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" Vim plugin for converting a syntax highlighted file to HTML.
" Maintainer: Ben Fritz <fritzophrenic@gmail.com>
" Last Change: 2023 Sep 07
"
" The core of the code is in $VIMRUNTIME/autoload/tohtml.vim and
" $VIMRUNTIME/syntax/2html.vim
"
if exists('g:loaded_2html_plugin')
finish
endif
let g:loaded_2html_plugin = 'vim9.0_v2'
"
" Changelog: {{{
" 9.0_v2 (this version): - Warn if using deprecated g:use_xhtml option
" - Change default g:html_use_input_for_pc to "none"
" instead of "fallback". All modern browsers support
" the "user-select: none" and "content:" CSS
" properties so the older method relying on extra
" markup and unspecified browser/app clipboard
" handling is only needed in rare special cases.
" - Fix SourceForge issue #33: generate diff filler
" correctly when new lines have been added to or
" removed from end of buffer.
" - Fix SourceForge issue #32/Vim Github issue #8547:
" use translated highlight ID for styling the
" special-use group names (e.g. LineNr) used
" directly by name in the 2html processing.
" - Fix SourceForge issue #26, refactoring to use
" :let-heredoc style string assignment and
" additional fixes for ".." vs. "." style string
" concatenation. Requires Vim v8.1.1354 or higher.
" 9.0_v1 (Vim 9.0.1275): - Implement g:html_no_doc and g:html_no_modeline
" for diff mode. Add tests.
" (Vim 9.0.1122): NOTE: no version string update for this version!
" - Bugfix for variable name in g:html_no_doc
" (Vim 9.0.0819): NOTE: no version string update for this version!
" - Add options g:html_no_doc, g:html_no_lines,
" and g:html_no_modeline (partially included in Vim
" runtime prior to version string update).
" - Updates for new Vim9 string append style (i.e. use
" ".." instead of "."). Requires Vim version
" 8.1.1114 or higher.
"
" 8.1 updates: {{{
" 8.1_v2 (Vim 8.1.2312): - Fix SourceForge issue #19: fix calculation of tab
" stop position to use in expanding a tab, when that
" tab occurs after a syntax match which in turn
" comes after previously expanded tabs.
" - Set eventignore while splitting a window for the
" destination file to ignore FileType events;
" speeds up processing when the destination file
" already exists and HTML highlight takes too long.
" - Fix SourceForge issue #20: progress bar could not be
" seen when DiffDelete background color matched
" StatusLine background color. Added TOhtmlProgress
" highlight group for manual user override, but
" calculate it to be visible compared to StatusLine
" by default.
" - Fix SourceForge issue #1: Remove workaround for old
" browsers which don't support 'ch' CSS unit, since
" all modern browsers, including IE>=9, support it.
" - Fix SourceForge issue #10: support termguicolors
" - Fix SourceForge issue #21: default to using
" generated content instead of <input> tags for
" uncopyable text, so that text is correctly
" prevented from being copied in chrome. Use
" g:html_use_input_for_pc option to control the
" method used.
" - Switch to HTML5 to allow using vnu as a validator
" in unit test.
" - Fix fallback sizing of <input> tags for browsers
" without "ch" support.
" - Fix cursor on unselectable diff filler text.
" 8.1_v1 (Vim 8.1.0528): - Fix SourceForge issue #6: Don't generate empty
" script tag.
" - Fix SourceForge issue #5: javascript should
" declare variables with "var".
" - Fix SourceForge issue #13: errors thrown sourcing
" 2html.vim directly when plugins not loaded.
" - Fix SourceForge issue #16: support 'vartabstop'.
"}}}
"
" 7.4 updates: {{{
" 7.4_v2 (Vim 7.4.0899): Fix error raised when converting a diff containing
" an empty buffer. Jan Stocker: allow g:html_font to
" take a list so it is easier to specfiy fallback
" fonts in the generated CSS.
" 7.4_v1 (Vim 7.4.0000): Fix modeline mangling for new "Vim:" format, and
" also for version-specific modelines like "vim>703:".
"}}}
"
" 7.3 updates: {{{
" 7.3_v14 (Vim 7.3.1246): Allow suppressing line number anchors using
" g:html_line_ids=0. Allow customizing
" important IDs (like line IDs and fold IDs) using
" g:html_id_expr evaluated when the buffer conversion
" is started.
" 7.3_v13 (Vim 7.3.1088): Keep foldmethod at manual in the generated file and
" insert modeline to set it to manual.
" Fix bug: diff mode with 2 unsaved buffers creates a
" duplicate of one buffer instead of including both.
" Add anchors to each line so you can put '#L123'
" or '#123' at the end of the URL to jump to line 123
" (idea by Andy Spencer). Add javascript to open folds
" to show the anchor being jumped to if it is hidden.
" Fix XML validation error: &nsbp; not part of XML.
" Allow TOhtml to chain together with other commands
" using |.
" 7.3_v12 (Vim 7.3.0616): Fix modeline mangling to also work for when multiple
" highlight groups make up the start-of-modeline text.
" Improve render time of page with uncopyable regions
" by not using one-input-per-char. Change name of
" uncopyable option from html_unselectable to
" html_prevent_copy. Added html_no_invalid option and
" default to inserting invalid markup for uncopyable
" regions to prevent MS Word from pasting undeletable
" <input> elements. Fix 'cpo' handling (Thilo Six).
" 7.3_v12b1: Add html_unselectable option. Rework logic to
" eliminate post-processing substitute commands in
" favor of doing the work up front. Remove unnecessary
" special treatment of 'LineNr' highlight group. Minor
" speed improvements. Fix modeline mangling in
" generated output so it works for text in the first
" column. Fix missing line number and fold column in
" diff filler lines. Fix that some fonts have a 1px
" gap (using a dirty hack, improvements welcome). Add
" "colorscheme" meta tag. Does NOT include support for
" the new default foldtext added in v11, as the patch
" adding it has not yet been included in Vim.
" 7.3_v11 ( unreleased ): Support new default foldtext from patch by Christian
" Brabandt in
" http://groups.google.com/d/topic/vim_dev/B6FSGfq9VoI/discussion.
" This patch has not yet been included in Vim, thus
" these changes are removed in the next version.
" 7.3_v10 (Vim 7.3.0227): Fix error E684 when converting a range wholly inside
" multiple nested folds with dynamic folding on.
" Also fix problem with foldtext in this situation.
" 7.3_v9 (Vim 7.3.0170): Add html_pre_wrap option active with html_use_css
" and without html_no_pre, default value same as
" 'wrap' option, (Andy Spencer). Don't use
" 'fileencoding' for converted document encoding if
" 'buftype' indicates a special buffer which isn't
" written.
" 7.3_v8 (Vim 7.3.0100): Add html_expand_tabs option to allow leaving tab
" characters in generated output (Andy Spencer).
" Escape text that looks like a modeline so Vim
" doesn't use anything in the converted HTML as a
" modeline. Bugfixes: Fix folding when a fold starts
" before the conversion range. Remove fold column when
" there are no folds.
" 7.3_v7 (Vim 7-3-0063): see betas released on vim_dev below:
" 7.3_v7b3: Fixed bug, convert Unicode to UTF-8 all the way.
" 7.3_v7b2: Remove automatic detection of encodings that are not
" supported by all major browsers according to
" http://wiki.whatwg.org/wiki/Web_Encodings and
" convert to UTF-8 for all Unicode encodings. Make
" HTML encoding to Vim encoding detection be
" case-insensitive for built-in pairs.
" 7.3_v7b1: Remove use of setwinvar() function which cannot be
" called in restricted mode (Andy Spencer). Use
" 'fencoding' instead of 'encoding' to determine by
" charset, and make sure the 'fenc' of the generated
" file matches its indicated charset. Add charsets for
" all of Vim's natively supported encodings.
" 7.3_v6 (Vim 7.3.0000): Really fix bug with 'nowrapscan', 'magic' and other
" user settings interfering with diff mode generation,
" trailing whitespace (e.g. line number column) when
" using html_no_pre, and bugs when using
" html_hover_unfold.
" 7.3_v5 ( unreleased ): Fix bug with 'nowrapscan' and also with out-of-sync
" folds in diff mode when first line was folded.
" 7.3_v4 (Vim 7.3.0000): Bugfixes, especially for xhtml markup, and diff mode
" 7.3_v3 (Vim 7.3.0000): Refactor option handling and make html_use_css
" default to true when not set to anything. Use strict
" doctypes where possible. Rename use_xhtml option to
" html_use_xhtml for consistency. Use .xhtml extension
" when using this option. Add meta tag for settings.
" 7.3_v2 (Vim 7.3.0000): Fix syntax highlighting in diff mode to use both the
" diff colors and the normal syntax colors
" 7.3_v1 (Vim 7.3.0000): Add conceal support and meta tags in output
"}}}
"}}}
" TODO: {{{
" * Check the issue tracker:
" https://sourceforge.net/p/vim-tohtml/issues/search/?q=%21status%3Aclosed
" * Options for generating the CSS in external style sheets. New :TOcss
" command to convert the current color scheme into a (mostly) generic CSS
" stylesheet which can be re-used. Alternate stylesheet support? Good start
" by Erik Falor
" ( https://groups.google.com/d/topic/vim_use/7XTmC4D22dU/discussion ).
" * Add optional argument to :TOhtml command to specify mode (gui, cterm,
" term) to use for the styling. Suggestion by "nacitar".
" * Add way to override or specify which RGB colors map to the color numbers
" in cterm. Get better defaults than just guessing? Suggestion by "nacitar".
" * Disable filetype detection until after all processing is done.
" * Add option for not generating the hyperlink on stuff that looks like a
" URL? Or just color the link to fit with the colorscheme (and only special
" when hovering)?
" * Bug: Opera does not allow printing more than one page if uncopyable
" regions is turned on. Possible solution: Add normal text line numbers with
" display:none, set to display:inline for print style sheets, and hide
" <input> elements for print, to allow Opera printing multiple pages (and
" other uncopyable areas?). May need to make the new text invisible to IE
" with conditional comments to prevent copying it, IE for some reason likes
" to copy hidden text. Other browsers too?
" * Bug: still a 1px gap throughout the fold column when html_prevent_copy is
" "fn" in some browsers. Specifically, in Chromium on Ubuntu (but not Chrome
" on Windows). Perhaps it is font related?
" * Bug: still some gaps in the fold column when html_prevent_copy contains
" 'd' and showing the whole diff (observed in multiple browsers). Only gaps
" on diff lines though.
" * Undercurl support via CSS3, with fallback to dotted or something:
" https://groups.google.com/d/topic/vim_use/BzXA6He1pHg/discussion
" * Redo updates for modified default foldtext (v11) when/if the patch is
" accepted to modify it.
" * Test case +diff_one_file-dynamic_folds+expand_tabs-hover_unfold
" +ignore_conceal-ignore_folding+no_foldcolumn+no_pre+no_progress
" +number_lines-pre_wrap-use_css+use_xhtml+whole_filler.xhtml
" does not show the whole diff filler as it is supposed to?
" * Bug: when 'isprint' is wrong for the current encoding, will generate
" invalid content. Can/should anything be done about this? Maybe a separate
" plugin to correct 'isprint' based on encoding?
" * Check to see if the windows-125\d encodings actually work in Unix without
" the 8bit- prefix. Add prefix to autoload dictionaries for Unix if not.
" * Font auto-detection similar to
" http://www.vim.org/scripts/script.php?script_id=2384 but for a variety of
" platforms.
" * Pull in code from http://www.vim.org/scripts/script.php?script_id=3113 :
" - listchars support
" - full-line background highlight
" - other?
" * Make it so deleted lines in a diff don't create side-scrolling (get it
" free with full-line background highlight above).
" * Restore open/closed folds and cursor position after processing each file
" with option not to restore for speed increase.
" * Add extra meta info (generation time, etc.)?
" * Tidy up so we can use strict doctype in even more situations
" * Implementation detail: add threshold for writing the lines to the html
" buffer before we're done (5000 or so lines should do it)
" * TODO comments for code cleanup scattered throughout
"}}}
" Define the :TOhtml command when:
" - 'compatible' is not set
" - this plugin or user override was not already loaded
" - user commands are available. {{{
if !&cp && !exists(":TOhtml") && has("user_commands")
command -range=% -bar TOhtml :call tohtml#Convert2HTML(<line1>, <line2>)
endif "}}}
" Make sure any patches will probably use consistent indent
" vim: ts=8 sw=2 sts=2 noet fdm=marker