From 880c4a5c00feb536c491b64c0882326869bd1838 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?= <nicolas@ortegas.org>
Date: Fri, 10 Jul 2026 16:01:29 +0200
Subject: [PATCH] Add plugin code.

---
 plugin/licenser.vim | 132 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 plugin/licenser.vim

diff --git a/plugin/licenser.vim b/plugin/licenser.vim
new file mode 100644
index 0000000..4d64cec
--- /dev/null
+++ b/plugin/licenser.vim
@@ -0,0 +1,132 @@
+" Zlib License
+"
+" Copyright (c) 2026 Nicolás A. Ortega <nicolas@ortegas.org>
+"
+" This software is provided 'as-is', without any express or implied warranty. In
+" no event will the authors be held liable for any damages arising from the use
+" of this software.
+"
+" Permission is granted to anyone to use this software for any purpose, including
+" commercial applications, and to alter it and redistribute it freely, subject
+" to the following restrictions:
+"
+" 1. The origin of this software must not be misrepresented; you must not claim
+"    that you wrote the original software. If you use this software in a product,
+"    an acknowledgment in the product documentation would be appreciated but is
+"    not required.
+"
+" 2. Altered source versions must be plainly marked as such, and must not be
+"    misrepresented as being the original software.
+"
+" 3. This notice may not be removed or altered from any source distribution.
+" vim-licenser: A plugin for adding license headers to source code files
+
+" Usage:
+"   :Licenser <license>
+"
+" Available licenses can be found in the licenses/ directory
+
+if exists('g:loaded_licenser')
+	finish
+endif
+let g:loaded_licenser = 1
+
+function! s:GetCommentStyle(filetype) abort
+	let ft = a:filetype
+
+	" Define comment styles for different filetypes
+	"  - margin: if prefix and suffix should be used
+	"  - hashbang: if the file has a hashbang line, we should skip it when
+	"  adding the license header
+	"  - prefix: the string to use at the beginning of the comment block
+	"  - middle: the string to use at the beginning of each line in the comment
+	"  - suffix: the string to use at the end of the comment block
+	let comment_styles = {
+		\ 'bash': {'margin': 0, 'hashbang': 1, 'prefix': '', 'middle': '#', 'suffix': ''},
+		\ 'c': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'cpp': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'go': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'html': {'margin': 1, 'hashbang': 0, 'prefix': '<!--', 'middle': ' *', 'suffix': '-->'},
+		\ 'java': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'javascript': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'lua': {'margin': 0, 'hashbang': 1, 'prefix': '', 'middle': '--', 'suffix': ''},
+		\ 'python': {'margin': 0, 'hashbang': 1, 'prefix': '', 'middle': '#', 'suffix': ''},
+		\ 'ruby': {'margin': 0, 'hashbang': 1, 'prefix': '', 'middle': '#', 'suffix': ''},
+		\ 'rust': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'shell': {'margin': 0, 'hashbang': 1, 'prefix': '', 'middle': '#', 'suffix': ''},
+		\ 'typescript': {'margin': 1, 'hashbang': 0, 'prefix': '/*', 'middle': ' *', 'suffix': ' */'},
+		\ 'vim': {'margin': 0, 'hashbang': 0, 'prefix': '', 'middle': '"', 'suffix': ''},
+		\ 'xml': {'margin': 1, 'hashbang': 0, 'prefix': '<!--', 'middle': '  ', 'suffix': '-->'},
+	\ }
+	if has_key(comment_styles, ft)
+		return comment_styles[ft]
+	else
+		" Error message for unsupported filetypes
+		echohl ErrorMsg
+		echo 'Unsupported filetype: ' . ft
+		echohl None
+		return {'margin': 0, 'prefix': '', 'middle': '', 'suffix': ''}
+	endif
+endfunction
+
+function! s:AddLicenseHeader(license) abort
+	let plugin_dir = fnamemodify(expand('<sfile>'), ':h:h')
+	let license_file = plugin_dir . '/licenses/' . a:license . '.txt'
+
+	if !filereadable(license_file)
+		echohl ErrorMsg
+		echo 'License file not found: ' . license_file
+		echohl None
+		return
+	endif
+
+	let license_lines = readfile(license_file)
+	let author = get(g:, 'licenser_author', 'Author Name')
+	let year = strftime('%Y')
+
+	let comment_style = s:GetCommentStyle(&filetype)
+
+	let processed_lines = []
+
+	if comment_style.margin
+		call add(processed_lines, comment_style.prefix)
+	endif
+
+	for line in license_lines
+		let line = substitute(line, 'YEAR', year, 'g')
+		let line = substitute(line, 'AUTHOR', author, 'g')
+
+		if line ==# ''
+			call add(processed_lines, comment_style.middle)
+		else
+			call add(processed_lines, comment_style.middle . ' ' . line)
+		endif
+	endfor
+
+	if comment_style.margin
+		call add(processed_lines, comment_style.suffix)
+	endif
+
+	call append(comment_style.hashbang, processed_lines)
+endfunction
+
+function! s:CompleteFiletype(A, L, P) abort
+	let plugin_dir = fnamemodify(expand('<sfile>'), ':h:h')
+	let licenses_dir = plugin_dir . '/licenses/'
+
+	if !isdirectory(licenses_dir)
+		return []
+	endif
+
+	let licenses = []
+	for file in glob(licenses_dir . '*.txt', 0, 1)
+		let name = fnamemodify(file, ':t:r')
+		if name =~ '^' . a:A
+			call add(licenses, name)
+		endif
+	endfor
+
+	return sort(licenses)
+endfunction
+
+command! -nargs=1 -complete=customlist,s:CompleteFiletype Licenser call s:AddLicenseHeader(<q-args>)