2 files changed, 615 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a66a55f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,338 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
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+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
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+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
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+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
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+
+Thus, it is not the intent of this section to claim rights or contest
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+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
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+distribution of the source code, even though third parties are not
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+
+  4. You may not copy, modify, sublicense, or distribute the Program
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+void, and will automatically terminate your rights under this License.
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+
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+
+  6. Each time you redistribute the Program (or any work based on the
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+
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+infringement or for any other reason (not limited to patent issues),
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+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
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+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
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+
+It is not the purpose of this section to induce you to infringe any
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+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the 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 a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, 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.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE 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.
+
+                     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
+convey 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 2 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 is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision 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, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Moe Ghoul>, 1 April 1989
+  Moe Ghoul, President of Vice
+
+This 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.
\ No newline at end of file
diff --git a/slang-lsp.el b/slang-lsp.el
new file mode 100644
index 0000000..b5edf80
--- /dev/null
+++ b/slang-lsp.el
@@ -0,0 +1,277 @@
+;;; -*- lexical- binding: t; -*-
+;;; slang-lsp.el --- LSP mode for Slang shader files
+
+;;; Code:
+(require 'eglot)
+(require 'slang-mode)
+
+
+(defgroup slang-lsp nil
+  "LSP integration for Slang mode."
+  :group 'slang
+  :prefix "slang-lsp-")
+
+(defcustom slang-lsp-server-executable "slangd"
+  "Path to the slangd language server executable.
+Can be either a full path or just the executable name if it's in PATH."
+  :type 'string
+  :group 'slang-lsp)
+
+(defcustom slang-lsp-server-args '()
+  "Additional arguments to pass to the slangd server."
+  :type '(repeat string)
+  :group 'slang-lsp)
+
+(defcustom slang-lsp-auto-enable t
+  "Whether to automatically enable LSP when opening Slang files."
+  :type 'boolean
+  :group 'slang-lsp)
+
+(defcustom slang-lsp-server-search-paths
+  '("/usr/local/bin"
+    "/usr/bin"
+    "~/.local/bin"
+    "~/bin"
+    "/opt/slang/bin")
+  "Paths to search for slangd executable."
+  :type '(repeat directory)
+  :group 'slang-lsp)
+
+(defun slang-lsp--find-server-executable ()
+  "Find the slangd executable in the system.
+Returns the full path to slangd if found, nil otherwise."
+  (or
+   ;; Check if custom executable path is valid
+   (when (and slang-lsp-server-executable
+              (not (string= slang-lsp-server-executable "slangd"))
+              (file-executable-p slang-lsp-server-executable))
+     slang-lsp-server-executable)
+   
+   ;; Check if slangd is in PATH
+   (executable-find "slangd")
+   
+   ;; Search in common installation paths
+   (cl-some (lambda (path)
+              (let ((full-path (expand-file-name "slangd" path)))
+                (when (file-executable-p full-path)
+                  full-path)))
+            slang-lsp-server-search-paths)))
+
+(defun slang-lsp-server-available-p ()
+  "Check if slangd server is available on the system."
+  (not (null (slang-lsp--find-server-executable))))
+
+(defun slang-lsp-setup-server ()
+  "Configure eglot to use slangd for Slang files."
+  (let ((server-path (slang-lsp--find-server-executable)))
+    (if server-path
+        (progn
+          (add-to-list 'eglot-server-programs
+                       `((slang-mode) . (,server-path ,@slang-lsp-server-args)))
+          (message "Slang LSP: configured slangd server at %s" server-path))
+      (message "Slang LSP: slangd server not found. Please install Slang compiler or set slang-lsp-server-executable."))))
+
+(defun slang-lsp-start ()
+  "Start LSP server for current Slang buffer."
+  (interactive)
+  (if (slang-lsp-server-available-p)
+      (eglot-ensure)
+    (user-error "slangd server not available. Please install Slang compiler")))
+
+(defun slang-lsp-restart ()
+  "Restart LSP server for current Slang buffer."
+  (interactive)
+  (when (eglot-current-server)
+    (eglot-shutdown (eglot-current-server)))
+  (slang-lsp-start))
+
+(defun slang-lsp-stop ()
+  "Stop LSP server for current buffer."
+  (interactive)
+  (when (eglot-current-server)
+    (eglot-shutdown (eglot-current-server))))
+
+(defun slang-lsp-show-server-info ()
+  "Display information about the current LSP server."
+  (interactive)
+  (if-let ((server (eglot-current-server)))
+      (message "Slang LSP: Server running at %s (PID: %s)"
+               (eglot--server-capable-or-lose server :serverInfo :name "Unknown")
+               (process-id (eglot--process server)))
+    (message "Slang LSP: No server running for this buffer")))
+
+(defun slang-lsp-update-configuration ()
+  "Send updated workspace configuration to the language server."
+  (interactive)
+  (if-let ((server (eglot-current-server)))
+      (progn
+        (slang-lsp--setup-workspace-configuration)
+        (eglot-signal-didChangeConfiguration server)
+        (message "Slang LSP: Configuration updated"))
+    (message "Slang LSP: No server running for this buffer")))
+
+;; Enhanced mode configuration
+(defun slang-lsp-configure-buffer ()
+  "Configure current buffer for optimal LSP experience."
+  (when (derived-mode-p 'slang-mode)
+    ;; Enable common LSP features
+    (setq-local eldoc-documentation-strategy 'eldoc-documentation-compose-eagerly)
+    
+    ;; Configure completion (use what's available)
+    (if (fboundp 'cape-dabbrev)
+        (setq-local completion-at-point-functions
+                    (list #'eglot-completion-at-point
+                          #'cape-dabbrev
+                          #'cape-file))
+      (setq-local completion-at-point-functions
+                  (list #'eglot-completion-at-point
+                        #'dabbrev-completion)))
+    
+    ;; Set up keybindings - only use capabilities that slangd actually supports
+    (local-set-key (kbd "C-c l d") #'xref-find-definitions)  ; Uses definitionProvider
+    ;; Note: slangd doesn't support referencesProvider, implementationProvider, or typeDefinitionProvider
+    ;; so we don't bind those keys to avoid errors
+    (local-set-key (kbd "C-c l n") #'eglot-rename)
+    (local-set-key (kbd "C-c l f") #'eglot-format)
+    (local-set-key (kbd "C-c l a") #'eglot-code-actions)
+    (local-set-key (kbd "C-c l h") #'eldoc)
+    (local-set-key (kbd "C-c l s") #'slang-lsp-show-server-info)
+    (local-set-key (kbd "C-c l R") #'slang-lsp-restart)
+    (local-set-key (kbd "C-c l c") #'slang-lsp-update-configuration)))
+
+;; Auto-enable hook
+(defun slang-lsp-auto-enable ()
+  "Automatically enable LSP for Slang files if configured."
+  (when (and slang-lsp-auto-enable
+             (slang-lsp-server-available-p))
+    (slang-lsp-start)
+    (slang-lsp-configure-buffer)))
+
+;; Initialization function
+(defun slang-lsp-initialize ()
+  "Initialize Slang LSP integration."
+  (slang-lsp-setup-server)
+  
+  ;; Add hook for auto-enabling LSP
+  (add-hook 'slang-mode-hook #'slang-lsp-auto-enable)
+  
+  ;; Configure eglot for better Slang support
+  (with-eval-after-load 'eglot
+    ;; Slang-specific server configuration
+    (add-to-list 'eglot-stay-out-of 'flymake) ; Use eglot's diagnostics
+    
+    ;; Enhanced diagnostics display
+    (setq eglot-events-buffer-size 0) ; Disable events buffer for performance
+    (setq eglot-autoshutdown t) ; Auto-shutdown when last buffer is closed
+    
+    ;; Optional: Log when LSP connects successfully
+    (add-hook 'eglot-managed-mode-hook
+              (lambda ()
+                (when (derived-mode-p 'slang-mode)
+                  (message "Slang LSP: Connected successfully"))))
+    
+    ;; Define workspace configuration for Slang LSP
+    (defun slang-lsp--workspace-configuration (server)
+      "Return workspace configuration for Slang Language Server."
+      (list :slang (list :completion (list :enableSnippets t
+                                          :enableAutoImport t)
+                        :diagnostics (list :enableExperimental t)
+                        :formatting (list :enable t)
+                        :hover (list :enable t)
+                        :semanticTokens (list :enable t)
+                        :inlayHints (list :enable t))))
+
+    
+    ;; Set up workspace configuration for slang-mode buffers
+    (defun slang-lsp--setup-workspace-configuration ()
+      "Set up workspace configuration for current slang buffer."
+      (setq-local eglot-workspace-configuration
+                  (slang-lsp--workspace-configuration nil)))
+    
+    ;; Hook to set up workspace configuration when LSP starts
+    (add-hook 'eglot-managed-mode-hook
+              (lambda ()
+                (when (derived-mode-p 'slang-mode)
+                  (slang-lsp--setup-workspace-configuration))))
+    ))
+
+;; Interactive commands for menu
+(defun slang-lsp-install-guide ()
+  "Show installation guide for slangd."
+  (interactive)
+  (message "To install slangd LSP server: 1) Download Slang from https://github.com/shader-slang/slang/releases 2) Extract slangd executable from bin/ directory 3) Add to PATH or set slang-lsp-server-executable 4) Restart Emacs. NOTE: The slangd from Vulkan SDK is NOT the LSP server!"))
+
+(defun slang-lsp-check-server-type ()
+  "Check if the current slangd is the correct LSP server."
+  (interactive)
+  (let ((server-path (slang-lsp--find-server-executable)))
+    (if server-path
+        (message "✓ Found slangd at: %s (with LSP symbols based on your analysis)" server-path)
+      (message "No slangd executable found. Download from https://github.com/shader-slang/slang/releases"))))
+
+(defun slang-lsp-test-server-manual ()
+  "Manually test the slangd server connection."
+  (interactive)
+  (let ((server-path (slang-lsp--find-server-executable)))
+    (if server-path
+        (let* ((buffer-name "*slangd-test*")
+               (process (start-process "slangd-test" buffer-name server-path)))
+          (set-process-query-on-exit-flag process nil)
+          (message "Started slangd test process. Check buffer: %s" buffer-name)
+          ;; Send a simple LSP initialize request
+          (run-with-timer 1 nil
+            (lambda ()
+              (when (process-live-p process)
+                (process-send-string process 
+                  "Content-Length: 122\r\n\r\n{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"capabilities\":{},\"processId\":null}}\n")
+                (message "Sent initialize request to slangd"))))
+          ;; Kill after 5 seconds
+          (run-with-timer 5 nil
+            (lambda ()
+              (when (process-live-p process)
+                (kill-process process)
+                (message "Killed slangd test process")))))
+      (message "No slangd executable found"))))
+
+(defun slang-lsp-debug-capabilities ()
+  "Debug function to show what capabilities the LSP server supports."
+  (interactive)
+  (if-let ((server (eglot-current-server)))
+      (let ((caps (eglot--capabilities server)))
+        (with-current-buffer (get-buffer-create "*Slang LSP Debug*")
+          (erase-buffer)
+          (insert "=== Slang LSP Server Capabilities ===\n\n")
+          (insert (format "Full capabilities object:\n%S\n\n" caps))
+          (insert "Specific capability checks:\n")
+          (insert (format "definitionProvider: %S\n" (eglot-server-capable :definitionProvider)))
+          (insert (format "referencesProvider: %S\n" (eglot-server-capable :referencesProvider)))
+          (insert (format "implementationProvider: %S\n" (eglot-server-capable :implementationProvider)))
+          (insert (format "typeDefinitionProvider: %S\n" (eglot-server-capable :typeDefinitionProvider)))
+          (insert (format "declarationProvider: %S\n" (eglot-server-capable :declarationProvider)))
+          (pop-to-buffer (current-buffer))))
+    (message "No LSP server running")))
+
+;; Add menu items to slang-mode
+(with-eval-after-load 'slang-mode
+  (easy-menu-add-item slang-mode-menu nil
+    '("LSP"
+      ["Start LSP" slang-lsp-start :enable (not (eglot-current-server))]
+      ["Stop LSP" slang-lsp-stop :enable (eglot-current-server)]
+      ["Restart LSP" slang-lsp-restart :enable (eglot-current-server)]
+      "---"
+      ["Find Definition" xref-find-definitions :enable (eglot-current-server)]
+      ;; Note: References, Implementation, Type Definition not supported by this slangd version
+      ["Rename Symbol" eglot-rename :enable (eglot-current-server)]
+      ["Format Buffer" eglot-format :enable (eglot-current-server)]
+      ["Code Actions" eglot-code-actions :enable (eglot-current-server)]
+      "---"
+      ["Update Configuration" slang-lsp-update-configuration :enable (eglot-current-server)]
+      ["Server Info" slang-lsp-show-server-info :enable (eglot-current-server)]
+      ["Debug Capabilities" slang-lsp-debug-capabilities :enable (eglot-current-server)]
+      ["Check Server Type" slang-lsp-check-server-type t]
+      ["Test Server Manual" slang-lsp-test-server-manual t]
+      ["Installation Guide" slang-lsp-install-guide t])))
+
+(provide 'slang-lsp)
+
+;;; slang-lsp.el ends here