      if last_tick.elapsed() >= tick_rate {
+        last_tick = Instant::now();
+      }
+    }
+  }
+
+  pub fn go_back(&mut self) {
+    if let Some(url) = self.capsule_history.pop() {
+      if url == self.url {
+        if let Some(url) = self.capsule_history.pop() {
+          self.set_url(url);
+        }
+      } else {
+        self.set_url(url);
+      }
+
+      self.make_request();
+    }
+  }
+}
diff --git a/src/command.rs b/src/command.rs
new file mode 100644
index 0000000..4dc3615
--- /dev/null
+++ b/src/command.rs
@@ -0,0 +1,49 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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
+
+pub enum Command {
+  Quit,
+  Open(Option<String>),
+  Unknown,
+  Wrap(usize, Option<String>),
+}
+impl From<String> for Command {
+  fn from(s: String) -> Self {
+    let mut tokens = s.split(' ');
+
+    match tokens.next() {
+      Some("open" | "o") => Self::Open(tokens.next().map(ToString::to_string)),
+      Some("quit" | "q") => Self::Quit,
+      Some("wrap") =>
+        tokens.next().map_or_else(
+          || {
+            Self::Wrap(
+              80,
+              Some("Missing width argument to wrap command".to_string()),
+            )
+          },
+          |at| {
+            match at.parse() {
+              Ok(at_parsed) => Self::Wrap(at_parsed, None),
+              Err(error) => Self::Wrap(80, Some(error.to_string())),
+            }
+          },
+        ),
+      _ => Self::Unknown,
+    }
+  }
+}
diff --git a/src/input.rs b/src/input.rs
new file mode 100644
index 0000000..9a4c3e6
--- /dev/null
+++ b/src/input.rs
@@ -0,0 +1,267 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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 crossterm::event::KeyCode;
+use url::Url;
+
+use crate::command::Command;
+
+pub enum Mode {
+  Normal,
+  Editing,
+}
+
+fn handle_input_response(
+  mut app: &mut crate::App,
+  key: crossterm::event::KeyEvent,
+) -> bool {
+  match key.code {
+    KeyCode::Enter => {
+      let new_url = match app.url.to_string().split('?').next() {
+        Some(base_url) => {
+          format!("{}?{}", base_url, app.response_input)
+        }
+        None => "".to_string(),
+      };
+
+      if new_url.is_empty() {
+        app.error = Some("Invalid base URL".to_string());
+
+        return false;
+      }
+
+      match Url::parse(&new_url) {
+        Ok(url) => {
+          app.set_url(url);
+          app.make_request();
+          app.response_input.clear();
+          app.response_input_text.clear();
+
+          app.accept_response_input = false;
+        }
+        Err(error) => {
+          app.error = Some(error.to_string());
+        }
+      }
+    }
+    KeyCode::Esc => {
+      app.accept_response_input = false;
+
+      app.response_input.clear();
+      app.response_input_text.clear();
+      app.go_back();
+    }
+    KeyCode::Char(c) => {
+      app.response_input.push(c);
+    }
+    KeyCode::Backspace => {
+      app.response_input.pop();
+    }
+    _ => {}
+  }
+
+  false
+}
+
+fn handle_normal_input(
+  mut app: &mut crate::App,
+  key: crossterm::event::KeyEvent,
+) -> bool {
+  match key.code {
+    KeyCode::Char(':') => {
+      app.input.push(':');
+
+      app.input_mode = Mode::Editing;
+      app.error = None;
+    }
+    KeyCode::Esc => app.items.unselect(),
+    KeyCode::Down | KeyCode::Char('j') => {
+      app.items.next();
+
+      app.error = None;
+    }
+    KeyCode::Up | KeyCode::Char('k') => {
+      app.items.previous();
+
+      app.error = None;
+    }
+    KeyCode::Char('h') | KeyCode::Left => {
+      app.go_back();
+    }
+    KeyCode::Char('l') | KeyCode::Right => {
+      if let Some(url) = app.previous_capsule.clone() {
+        app.set_url(url);
+
+        app.previous_capsule = None;
+
+        app.make_request();
+      }
+    }
+    KeyCode::Char('G') => app.items.last(),
+    KeyCode::Char('g') =>
+      if app.command_stroke_history.contains(&key.code) {
+        app.items.first();
+        app.command_stroke_history.clear();
+      } else if app.command_stroke_history.is_empty() {
+        app.command_stroke_history.push(key.code);
+      },
+    KeyCode::Backspace => app.error = None,
+    KeyCode::Enter => {
+      if let Some(link) = &app.items.items[app.items.selected].1 {
+        if !link.starts_with("gemini://") && link.contains("://") {
+        } else {
+          let the_url = &if link.starts_with('/') {
+            format!("gemini://{}{}", app.url.host_str().unwrap(), link)
+          } else if link.starts_with("gemini://") {
+            link.to_string()
+          } else if !link.starts_with('/') && !link.starts_with("gemini://") {
+            format!("{}/{}", app.url.to_string().trim_end_matches('/'), link)
+          } else {
+            app.url.to_string()
+          };
+
+          app.set_url(Url::parse(the_url).unwrap());
+          app.make_request();
+        }
+      }
+    }
+    _ => {}
+  }
+
+  false
+}
+
+fn handle_editing_input(
+  mut app: &mut crate::App,
+  key: crossterm::event::KeyEvent,
+) -> bool {
+  match key.code {
+    KeyCode::Enter => {
+      if let Some(command) = app.input.get(1..) {
+        app.command_history.reverse();
+        app.command_history.push(command.to_string());
+        app.command_history.reverse();
+      }
+
+      match Command::from(
+        app.input.to_string().get(1..).unwrap_or("").to_string(),
+      ) {
+        Command::Quit => return true,
+        Command::Open(to) => {
+          if let Some(to) = to {
+            // Remove colon
+            app.input = app.input.chars().rev().collect();
+
+            app.input.pop();
+
+            app.input = app.input.chars().rev().collect();
+            app.set_url(
+              Url::parse(&if to.starts_with("gemini://") {
+                to
+              } else {
+                format!("gemini://{}", to)
+              })
+              .unwrap(),
+            );
+
+            app.make_request();
+          } else {
+            app.error = Some("No URL provided for open command".to_string());
+          }
+        }
+        Command::Unknown =>
+          if app.input == ":" {
+            app.input_mode = Mode::Normal;
+          } else {
+            app.error = Some(format!(
+              "\"{}\" is not a valid command",
+              app.input.to_string().get(1..).unwrap_or("")
+            ));
+          },
+        Command::Wrap(at, error) =>
+          if let Some(error) = error {
+            app.error = Some(error);
+          } else {
+            app.error = None;
+            app.wrap_at = at;
+          },
+      }
+
+      app.input_mode = Mode::Normal;
+      app.command_history_cursor = 0;
+
+      app.input.clear();
+    }
+    KeyCode::Char(c) => {
+      app.input.push(c);
+    }
+    KeyCode::Up => {
+      if let Some(command) = app.command_history.get(app.command_history_cursor)
+      {
+        app.input = format!(":{}", command);
+
+        if app.command_history_cursor + 1 < app.command_history.len() {
+          app.command_history_cursor += 1;
+        }
+      }
+    }
+    KeyCode::Down => {
+      let mut dead_set = false;
+
+      if app.command_history_cursor > 0 {
+        app.command_history_cursor -= 1;
+      } else {
+        dead_set = true;
+      }
+
+      if let Some(command) = app.command_history.get(app.command_history_cursor)
+      {
+        app.input = format!(":{}", command);
+      }
+
+      if dead_set {
+        app.input = ":".to_string();
+      }
+    }
+    KeyCode::Backspace => {
+      app.input.pop();
+    }
+    KeyCode::Esc => {
+      app.input_mode = Mode::Normal;
+
+      app.input.clear();
+    }
+    _ => {}
+  }
+
+  false
+}
+
+pub fn handle_key_strokes(
+  app: &mut crate::App,
+  key: crossterm::event::KeyEvent,
+) -> bool {
+  match app.input_mode {
+    Mode::Normal =>
+      if app.accept_response_input {
+        handle_input_response(app, key)
+      } else {
+        handle_normal_input(app, key)
+      },
+    Mode::Editing => handle_editing_input(app, key),
+  }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..77841a9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,106 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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"]
+
+mod app;
+mod command;
+mod input;
+mod stateful_list;
+mod ui;
+
+use app::App;
+use crossterm::{event, execute, terminal};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+  let mut args = std::env::args();
+  let mut app = App::new();
+
+  if let Some(arg) = args.nth(1) {
+    match arg.as_str() {
+      "--version" | "-v" => {
+        println!("{}", env!("CARGO_PKG_VERSION"));
+
+        return Ok(());
+      }
+      "--help" | "-h" => {
+        println!(
+          r#"usage: {} [option, capsule_uri]
+Options:
+    --version, -v    show version text
+    --help, -h       show help text
+
+Sample invocations:
+    {0} gemini://gem.rest/
+    {0} --help
+
+Report bugs to https://github.com/gemrest/sydney/issues"#,
+          args
+            .next()
+            .unwrap_or_else(|| env!("CARGO_PKG_NAME").to_string())
+        );
+
+        return Ok(());
+      }
+      _ => {
+        app.url = url::Url::parse(&arg)?;
+
+        app.make_request();
+      }
+    }
+  }
+
+  terminal::enable_raw_mode()?;
+
+  let mut stdout = std::io::stdout();
+
+  execute!(
+    stdout,
+    terminal::EnterAlternateScreen,
+    event::EnableMouseCapture
+  )?;
+
+  let mut terminal =
+    tui::Terminal::new(tui::backend::CrosstermBackend::new(stdout))?;
+  let result =
+    App::run(&mut terminal, app, std::time::Duration::from_millis(250));
+
+  terminal::disable_raw_mode()?;
+  execute!(
+    terminal.backend_mut(),
+    terminal::LeaveAlternateScreen,
+    event::DisableMouseCapture
+  )?;
+  terminal.show_cursor()?;
+
+  if let Err(err) = result {
+    println!("{:?}", err);
+  }
+
+  Ok(())
+}
diff --git a/src/stateful_list.rs b/src/stateful_list.rs
new file mode 100644
index 0000000..50c71cc
--- /dev/null
+++ b/src/stateful_list.rs
@@ -0,0 +1,82 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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
+
+//! <https://github.com/fdehau/tui-rs/blob/master/examples/list.rs>
+
+use tui::widgets::ListState;
+
+pub struct StatefulList<T> {
+  pub state:    ListState,
+  pub items:    Vec<T>,
+  pub selected: usize,
+}
+
+impl<T> StatefulList<T> {
+  pub fn with_items(items: Vec<T>) -> Self {
+    Self {
+      state: ListState::default(),
+      items,
+      selected: 0,
+    }
+  }
+
+  pub fn next(&mut self) {
+    let i = match self.state.selected() {
+      Some(i) =>
+        if i >= self.items.len() - 1 {
+          0
+        } else {
+          i + 1
+        },
+      None => 0,
+    };
+
+    self.selected = i;
+
+    self.state.select(Some(i));
+  }
+
+  pub fn previous(&mut self) {
+    let i = match self.state.selected() {
+      Some(i) =>
+        if i == 0 {
+          self.items.len() - 1
+        } else {
+          i - 1
+        },
+      None => 0,
+    };
+
+    self.selected = i;
+
+    self.state.select(Some(i));
+  }
+
+  pub fn last(&mut self) {
+    self.state.select(Some(self.items.len() - 1));
+
+    self.selected = self.items.len() - 1;
+  }
+
+  pub fn first(&mut self) {
+    self.state.select(Some(0));
+
+    self.selected = 0;
+  }
+
+  pub fn unselect(&mut self) { self.state.select(None); }
+}
diff --git a/src/ui.rs b/src/ui.rs
new file mode 100644
index 0000000..b43a119
--- /dev/null
+++ b/src/ui.rs
@@ -0,0 +1,142 @@
+// This file is part of Germ <https://github.com/gemrest/sydney>.
+//
+// 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 tui::{
+  layout::{Constraint, Direction, Layout, Rect},
+  style::{Color, Style},
+  widgets,
+  widgets::{ListItem, Paragraph},
+};
+
+pub fn ui<B: tui::backend::Backend>(
+  f: &mut tui::Frame<'_, B>,
+  app: &mut crate::App,
+) {
+  let chunks = Layout::default()
+    .direction(Direction::Vertical)
+    .constraints(
+      [
+        Constraint::Percentage(95),
+        Constraint::Percentage(4),
+        Constraint::Percentage(1),
+      ]
+      .as_ref(),
+    )
+    .split(f.size());
+
+  let items: Vec<ListItem<'_>> = app
+    .items
+    .items
+    .iter()
+    .map(|(text_lines, _link)| {
+      let mut spans = vec![];
+
+      for line in text_lines {
+        spans.push(tui::text::Spans::from(line.as_str()));
+      }
+
+      ListItem::new(spans)
+    })
+    .collect();
+
+  let items = widgets::List::new(items).highlight_style(
+    Style::default()
+      .bg(Color::White)
+      .fg(Color::Black)
+      .add_modifier(tui::style::Modifier::BOLD),
+  );
+
+  f.render_stateful_widget(items, chunks[0], &mut app.items.state);
+  f.render_widget(
+    Paragraph::new(app.url.to_string())
+      .style(Style::default().bg(Color::White).fg(Color::Black)),
+    chunks[1],
+  );
+
+  if let Some(error) = app.error.as_ref() {
+    f.render_widget(
+      Paragraph::new(&**error).style(Style::default().bg(Color::Red)),
+      chunks[2],
+    );
+  } else if !app.input.is_empty() {
+    f.render_widget(Paragraph::new(&*app.input), chunks[2]);
+  }
+
+  if app.accept_response_input {
+    let block = widgets::Block::default()
+      .title(app.url.to_string())
+      .borders(widgets::Borders::ALL);
+    let area = centered_rect(60, 20, f.size());
+
+    f.render_widget(widgets::Clear, area);
+    f.render_widget(block.clone(), area);
+    f.render_widget(
+      Paragraph::new(format!(
+        "{} {}",
+        app.response_input_text.trim(),
+        app.response_input
+      ))
+      .wrap(widgets::Wrap {
+        trim: false
+      }),
+      block.inner(area),
+    );
+  }
+
+  if let Some(error) = &app.error {
+    let block = widgets::Block::default()
+      .title("Sydney")
+      .borders(widgets::Borders::ALL)
+      .style(Style::default().bg(Color::Cyan));
+    let area = centered_rect(60, 20, f.size());
+
+    f.render_widget(widgets::Clear, area);
+    f.render_widget(block.clone(), area);
+    f.render_widget(
+      Paragraph::new(error.to_string()).wrap(widgets::Wrap {
+        trim: false
+      }),
+      block.inner(area),
+    );
+  }
+}
+
+fn centered_rect(percent_x: u16, percent_y: u16, r: Rect) -> Rect {
+  let popup_layout = Layout::default()
+    .direction(Direction::Vertical)
+    .constraints(
+      [
+        Constraint::Percentage((100 - percent_y) / 2),
+        Constraint::Percentage(percent_y),
+        Constraint::Percentage((100 - percent_y) / 2),
+      ]
+      .as_ref(),
+    )
+    .split(r);
+
+  Layout::default()
+    .direction(Direction::Horizontal)
+    .constraints(
+      [
+        Constraint::Percentage((100 - percent_x) / 2),
+        Constraint::Percentage(percent_x),
+        Constraint::Percentage((100 - percent_x) / 2),
+      ]
+      .as_ref(),
+    )
+    .split(popup_layout[1])[1]
+}