* lisp/calc/calccomp.el (math-compose-integ): Use Unicode integral
signs when available instead of a crude ASCII approximation, with a
shorter stem to save space.
* lisp/calc/calccomp.el (math-compose-sqrt): Use a square root
character, if possible (bug#22919). Suggested by Zephyr Pellerin
<zephyr.pellerin@gmail.com>.
* lisp/calc/calc-ext.el: Use lexical-binding, silence warnings.
(calc-init-extensions): Remove a few functions which can't be called
directly since they depend on dynamically scoped vars.
(calc-embedded-quiet): Declare.
(math-defcache): Use 'declare'.
(math-normalize-a): Remove declaration.
(math-normalize-nonstandard): Receive 'a' as arg instead.
(math-defintegral): Use 'declare'.
(math-exp-pos, math-exp-old-pos, math-exp-keep-spaces, math-rb-h2)
(math-read-big-baseline, math-read-big-h2, math-read-big-err-msg)
(math-exp-token, math-expr-data, math-exp-str): Declare.
(math-map-tree, math-read-expr): Avoid dynvars as formal arguments.
* lisp/calc/calc-poly.el: Use lexical-binding, silence warnings.
Turn some comments into docstrings.
(math-poly-div): Avoid dynvars as formal arguments.
(math-poly-base-top-expr): Move declaration before first use.
(calcFunc-factors, math-factor-expr, math-factor-expr-try)
(calcFunc-factor): Avoid dynvars as formal arguments.
* lisp/calc/calc.el: Use lexical-binding, silence warnings.
(math-normalize-a): Remove.
(math-normalize): Use lexical var 'a' instead.
(math-svo-c): Remove.
(math-stack-value-offset): Pass 'c' explicitly as arg to
math-stack-value-offset-fancy instead.
* lisp/calc/calccomp.el: Use lexical-binding, silence warnings.
(math-svo-c): Remove.
(math-stack-value-offset-fancy): Use new arg 'c' instead.
(math-comp-to-string-flat): Avoid dynvars as formal arguments.
Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November. Change these FTP URLs to https://ftp.gnu.org
instead. Make similar changes for URLs to other organizations moving
away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.
(calc-highlight-selections-with-faces): New variable.
(calc-selected-face, calc-nonselected-face): New faces.
calccomp.el (math-comp-highlight-string): Use
`calc-highlight-selections-with-faces' to determine how to highlight
subformulas.
calc-sel.el (calc-show-selections): Change message to something
appropriate.
calc.texi (Making Selections, Selecting Subformulas)
(Customizing Calc): Mention how to use faces to emphasize selected
subformulas.
(math-compose-expr): Allow more special functions to be used.
Change test for formatting fractions. Use variables and property
names to help with language specific formatting.
(math-compose-tex-matrix, math-compose-eqn-matrix)
(math-eqn-special-functions): Move to calc-lang.el
(math-compose-rows): Use property names to help with language specific
formatting.
