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[203_27] Fix LaTeX export for partially colored formulas using \textcolor #3038

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[203_27] Fix LaTeX export for partially colored formulas using \textcolor #3038

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2 changes: 1 addition & 1 deletion TeXmacs/progs/convert/latex/latex-define.scm
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Original file line number Diff line number Diff line change
Expand Up @@ -429,7 +429,7 @@
(tmcodeinline ((!option "") (!group (ttfamily) (!group 2))))

;; Binary macros
(tmcolor (!group (color 1) (!group 2)))
(tmcolor (textcolor 1 2))
(tmsummarizeddocumentation
(trivlist (!append (item (!option "")) (mbox "") "\\large\\bf" 1)))
(tmsummarizedgrouped (trivlist (!append (item (!option "[")) (mbox "") 1)))
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6 changes: 3 additions & 3 deletions TeXmacs/progs/convert/latex/latex-drd.scm
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Expand Up @@ -116,9 +116,9 @@
(captionof "capt-of")
(widthof "calc")

(color "xcolor")
(fcolorbox "xcolor")
(textcolor "xcolor")
(color "xcolor")
(fcolorbox "xcolor")
(textcolor "xcolor")

(euro "eurosym")

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6 changes: 4 additions & 2 deletions TeXmacs/progs/convert/latex/tmtex.scm
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Expand Up @@ -1591,6 +1591,8 @@
(cond ((and (== cm "none") (nnull? force-html))
(tmtex-decode-color (get-hex-color s) force-html))
((and (== cm "HTML") (nnull? force-html))
(when (nin? cm tmtex-colormaps)
(set! tmtex-colormaps (append (list cm) tmtex-colormaps)))
`((!option "HTML") ,(html-color->latex-xcolor s)))
((== cm "texmacs")
(when (nin? s tmtex-colors)
Expand All @@ -1607,8 +1609,8 @@
(define (tmtex-make-color val arg)
(with ltxcolor (tmtex-decode-color val #t)
(if (list? ltxcolor)
`(!group (!append (color ,@ltxcolor) ,arg))
`(tmcolor ,ltxcolor ,arg))))
`(textcolor ,@ltxcolor ,arg)
`(textcolor ,ltxcolor ,arg))))

(define (post-process-math-text t)
(cond ((or (nlist? t) (!= (length t) 2)) t)
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16 changes: 16 additions & 0 deletions devel/203_27.md
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@@ -0,0 +1,16 @@
# #3035 Fix LaTeX color export for partially styled formulas

## 2026/03/25 Update LaTeX export for colored expressions

### What
Updated LaTeX export for colored expressions to use \textcolor and ensured proper xcolor package handling for HTML colors.

### Why
- Replaces fragile \color usage with scoped \textcolor, preventing color leakage
- Ensures correct behavior in both text and math mode
- Fixes missing xcolor inclusion for HTML (hex) colors

### How
- Updated tmtex-make-color in tmtex.scm to use \textcolor
- Fixed HTML color handling in tmtex-decode-color
- Aligned macro definitions in latex-define.scm with the new approach