Move uncritical files into `etc/` (#350)

This is mainly just to reduce the amount of files in the project root.
The criteria of what gets into `etc/` are the following:

* The file should not be necessary for building nsxiv. This excludes the
  `icon/*` stuff since that's needed by `window.c`.
* The file shouldn't have any valid reason to stay in the project root.
  This excludes things like `README.md`, `.gitignore` etc.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/350
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

13 files changed, 1271 insertions, 0 deletions

diff --git a/etc/CHANGELOG.md b/etc/CHANGELOG.md
new file mode 100644
index 0000000..100e24a
--- /dev/null
+++ b/etc/CHANGELOG.md
@@ -0,0 +1,397 @@
+nsxiv - Changelog
+-----------------
+
+**[git](https://codeberg.org/nsxiv/nsxiv.git)**
+
+Changes will only be documented on stable releases. If you're on git/master then
+there may be more changes. Please use `git log` to view them.
+
+- - -
+
+***SPECIAL NOTE***: Due to [this incident](https://codeberg.org/nsxiv/nsxiv-tmp/issues/1)
+we have moved development over to [CodeBerg](https://codeberg.org/nsxiv/nsxiv).
+
+A lot of the references *below* may now be 404 on GitHub. Any threads which
+survived the wipe have been migrated over to [nsxiv-record]. All of the
+references *above* can be found on the new main nsxiv repository on CodeBerg.
+
+[nsxiv-record]: https://codeberg.org/nsxiv/nsxiv-record/
+
+- - -
+
+**[v30](https://codeberg.org/nsxiv/nsxiv/archive/v30.tar.gz)**
+*(June 15, 2022)*
+
+* Changes:
+
+  * Development and main repository moved over to Codeberg.
+    See the special note above for more info.
+  * `autoreload_{inotify,nop}.c` merged into a single file, `autoreload.c`. [#263]
+  * Moved all configuration related macros to `config.mk`. [#264]
+  * `win-title` is now called only when there's change rather than being called
+    on each redraw. [#266]
+
+* Added:
+
+  * Added more mimetypes to the `.desktop` entry. [#260]
+  * Added `thumb-info` for customizing the statusbar in thumbnail-mode. [#265]
+  * Added comments for building on OpenBSD. [#264]
+
+* Fixes:
+
+  * "Too many open file" error due to not closing the win-title script. [#245]
+  * `-f` now directly starts in fullscreen mode rather than opening a normal
+    window and then going fullscreen. [#251]
+  * Broken slideshow on slow systems or fast animations. [#282]
+  * Memory leak when removing an image in thumbnail mode. [#247]
+  * Correctly setting `_NET_WM_PID`. [#251]
+  * Don't override statusbar if info script doesn't exist. [#271]
+  * Potential misbehavior regarding font. [#250]
+
+[#245]: https://codeberg.org/nsxiv/nsxiv-record/pulls/245
+[#247]: https://codeberg.org/nsxiv/nsxiv-record/pulls/247
+[#250]: https://codeberg.org/nsxiv/nsxiv-record/pulls/250
+[#251]: https://codeberg.org/nsxiv/nsxiv-record/pulls/251
+[#263]: https://codeberg.org/nsxiv/nsxiv-record/pulls/263
+[#264]: https://codeberg.org/nsxiv/nsxiv-record/pulls/264
+[#260]: https://codeberg.org/nsxiv/nsxiv-record/pulls/260
+[#264]: https://codeberg.org/nsxiv/nsxiv-record/pulls/264
+[#265]: https://codeberg.org/nsxiv/nsxiv-record/pulls/265
+[#266]: https://codeberg.org/nsxiv/nsxiv-record/pulls/266
+[#271]: https://codeberg.org/nsxiv/nsxiv-record/pulls/271
+[#282]: https://codeberg.org/nsxiv/nsxiv-record/pulls/282
+
+- - -
+
+**[v29](https://github.com/nsxiv/nsxiv/archive/v29.tar.gz)**
+*(March 03, 2022)*
+
+* Changes:
+
+  * Window title is now customizeable via `win-title`, cli flag `-T` and related
+    config.h options are removed. See `WINDOW TITLE` section of the manpage for
+    more info. [#213]
+  * Imlib2 cache size is now set based on total memory percentage, by default
+    set to 3%. [#184]
+  * Removed some non-POSIX extensions in the Makefile. [#225]
+
+* Added:
+
+  * Ability to customize thumbnail mode mouse-bindings via `config.h`. [#167]
+  * Option to set statusbar position to top via `config.h`. [#231]
+  * New keybinding <kbd>z</kbd> to scroll to center. [#203]
+
+* Fixes:
+
+  * Manpage cleanup: avoid confusing wording and document thumbnail mode
+    mouse-bindings. [#186]
+  * Wrong jpeg exif orientation with Imlib2 v1.7.5 (and above). [#188]
+  * Animation slowdown when zoomed in. [#200]
+  * Reset statusbar after failed keyhandler. [#191]
+  * Window title not working on certain WMs. [#234]
+  * Various compiler warnings. [#197]
+
+[#167]: https://codeberg.org/nsxiv/nsxiv-record/pulls/167
+[#184]: https://codeberg.org/nsxiv/nsxiv-record/pulls/184
+[#186]: https://codeberg.org/nsxiv/nsxiv-record/pulls/186
+[#188]: https://codeberg.org/nsxiv/nsxiv-record/pulls/188
+[#191]: https://codeberg.org/nsxiv/nsxiv-record/pulls/191
+[#197]: https://codeberg.org/nsxiv/nsxiv-record/pulls/197
+[#200]: https://codeberg.org/nsxiv/nsxiv-record/pulls/200
+[#203]: https://codeberg.org/nsxiv/nsxiv-record/pulls/203
+[#213]: https://codeberg.org/nsxiv/nsxiv-record/pulls/213
+[#225]: https://codeberg.org/nsxiv/nsxiv-record/pulls/225
+[#231]: https://codeberg.org/nsxiv/nsxiv-record/pulls/231
+[#234]: https://codeberg.org/nsxiv/nsxiv-record/pulls/234
+
+- - -
+
+**[v28](https://github.com/nsxiv/nsxiv/archive/v28.tar.gz)**
+*(December 12, 2021)*
+
+* Changes:
+
+  * Statusbar made optional via `HAVE_LIBFONTS`. [#95]
+  * Remove library auto-detection, use `OPT_DEP_DEFAULT` instead. [#71]
+  * Example scripts will now be installed into `EGPREFIX`
+    (`$(PREFIX)/share/doc/nsxiv/examples` by default). See README for more
+    info. [#86]
+
+* Added:
+
+  * Animated webp support (optional via `HAVE_LIBWEBP`). [#20]
+  * New mouse-binding <kbd>Ctrl-Button1</kbd> for relative drag. [#117]
+  * Ability to configure colors and fonts in `config.h`. [#115]
+  * Ability to configure navigation width area in `config.h`. [#155]
+  * Ability to customize the set of modifiers used when processing keybindings
+    in `config.h` via `USED_MODMASK`. [#150]
+  * Ability to configure Imlib2's cache size for better image (re)loading
+    performance in `config.h`. [#171]
+  * Cli flag `-0` for sending null-seperated file-list to standard out (`-o`),
+    and key-handler and receiving null-seperated file-list via stdin (`-i`).
+    [#68] [#141] [#164]
+  * Export environment variable `NSXIV_USING_NULL` to key-handler. [#164]
+  * Embed new nsxiv icon. [#163]
+  * `make install-icon` to install icons. [#80] [#96]
+  * `make install-desktop` to install .desktop entry. [#80] [#96]
+  * `make install-all` to install everything. [#80] [#96]
+  * Configurable `KEYHANDLER_ABORT` in `config.h`. [#91] [#172]
+  * Statusbar message upon key-handler activation. [#98]
+  * Ability to write custom C functions in `config.h` and use them via
+    keybindings. [#76]
+
+* Fixes:
+
+  * Not able to use `KEYHANDLER_ABORT` key (<kbd>Escape</kbd> by default) in
+    regular keybindings. [#91]
+  * Memory leak related to Xresources. [#134]
+  * Memory leak in gif loader. [#165]
+  * Better handle gif colormap and prevent out-of-bound access. [#165]
+  * Prevent crash when zooming out in very small images. [#178]
+  * Removed non-POSIX commands and extensions from `Makefile`. [#71]
+  * Regression where nsxiv wouldn't run on non-TrueColor X server. [#114]
+  * Wrong comments in `config.h` and description in `manpage`.
+    [#105] [#106] [#152]
+
+[#20]: https://codeberg.org/nsxiv/nsxiv-record/pulls/20
+[#68]: https://codeberg.org/nsxiv/nsxiv-record/pulls/68
+[#71]: https://codeberg.org/nsxiv/nsxiv-record/pulls/71
+[#76]: https://codeberg.org/nsxiv/nsxiv-record/pulls/76
+[#80]: https://codeberg.org/nsxiv/nsxiv-record/pulls/80
+[#86]: https://codeberg.org/nsxiv/nsxiv-record/pulls/86
+[#91]: https://codeberg.org/nsxiv/nsxiv-record/pulls/91
+[#95]: https://codeberg.org/nsxiv/nsxiv-record/pulls/95
+[#96]: https://codeberg.org/nsxiv/nsxiv-record/pulls/96
+[#98]: https://codeberg.org/nsxiv/nsxiv-record/pulls/98
+[#105]: https://codeberg.org/nsxiv/nsxiv-record/pulls/105
+[#106]: https://codeberg.org/nsxiv/nsxiv-record/pulls/106
+[#114]: https://codeberg.org/nsxiv/nsxiv-record/pulls/114
+[#115]: https://codeberg.org/nsxiv/nsxiv-record/pulls/115
+[#117]: https://codeberg.org/nsxiv/nsxiv-record/pulls/117
+[#134]: https://codeberg.org/nsxiv/nsxiv-record/pulls/134
+[#141]: https://codeberg.org/nsxiv/nsxiv-record/pulls/141
+[#150]: https://codeberg.org/nsxiv/nsxiv-record/pulls/150
+[#152]: https://codeberg.org/nsxiv/nsxiv-record/pulls/152
+[#155]: https://codeberg.org/nsxiv/nsxiv-record/pulls/155
+[#163]: https://codeberg.org/nsxiv/nsxiv-record/pulls/163
+[#164]: https://codeberg.org/nsxiv/nsxiv-record/pulls/164
+[#165]: https://codeberg.org/nsxiv/nsxiv-record/pulls/165
+[#171]: https://codeberg.org/nsxiv/nsxiv-record/pulls/171
+[#172]: https://codeberg.org/nsxiv/nsxiv-record/pulls/172
+[#178]: https://codeberg.org/nsxiv/nsxiv-record/pulls/178
+
+- - -
+
+**[v27.1](https://github.com/nsxiv/nsxiv/archive/v27.1.tar.gz)**
+*(September 16, 2021)*
+
+* Fixes:
+
+  * Source tarball failing build [#66]
+
+[#66]: https://codeberg.org/nsxiv/nsxiv-record/pulls/66
+
+- - -
+
+**[v27](https://github.com/nsxiv/nsxiv/archive/v27.tar.gz)**
+*(September 16, 2021)*
+
+* Changes:
+
+  * Re-release under the name nsxiv.
+  * Xresources `Sxiv.foreground` and `Sxiv.background` changed
+    to `Nsxiv.window.foreground` and `Nsxiv.window.background`.
+  * Xresources `Sxiv.font` changed to `Nsxiv.bar.font`.
+  * Rework the build system. Now by default we'll build with only optional
+    dependencies that are already installed. [#19]
+
+* Added:
+
+  * Fill scale mode. [#2]
+  * Configurable X window title (via `config.h` and the `-T` flag). [#23]
+  * Support custom bar colors via Xresources. [#19]
+  * Support custom mark color via Xresources. [#51]
+  * Toggle animation playback with <kbd>Ctrl-a</kbd>. [#33]
+  * Set `_NET_WM_PID` and `WM_CLIENT_MACHINE` X properties. [#13]
+  * Set `ICCCM WM manager` hints. [#12]
+
+* Fixes:
+
+  * Cli flag `-G` not initially setting gamma. [#31]
+  * Wrong keybinding description in the manpage. [#14]
+  * .desktop entry not advertising webp support. [#15]
+  * Prevent crash when embedded into transparent window. [#3]
+  * Small memory leak. [#57]
+  * Rare crash when showing some GIFs. [#41]
+  * Rare event where nsxiv wouldn't close after window being destroyed. [#53]
+
+[#2]: https://codeberg.org/nsxiv/nsxiv-record/pulls/2
+[#3]: https://codeberg.org/nsxiv/nsxiv-record/pulls/3
+[#12]: https://codeberg.org/nsxiv/nsxiv-record/pulls/12
+[#13]: https://codeberg.org/nsxiv/nsxiv-record/pulls/13
+[#14]: https://codeberg.org/nsxiv/nsxiv-record/pulls/14
+[#15]: https://codeberg.org/nsxiv/nsxiv-record/pulls/15
+[#19]: https://codeberg.org/nsxiv/nsxiv-record/pulls/19
+[#23]: https://codeberg.org/nsxiv/nsxiv-record/pulls/23
+[#31]: https://codeberg.org/nsxiv/nsxiv-record/pulls/31
+[#33]: https://codeberg.org/nsxiv/nsxiv-record/pulls/33
+[#41]: https://codeberg.org/nsxiv/nsxiv-record/pulls/41
+[#51]: https://codeberg.org/nsxiv/nsxiv-record/pulls/51
+[#53]: https://codeberg.org/nsxiv/nsxiv-record/pulls/53
+[#57]: https://codeberg.org/nsxiv/nsxiv-record/pulls/57
+
+
+sxiv
+----
+
+**Stable releases**
+
+**[v26](https://github.com/nsxiv/nsxiv/archive/v26.tar.gz)**
+*(January 16, 2020)*
+
+  * Maintenance release
+
+**[v25](https://github.com/nsxiv/nsxiv/archive/v25.tar.gz)**
+*(January 26, 2019)*
+
+  * Support font fallback for missing glyphs
+  * Fix busy loop when built without inotify
+  * Use background/foreground colors from X resource database
+
+**[v24](https://github.com/nsxiv/nsxiv/archive/v24.tar.gz)**
+*(October 27, 2017)*
+
+  * Automatically reload the current image whenever it changes
+  * Support embedding into other X windows with -e (e.g. tabbed)
+  * New option -p prevents sxiv from creating cache and temporary files
+  * Simpler mouse mappings, the most basic features are accessible with the
+    mouse only (navigate, zoom, pan)
+
+**[v1.3.2](https://github.com/nsxiv/nsxiv/archive/v1.3.2.tar.gz)**
+*(December 20, 2015)*
+
+  * external key handler gets file paths on stdin, not as arguments
+  * Cache out-of-view thumbnails in the background
+  * Apply gamma correction to thumbnails
+
+**[v1.3.1](https://github.com/nsxiv/nsxiv/archive/v1.3.1.tar.gz)**
+*(November 16, 2014)*
+
+  * Fixed build error, caused by delayed config.h creation
+  * Fixed segfault when run with -c
+
+**[v1.3](https://github.com/nsxiv/nsxiv/archive/v1.3.tar.gz)**
+*(October 24, 2014)*
+
+  * Extract thumbnails from EXIF tags (requires libexif)
+  * Zoomable thumbnails, supported sizes defined in config.h
+  * Fixed build error with giflib version >= 5.1.0
+
+**[v1.2](https://github.com/nsxiv/nsxiv/archive/v1.2.tar.gz)**
+*(April 24, 2014)*
+
+  * Added external key handler, called on keys prefixed with `Ctrl-x`
+  * New keybinding `{`/`}` to change gamma (by András Mohari)
+  * Support for slideshows, enabled with `-S` option & toggled with `s`
+  * Added application icon (created by 0ion9)
+  * Checkerboard background for alpha layer
+  * Option `-o` only prints files marked with `m` key
+  * Fixed rotation/flipping of multi-frame images (gifs)
+
+**[v1.1.1](https://github.com/nsxiv/nsxiv/archive/v1.1.1.tar.gz)**
+*(June 2, 2013)*
+
+  * Various bug fixes
+
+**[v1.1](https://github.com/nsxiv/nsxiv/archive/v1.1.tar.gz)**
+*(March 30, 2013)*
+
+  * Added status bar on bottom of window with customizable content
+  * New keyboard shortcuts `\`/`|`: flip image vertically/horizontally
+  * New keyboard shortcut `Ctrl-6`: go to last/alternate image
+  * Added own EXIF orientation handling, removed dependency on libexif
+  * Fixed various bugs
+
+**[v1.0](https://github.com/nsxiv/nsxiv/archive/v1.0.tar.gz)**
+*(October 31, 2011)*
+
+  * Support for multi-frame images & GIF animations
+  * POSIX compliant (IEEE Std 1003.1-2001)
+
+**[v0.9](https://github.com/nsxiv/nsxiv/archive/v0.9.tar.gz)**
+*(August 17, 2011)*
+
+  * Made key and mouse mappings fully configurable in config.h
+  * Complete code refactoring
+
+**[v0.8.2](https://github.com/nsxiv/nsxiv/archive/v0.8.2.tar.gz)**
+*(June 29, 2011)*
+
+  * POSIX-compliant Makefile; compiles under NetBSD
+
+**[v0.8.1](https://github.com/nsxiv/nsxiv/archive/v0.8.1.tar.gz)**
+*(May 8, 2011)*
+
+  * Fixed fullscreen under window managers, which are not fully EWMH-compliant
+
+**[v0.8](https://github.com/nsxiv/nsxiv/archive/v0.8.tar.gz)**
+*(April 18, 2011)*
+
+  * Support for thumbnail caching
+  * Ability to run external commands (e.g. jpegtran, convert) on current image
+
+**[v0.7](https://github.com/nsxiv/nsxiv/archive/v0.7.tar.gz)**
+*(February 26, 2011)*
+
+  * Sort directory entries when using `-r` command line option
+  * Hide cursor in image mode
+  * Full functional thumbnail mode, use Return key to switch between image and
+    thumbnail mode
+
+**[v0.6](https://github.com/nsxiv/nsxiv/archive/v0.6.tar.gz)**
+*(February 16, 2011)*
+
+  * Bug fix: Correctly display filenames with umlauts in window title
+  * Basic support of thumbnails
+
+**[v0.5](https://github.com/nsxiv/nsxiv/archive/v0.5.tar.gz)**
+*(February 6, 2011)*
+
+  * New command line option: `-r`: open all images in given directories
+  * New key shortcuts: `w`: resize image to fit into window; `W`: resize window
+    to fit to image
+
+**[v0.4](https://github.com/nsxiv/nsxiv/archive/v0.4.tar.gz)**
+*(February 1, 2011)*
+
+  * New command line option: `-F`, `-g`: use fixed window dimensions and apply
+    a given window geometry
+  * New key shortcut: `r`: reload current image
+
+**[v0.3.1](https://github.com/nsxiv/nsxiv/archive/v0.3.1.tar.gz)**
+*(January 30, 2011)*
+
+  * Bug fix: Do not set setuid bit on executable when using `make install`
+  * Pan image with mouse while pressing middle mouse button
+
+**[v0.3](https://github.com/nsxiv/nsxiv/archive/v0.3.tar.gz)**
+*(January 29, 2011)*
+
+  * New command line options: `-d`, `-f`, `-p`, `-s`, `-v`, `-w`, `-Z`, `-z`
+  * More mouse mappings: Go to next/previous image with left/right click,
+    scroll image with mouse wheel (horizontally if Shift key is pressed),
+    zoom image with mouse wheel if Ctrl key is pressed
+
+**[v0.2](https://github.com/nsxiv/nsxiv/archive/v0.2.tar.gz)**
+*(January 23, 2011)*
+
+  * Bug fix: Handle window resizes correctly
+  * New keyboard shortcuts: `g`/`G`: go to first/last image; `[`/`]`: go 10
+    images back/forward
+  * Support for mouse wheel zooming (by Dave Reisner)
+  * Added fullscreen mode
+
+**[v0.1](https://github.com/nsxiv/nsxiv/archive/v0.1.tar.gz)**
+*(January 21, 2011)*
+
+  * Initial release
diff --git a/etc/CONTRIBUTING.md b/etc/CONTRIBUTING.md
new file mode 100644
index 0000000..8d9680f
--- /dev/null
+++ b/etc/CONTRIBUTING.md
@@ -0,0 +1,97 @@
+Project Scope
+-------------
+
+  * Bug fixes and maintenance
+  * Prioritize extensibility and simplicity
+  * Do not make the codebase more complex, keep it simple to hack on
+  * Do not add extra dependency (if we do, add compile time switch to disable it)
+  * New features may be added if it cannot be achieved (easily) via a shell script,
+    doesn't break backwards compatibility and doesn't violate any of the above rules.
+
+Note: Since we aim to be a drop-in replacement for sxiv, we intend to keep all
+sxiv's behaviors/features even in cases where removing them would make the
+code-base simpler.
+
+Also note that (n)sxiv uses `imlib2` for loading images. Thus any request or
+patches for adding support for new image formats should go into
+[imlib2's repo](https://git.enlightenment.org/old/legacy-imlib2) instead.
+
+
+Contribution Guideline
+----------------------
+
+When contributing, make sure:
+
+  * Your contribution falls under nsxiv's scope and aim
+  * You follow the existing code style (see [.editorconfig](../.editorconfig))
+  * You open the pull request from a new branch, not from master
+  * To avoid using force pushes, especially for bigger patches. Only use them
+    when there's merge conflicts.
+
+If your contribution is not suitable for general use, it will not be included in nsxiv.
+For changes that are very much up to preference, such as changing values in config.h,
+please do not open a pull request unless you have an objective explanation.
+
+See the [open issues](https://codeberg.org/nsxiv/nsxiv/issues) to find something
+to work on. You can also filter the issues via label:
+
+* [Good first issue](https://codeberg.org/nsxiv/nsxiv/issues?labels=49698):
+  (Easy) Issues which do not require much if any experience.
+* [Up for grabs](https://codeberg.org/nsxiv/nsxiv/issues?labels=49705):
+  (Intermediate) Issues which are free for anyone who wants to pick it up.
+  Might require some experience.
+* [Help wanted](https://codeberg.org/nsxiv/nsxiv/issues?labels=49699):
+  (Intermediate/Experienced) Issues where we require some help.
+
+
+Development workflow for maintainers
+------------------------------------
+
+If we notice you contributing and/or showing interest in issues/pull requests,
+we may invite you to join the nsxiv org as a member. Being a member simply means
+you will be able to approve, disapprove and merge pull requests.
+
+Our workflow regarding pull requests is the following:
+
+  * Code related changes require two approvals, but documentation related
+    changes (e.g. typo) can be merged with just one.
+  * If a pull request has a single approval, no objections and has been open
+    for more than 7 days, then it may be force-merged.
+  * Always prefer squashing when merging. In the case a PR makes more than one
+    significant change, use the "don't squash" tag and rebase instead.
+  * When merging, make sure the commit message is cleaned up properly so that
+    it reflects the current intention of the PR.
+
+For releases, the process is the following:
+
+  * Tag the release with a "vN" tag, where N is the version number. Also set
+    the commit message and tag description for the release commit to "Release
+    version N". Make sure to use an annotated tag.
+  * Update `VERSION` macro in `config.mk`.
+  * Update the changelog (`etc/CHANGELOG.md`):
+    * Include link to the release tarball and add the release date.
+    * Document only the changes or fixes between releases. Don't document
+      changes which never made it into a release.
+    * Use the "Changes" section to document behavior changes since the last
+      release, the "Added" section for new features, and the "Fixes" section
+      for fixed bugs or regressions.
+    * Include pull request IDs with reference style links.
+
+Mirroring to GitHub:
+
+Assuming `origin` is the name of the codeberg remote and `github` is the name
+of the github remote; run the following commands to mirror the codeberg repo to
+github:
+
+```console
+$ git fetch --prune origin
+$ git push --prune github '+refs/remotes/origin/*:refs/heads/*' '+refs/tags/*:refs/tags/*'
+```
+
+The first command updates the local repo and the second command pushes
+everything on `origin` without pushing any of the local branches.
+
+- - -
+
+For mundane development related talks which don't warrant their own issue, use
+the [general discussion](https://codeberg.org/nsxiv/nsxiv/issues/294) thread.
diff --git a/etc/examples/image-info b/etc/examples/image-info
new file mode 100755
index 0000000..5f06123
--- /dev/null
+++ b/etc/examples/image-info
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/image-info
+# Called by nsxiv(1) whenever an image gets loaded.
+# The output is displayed in nsxiv's status bar.
+# Arguments:
+#   $1: path to image file (as provided by the user)
+#   $2: image width
+#   $3: image height
+#   $4: fully resolved path to the image file
+
+s="  " # field separator
+
+exec 2>/dev/null
+
+filename=$(basename -- "$1")
+filesize=$(du -Hh -- "$1" | cut -f 1)
+geometry="${2}x${3}"
+
+echo "${filesize}${s}${geometry}${s}${filename}"
+
diff --git a/etc/examples/key-handler b/etc/examples/key-handler
new file mode 100755
index 0000000..3fe741d
--- /dev/null
+++ b/etc/examples/key-handler
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/key-handler
+# Called by nsxiv(1) after the external prefix key (C-x by default) is pressed.
+# The next key combo is passed as its first argument. Passed via stdin are the
+# images to act upon: all marked images, if in thumbnail mode and at least one
+# image has been marked, otherwise the current image. nsxiv(1) will block until
+# the handler terminates. It then checks which images have been modified and
+# reloads them.
+
+# By default nsxiv(1) will send one image per-line to stdin, however when using
+# -0 the image list will be NULL separated and the environment variable
+# "$NSXIV_USING_NULL" will be set to 1.
+
+# The key combo argument has the following form: "[C-][M-][S-]KEY",
+# where C/M/S indicate Ctrl/Meta(Alt)/Shift modifier states and KEY is the X
+# keysym as listed in /usr/include/X11/keysymdef.h without the "XK_" prefix.
+# If KEY has an uppercase equivalent, S-KEY is resolved into it. For instance,
+# K replaces S-k and Scedilla replaces S-scedilla, but S-Delete is sent as-is.
+
+rotate() {
+	degree="$1"
+	tr '\n' '\0' | xargs -0 realpath | sort | uniq | while read file; do
+		case "$(file -b -i "$file")" in
+		image/jpeg*) jpegtran -rotate "$degree" -copy all -outfile "$file" "$file" ;;
+		*)           mogrify  -rotate "$degree" "$file" ;;
+		esac
+	done
+}
+
+case "$1" in
+"C-x")      xclip -in -filter | tr '\n' ' ' | xclip -in -selection clipboard ;;
+"C-c")      while read file; do xclip -selection clipboard -target image/png "$file"; done ;;
+"C-e")      while read file; do urxvt -bg "#444" -fg "#eee" -sl 0 -title "$file" -e sh -c "exiv2 pr -q -pa '$file' | less" & done ;;
+"C-g")      tr '\n' '\0' | xargs -0 gimp & ;;
+"C-r")      while read file; do rawtherapee "$file" & done ;;
+"C-comma")  rotate 270 ;;
+"C-period") rotate  90 ;;
+"C-slash")  rotate 180 ;;
+esac
+
diff --git a/etc/examples/thumb-info b/etc/examples/thumb-info
new file mode 100755
index 0000000..b422f9c
--- /dev/null
+++ b/etc/examples/thumb-info
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/thumb-info
+# Called by nsxiv(1) whenever the selected thumbnail changes.
+# The output is displayed in nsxiv's status bar.
+# Arguments:
+#   $1: path to image file (as provided by the user)
+#   $2: empty
+#   $3: empty
+#   $4: fully resolved path to the image file
+
+s="  " # field separator
+
+exec 2>/dev/null
+
+filename=$(basename -- "$4")
+filesize=$(du -Hh -- "$4" | cut -f 1)
+
+echo "${filesize}${s}${filename}"
+
diff --git a/etc/examples/win-title b/etc/examples/win-title
new file mode 100755
index 0000000..31994ef
--- /dev/null
+++ b/etc/examples/win-title
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/win-title
+# Called by nsxiv(1) whenever any of the relevant information changes.
+# The output is set as nsxiv's window title.
+#
+# Arguments, "Optional" arguments might be empty:
+#   $1: resolved absolute path of the current file
+#   $2: current file number
+#   $3: total file number
+#   $4: image width (Optional: Disabled on thumbnails mode)
+#   $5: image height (Optional: Disabled on thumbnails mode)
+#   $6: current zoom (Optional: Disabled on thumbnails mode)
+#
+# The term file is used rather than image as nsxiv does not
+# precheck that the input files are valid images. Total file
+# count may be different from the actual count of valid images.
+
+exec 2>/dev/null
+
+filename="${1##*/}"
+
+if [ -n "$4" ]; then # image mode
+	printf "%s" "nsxiv - ${filename} | ${4}x${5} ${6}% [${2}/${3}]"
+else
+	printf "%s" "nsxiv - ${filename} [${2}/${3}]"
+fi
diff --git a/etc/nsxiv.1 b/etc/nsxiv.1
new file mode 100644
index 0000000..f4801b0
--- /dev/null
+++ b/etc/nsxiv.1
@@ -0,0 +1,565 @@
+.TH NSXIV 1 nsxiv\-VERSION
+.SH NAME
+nsxiv \- Neo Simple X Image Viewer
+.SH SYNOPSIS
+.B nsxiv
+.RB [ \-abcfhiopqrtvZ0 ]
+.RB [ \-A
+.IR FRAMERATE ]
+.RB [ \-e
+.IR WID ]
+.RB [ \-G
+.IR GAMMA ]
+.RB [ \-g
+.IR GEOMETRY ]
+.RB [ \-N
+.IR NAME ]
+.RB [ \-n
+.IR NUM ]
+.RB [ \-S
+.IR DELAY ]
+.RB [ \-s
+.IR MODE ]
+.RB [ \-z
+.IR ZOOM ]
+.IR FILE ...
+.SH DESCRIPTION
+nsxiv is a simple image viewer for X.
+.P
+It has two modes of operation: image and thumbnail mode. The default is image
+mode, in which only the current image is shown. In thumbnail mode a grid of
+small previews is displayed, making it easy to choose an image to open.
+.P
+Please note, that the fullscreen mode requires an EWMH/NetWM-compliant window
+manager.
+.SH OPTIONS
+.TP
+.BI "\-A " FRAMERATE
+Play animations with a constant frame rate set to
+.IR FRAMERATE .
+.TP
+.B \-a
+Play animations of multi-frame images.
+.TP
+.B \-b
+Do not show statusbar at the bottom of the window.
+.TP
+.B \-c
+Remove all orphaned cache files from the thumbnail cache directory and exit.
+.TP
+.BI "\-e " WID
+Embed nsxiv's window into window whose ID is
+.IR WID .
+.TP
+.B \-f
+Start in fullscreen mode.
+.TP
+.BI "\-G " GAMMA
+Set image gamma to GAMMA (\-32..32).
+.TP
+.BI "\-g " GEOMETRY
+Set window position and size. See section GEOMETRY SPECIFICATIONS of X(7) for
+more information on GEOMETRY argument.
+.TP
+.BI "\-N " NAME
+Set the resource name of nsxiv's X window to NAME.
+.TP
+.BI "\-n " NUM
+Start at picture number NUM.
+.TP
+.B \-h
+Print brief usage information to standard output and exit.
+.TP
+.B \-i
+Read names of files to open from standard input. Also done if FILE is `-'.
+.TP
+.B \-o
+Write list of all marked files to standard output when quitting. In combination
+with
+.B \-i
+nsxiv can be used as a visual filter/pipe.
+.TP
+.B \-p
+Enable private mode, in which nsxiv does not write any cache or temporary files.
+.TP
+.B \-q
+Be quiet, and disable warnings to standard error stream.
+.TP
+.B \-r
+Search the given directories recursively for images to view.
+.TP
+.BI "\-S " DELAY
+Start in slideshow mode. Set the delay between images to
+.I DELAY
+seconds.
+.I DELAY
+may be a floating-point number.
+.TP
+.BI "\-s " MODE
+Set scale mode according to MODE character. Supported modes are: [d]own,
+[f]it, [F]ill, [w]idth, [h]eight.
+.TP
+.B \-t
+Start in thumbnail mode.
+.TP
+.B \-v
+Print version information to standard output and exit.
+.TP
+.B \-Z
+The same as `\-z 100'.
+.TP
+.BI "\-z " ZOOM
+Set zoom level to ZOOM percent.
+.TP
+.B \-0
+Use NULL-separator. With this option, output of \-o and file-list sent to the
+key-handler and the input of \-i will be separated by a NULL character.
+.SH KEYBOARD COMMANDS
+.SS General
+The following keyboard commands are available in both image and thumbnail modes:
+.TP
+.BR 0 \- 9
+Prefix the next command with a number (denoted via
+.IR count ).
+.TP
+.B q
+Quit nsxiv.
+.TP
+.B Return
+Switch to thumbnail mode / open selected image in image mode.
+.TP
+.B f
+Toggle fullscreen mode.
+.TP
+.B b
+Toggle visibility of statusbar at the bottom of the window.
+.TP
+.B Ctrl-x
+Send the next key to the external key-handler. See section EXTERNAL KEY HANDLER
+for more information.
+.TP
+.B g
+Go to the first image.
+.TP
+.B G
+Go to the last image, or image number
+.IR count .
+.TP
+.B r
+Reload image.
+.TP
+.B D
+Remove current image from file list and go to next image.
+.TP
+.BR Ctrl-h ", " Ctrl-Left
+Scroll left one screen width.
+.TP
+.BR Ctrl-j ", " Ctrl-Down
+Scroll down one screen height.
+.TP
+.BR Ctrl-k ", " Ctrl-Up
+Scroll up one screen height.
+.TP
+.BR Ctrl-l ", " Ctrl-Right
+Scroll right one screen width.
+.TP
+.BR +
+Zoom in.
+.TP
+.B \-
+Zoom out.
+.TP
+.B m
+Mark/unmark the current image.
+.TP
+.B M
+Mark/unmark all images starting from the last marked/unmarked image up to the
+current one.
+.TP
+.B Ctrl-m
+Reverse all image marks.
+.TP
+.B Ctrl-u
+Remove all image marks.
+.TP
+.B N
+Go
+.I count
+marked images forward.
+.TP
+.B P
+Go
+.I count
+marked images backward.
+.TP
+.B {
+Decrease gamma correction by
+.I count
+steps.
+.TP
+.B }
+Increase gamma correction by
+.I count
+steps.
+.TP
+.B Ctrl-g
+Reset gamma correction.
+.SS Thumbnail mode
+The following keyboard commands are only available in thumbnail mode:
+.TP
+.BR h ", " Left
+Move selection left
+.I count
+times.
+.TP
+.BR j ", " Down
+Move selection down
+.I count
+times.
+.TP
+.BR k ", " Up
+Move selection up
+.I count
+times.
+.TP
+.BR l ", " Right
+Move selection right
+.I count
+times.
+.TP
+.B R
+Reload all thumbnails.
+.SS Image mode
+The following keyboard commands are only available in image mode:
+.TP
+Navigate image list:
+.TP
+.BR n ", " Space
+Go
+.I count
+images forward.
+.TP
+.BR p ", " Backspace
+Go
+.I count
+images backward.
+.TP
+.B [
+Go
+.I count
+* 10 images backward.
+.TP
+.B ]
+Go
+.I count
+* 10 images forward.
+.TP
+.B Ctrl-6
+Go to the previously viewed image.
+.TP
+Handle multi-frame images:
+.TP
+.B Ctrl-n
+Go
+.I count
+frames of a multi-frame image forward.
+.TP
+.B Ctrl-p
+Go
+.I count
+frames of a multi-frame image backward.
+.TP
+.BR Ctrl-a ", " Ctrl-Space
+Play/stop animations of multi-frame images.
+.TP
+Panning:
+.TP
+.BR h ", " Left
+Scroll image 1/5 of window width or
+.I count
+pixels left.
+.TP
+.BR j ", " Down
+Scroll image 1/5 of window height or
+.I count
+pixels down.
+.TP
+.BR k ", " Up
+Scroll image 1/5 of window height or
+.I count
+pixels up.
+.TP
+.BR l ", " Right
+Scroll image 1/5 of window width or
+.I count
+pixels right.
+.TP
+.B H
+Scroll to left image edge.
+.TP
+.B J
+Scroll to bottom image edge.
+.TP
+.B K
+Scroll to top image edge.
+.TP
+.B L
+Scroll to right image edge.
+.TP
+.B z
+Scroll to image center.
+.TP
+Zooming:
+.TP
+.B =
+Set zoom level to 100%, or
+.IR count %.
+.TP
+.B w
+Set zoom level to 100%, but fit large images into window.
+.TP
+.B W
+Fit image to window.
+.TP
+.B F
+Fill image to window.
+.TP
+.B e
+Fit image to window width.
+.TP
+.B E
+Fit image to window height.
+.TP
+Rotation:
+.TP
+.B <
+Rotate image counter-clockwise by 90 degrees.
+.TP
+.B >
+Rotate image clockwise by 90 degrees.
+.TP
+.B ?
+Rotate image by 180 degrees.
+.TP
+Flipping:
+.TP
+.B |
+Flip image horizontally.
+.TP
+.B _
+Flip image vertically.
+.TP
+Miscellaneous:
+.TP
+.B a
+Toggle anti-aliasing.
+.TP
+.B A
+Toggle visibility of alpha-channel, i.e. image transparency.
+.TP
+.B s
+Toggle slideshow mode and/or set the delay between images to
+.I count
+seconds.
+.SH MOUSE COMMANDS
+.SS Thumbnail mode
+The following mouse mappings are available in thumbnail mode:
+.TP
+.B Button1
+Select the image. Goes into image mode if double\-clicked.
+.TP
+.B Button3
+Mark/unmark the image. Dragging while holding down Button3 will mark/unmark
+multiple images.
+.TP
+.B Button4
+Scroll up by one row.
+.TP
+.B Button5
+Scroll down by one row.
+.TP
+.B Ctrl-Button4
+Scroll up by one page.
+.TP
+.B Ctrl-Button5
+Scroll down by one page.
+.SS Image mode
+The following mouse mappings are available in image mode:
+.TP
+.B Button1
+Go to the next image if the mouse cursor is in the right part of the window or
+to the previous image if it is in the left part.
+.TP
+.B Ctrl-Button1
+Pan the image relative to the mouse cursor.
+.TP
+.B Button2
+Pan the image according to the mouse cursor position in the window while
+keeping this button pressed down.
+.TP
+.B Button3
+Switch to thumbnail mode.
+.TP
+.B Button4
+Zoom in.
+.TP
+.B Button5
+Zoom out.
+.SH CONFIGURATION
+The following X resources are supported:
+.TP
+.B window.background
+Color of the window background
+.TP
+.B window.foreground
+Color of the window foreground
+.TP
+.B bar.font
+Name of Xft bar font
+.TP
+.B bar.background
+Color of the bar background. Defaults to window.background
+.TP
+.B bar.foreground
+Color of the bar foreground. Defaults to window.foreground
+.TP
+.B mark.foreground
+Color of the mark foreground. Defaults to window.foreground
+.TP
+Please see xrdb(1) on how to change them.
+.SH WINDOW TITLE
+The window title can be replaced with the output of a user-provided script,
+which is called by nsxiv whenever any of the relevant information changes.
+The path of this script is
+.I $XDG_CONFIG_HOME/nsxiv/exec/win-title
+and the arguments given to it (where "Optional" arguments might be empty) are:
+.IP $1 4
+resolved absolute path of the current file
+.IP $2 4
+current file number
+.IP $3 4
+total file count
+.IP $4 4
+image width (Optional: Disabled on thumbnails mode)
+.IP $5 4
+image height (Optional: Disabled on thumbnails mode)
+.IP $6 4
+current zoom (Optional: Disabled on thumbnails mode)
+.P
+The term file is used rather than image as nsxiv does not precheck that the
+input files are valid images. Total file count may be different from the actual
+count of valid images.
+.P
+There is also an example script installed together with nsxiv as
+.IR EGPREFIX/win-title .
+.SH STATUS BAR
+The information displayed on the left side of the status bar can be replaced
+with the output of user-provided script.
+.P
+The script that is called by nsxiv whenever an image gets loaded is located at
+.I $XDG_CONFIG_HOME/nsxiv/exec/image-info
+and the arguments given to it are:
+.IP $1 4
+path to image file (as provided by the user)
+.IP $2 4
+image width
+.IP $3 4
+image height
+.IP $4 4
+fully resolved path to the image file
+.P
+In thumbnail mode, the script that is called is located at
+.I $XDG_CONFIG_HOME/nsxiv/exec/thumb-info
+and the arguments given to it are:
+.IP $1 4
+path to image file (as provided by the user)
+.IP $2 4
+empty
+.IP $3 4
+empty
+.IP $4 4
+fully resolved path to the image file
+.P
+There are also example scripts installed together with nsxiv as
+.IR EGPREFIX/image-info
+and
+.IR EGPREFIX/thumb-info .
+.SH EXTERNAL KEY HANDLER
+Additional external keyboard commands can be defined using a handler program
+located in
+.IR $XDG_CONFIG_HOME/nsxiv/exec/key-handler .
+The handler is invoked by pressing
+.BR Ctrl-x .
+The next key combo is passed as its first argument. Passed via stdin are the
+images to act upon: all marked images, if in thumbnail mode and at least one
+image has been marked, otherwise the current image. nsxiv(1) will block until
+the handler terminates. It then checks which images have been modified and
+reloads them.
+
+By default nsxiv(1) will send one image per-line to stdin, however when using
+\-0 the image list will be NULL separated and the environment variable
+"$NSXIV_USING_NULL" will be set to 1.
+
+The key combo argument has the following form: "[C-][M-][S-]KEY",
+where C/M/S indicate Ctrl/Meta(Alt)/Shift modifier states and KEY is the X
+keysym as listed in /usr/include/X11/keysymdef.h without the "XK_" prefix.
+If KEY has an uppercase equivalent, S-KEY is resolved into it. For instance,
+K replaces S-k and Scedilla replaces S-scedilla, but S-Delete is sent as-is.
+
+There is also an example script installed together with nsxiv as
+.IR EGPREFIX/key-handler .
+.SH THUMBNAIL CACHING
+nsxiv stores all thumbnails under
+.IR $XDG_CACHE_HOME/nsxiv/ .
+.P
+Use the command line option
+.I \-c
+to remove all orphaned cache files. Additionally, run the following command
+afterwards inside the cache directory to remove empty subdirectories:
+.P
+.RS
+find . \-depth \-type d \-empty ! \-name '.' \-exec rmdir {} \\;
+.RE
+.SH ORIGINAL AUTHOR
+.EX
+Bert Muennich          <ber.t at posteo.de>
+.EE
+.SH CURRENT MAINTAINERS
+.EX
+N-R-K                  <nrk at disroot.org>
+Berke Kocaoğlu         <berke.kocaoglu at metu.edu.tr>
+TAAPArthur             <taaparthur at gmail.com>
+eylles                 <ed.ylles1997 at gmail.com>
+mamg22                 <marcomonizg at gmail.com>
+LuXu
+explosion-mental       <explosion0mental at gmail.com>
+Guilherme Freire
+Stein Gunnar Bakkeby   <bakkeby at gmail.com>
+Anupam Ashish Minz
+Sam Whitehead
+Kian Kasad             <kian at kasad.com>
+qsmodo
+.EE
+.SH CONTRIBUTORS
+.EX
+Bastien Dejean         <nihilhill at gmail.com>
+Dave Reisner           <d at falconindy.com>
+Fung SzeTat            <sthorde at gmail.com>
+Max Voit               <mvdev at with-eyes.net>
+
+For additional contributors, run `git shortlog -s` in the nsxiv repository.
+.EE
+.SH HOMEPAGE
+.TP
+Website:
+.EE
+https://nsxiv.codeberg.page/
+.EX
+.TP
+Source code:
+.EE
+https://codeberg.org/nsxiv/nsxiv
+.EX
+.SH SEE ALSO
+.BR X (7),
+.BR xrdb (1)
diff --git a/etc/nsxiv.desktop b/etc/nsxiv.desktop
new file mode 100644
index 0000000..de90437
--- /dev/null
+++ b/etc/nsxiv.desktop
@@ -0,0 +1,8 @@
+[Desktop Entry]
+Type=Application
+Name=nsxiv
+GenericName=Image Viewer
+Exec=nsxiv %F
+MimeType=image/bmp;image/gif;image/jpeg;image/jpg;image/png;image/tiff;image/x-bmp;image/x-portable-anymap;image/x-portable-bitmap;image/x-portable-graymap;image/x-tga;image/x-xpixmap;image/webp;image/heic;image/svg+xml;application/postscript;image/jp2;image/jxl;image/avif;image/heif;
+NoDisplay=true
+Icon=nsxiv
diff --git a/etc/woodpecker/CFLAGS b/etc/woodpecker/CFLAGS
new file mode 100644
index 0000000..57d7d16
--- /dev/null
+++ b/etc/woodpecker/CFLAGS
@@ -0,0 +1,13 @@
+# vanilla flags
+-std=c99 -Wall -pedantic
+# optimizations: enables extra warnings and deeper analysis thus catches more errors/warnings
+-O3 -flto
+# treat warnings as errors
+-Werror
+# extra flags
+-Wextra -Wshadow -Wvla -Wpointer-arith
+-Wundef -Wstrict-overflow=4 -Wwrite-strings -Wunreachable-code
+-Wbad-function-cast -Wdeclaration-after-statement
+-Wmissing-prototypes -Wstrict-prototypes
+# silence
+-Wno-unused-parameter -Wno-missing-field-initializers
diff --git a/etc/woodpecker/analysis.yml b/etc/woodpecker/analysis.yml
new file mode 100644
index 0000000..35cef7f
--- /dev/null
+++ b/etc/woodpecker/analysis.yml
@@ -0,0 +1,28 @@
+branches: master
+
+pipeline:
+  analysis:
+    image: alpine
+    commands: |
+      apk add --no-cache build-base cppcheck clang-extra-tools \
+          imlib2-dev xorgproto \
+          libxft-dev libexif-dev giflib-dev libwebp-dev >/dev/null
+      make config.h version.h
+      std="c99"
+      run_cppcheck() {
+        cppcheck --std="$std" --enable=performance,portability \
+          --force --quiet --inline-suppr --error-exitcode=1 \
+          --max-ctu-depth=8 -j"$(nproc)" \
+          $(make OPT_DEP_DEFAULT="$1" dump_cppflags) \
+          --suppress=varFuncNullUB --suppress=uninitvar \
+          *.c
+      }
+      run_tidy() {
+        checks="$(sed '/^#/d' etc/woodpecker/clang-tidy-checks | paste -d ',' -s)"
+        clang-tidy --warnings-as-errors="*" --checks="$checks" --quiet *.c \
+                   -- -std="$std" $(make OPT_DEP_DEFAULT="$1" dump_cppflags)
+      }
+      run_cppcheck "0"
+      run_cppcheck "1"
+      run_tidy "0"
+      run_tidy "1"
diff --git a/etc/woodpecker/build.yml b/etc/woodpecker/build.yml
new file mode 100644
index 0000000..603fa0e
--- /dev/null
+++ b/etc/woodpecker/build.yml
@@ -0,0 +1,28 @@
+branches: master
+
+# NOTE: "stable" tcc is too old and fails at linking. instead fetching a recent known working commit.
+pipeline:
+  build:
+    image: alpine
+    environment:
+      - TCC_SHA=027b8fb9b88fe137447fb8bb1b61079be9702472
+    commands: |
+      apk add --no-cache \
+          imlib2 imlib2-dev xorgproto \
+          libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev \
+          gcc clang llvm llvm-dev build-base wget ca-certificates >/dev/null
+      wget "https://github.com/TinyCC/tinycc/archive/$TCC_SHA.tar.gz" >/dev/null
+      tar xzf "$TCC_SHA.tar.gz" >/dev/null
+      ( cd "tinycc-$TCC_SHA" && ./configure --config-musl && make -s -j"$(nproc)" && make install; ) >/dev/null
+      CFLAGS="$(sed '/^#/d' etc/woodpecker/CFLAGS | paste -d ' ' -s)"
+      build () {
+        for cc in "gcc" "clang" "tcc"; do
+          echo "### $cc - $2 build ###"
+          make clean && make -s -j"$(nproc)" CC="$cc" CFLAGS="$CFLAGS" LDFLAGS="$CFLAGS" OPT_DEP_DEFAULT="$1"
+        done
+      }
+      # full-build #
+      build "1" "full"
+      # ensure minimal-build works without opt deps installed
+      apk del libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev >/dev/null
+      build "0" "minimal"
diff --git a/etc/woodpecker/clang-tidy-checks b/etc/woodpecker/clang-tidy-checks
new file mode 100644
index 0000000..3c6c62e
--- /dev/null
+++ b/etc/woodpecker/clang-tidy-checks
@@ -0,0 +1,17 @@
+# checks
+clang-analyzer-*,clang-diagnostic-*,bugprone-*,performance-*,modernize-*
+misc-*,readability-*,android-cloexec-*,cert-*
+llvm-include-order
+
+# silence
+-misc-unused-parameters
+-bugprone-easily-swappable-parameters,-bugprone-narrowing-conversions,-bugprone-incorrect-roundings
+-bugprone-implicit-widening-of-multiplication-result,-bugprone-integer-division
+-readability-braces-around-statements,-readability-magic-numbers,-readability-isolate-declaration
+-readability-function-cognitive-complexity,-readability-else-after-return
+-readability-uppercase-literal-suffix,-readability-avoid-const-params-in-decls
+-android-cloexec-fopen,-android-cloexec-pipe
+
+# false positive warnings
+-clang-analyzer-valist.Uninitialized
+-misc-no-recursion
diff --git a/etc/woodpecker/spell.yml b/etc/woodpecker/spell.yml
new file mode 100644
index 0000000..a184092
--- /dev/null
+++ b/etc/woodpecker/spell.yml
@@ -0,0 +1,9 @@
+branches: master
+
+# NOTE: codespell not available on stable alpine, use edge
+pipeline:
+  spell-check:
+    image: alpine:edge
+    commands: |
+      apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing py3-codespell git >/dev/null
+      git ls-files | sed '/\.png$/d' | xargs codespell