How can I do document-wide title case capitalization in KOMA-script?

Question

I'd like to use title case in KOMA-script-typeset title page and section titles.
Of course, I can do
documentclass[version=last]{scrreprt} % it's 3.32
usepackage{titlecaps}

title{titlecap{The Beginning of the document}}

begin{document}
    maketitle
    tableofcontents
    section{titlecap{My title with caps}}
end{document}

However, I'd like to have something idiomatic, say,
setkomafont{disposition}{rmfamilyMakeTitleCase}

How can I automate title-casing?

esdd · Accepted Answer

You could patch chapterlinesformat, chapterlineswithprefixformat, sectionlinesformat, sectioncatchphraseformat and maybe minisec:
usepackage{titlecaps}
usepackage{xpatch}

newcommand*MakeTitleCase[1]{titlecap{#1}}

xpatchcmdchapterlinesformat{#3}{MakeTitleCase{#3}}{}{clfpatchfailed}
xpatchcmdchapterlineswithprefixformat{#3}{MakeTitleCase{#3}}{}{clwpfpatchfailed}
xpatchcmdsectionlinesformat{#4}{MakeTitleCase{#4}}{}{slfpatchfailed}
xpatchcmdsectioncatchphraseformat{#4}{MakeTitleCase{#4}}{}{scpfpatchfailed}
xpatchcmdminisec{#1}{MakeTitleCase{#1}}{}{mspatchfailed}

For the title you can use
newcommand*originaltitle{}
letoriginaltitletitle
renewcommandtitle[1]{originaltitle{MakeTitleCase{#1}}}

With
newcommand*originaladdchaptertocentry{}
letoriginaladdchaptertocentryaddchaptertocentry
renewcommand*addchaptertocentry[2]{originaladdchaptertocentry{#1}{MakeTitleCase{#2}}}

only chapter entries will use MakeTitleCase in TOC.
If all entries in TOC should use MakeTitleCase:
newcommand*originaladdtocentrydefault{}
letoriginaladdtocentrydefaultaddtocentrydefault
renewcommand*addtocentrydefault[3]{originaladdtocentrydefault{#1}{#2}{MakeTitleCase{#3}}}

Example:
documentclass[version=last]{scrreprt} % it's 3.32
usepackage{titlecaps}
usepackage{xpatch}

newcommand*MakeTitleCase[1]{titlecap{#1}}

xpatchcmdchapterlinesformat{#3}{MakeTitleCase{#3}}{}{clfpatchfailed}
xpatchcmdchapterlineswithprefixformat{#3}{MakeTitleCase{#3}}{}{clwpfpatchfailed}
xpatchcmdsectionlinesformat{#4}{MakeTitleCase{#4}}{}{slfpatchfailed}
xpatchcmdsectioncatchphraseformat{#4}{MakeTitleCase{#4}}{}{scpfpatchfailed}
xpatchcmdminisec{#1}{MakeTitleCase{#1}}{}{mspatchfailed}

newcommand*originaltitle{}
letoriginaltitletitle
renewcommandtitle[1]{originaltitle{MakeTitleCase{#1}}}

newcommand*originaladdtocentrydefault{}
letoriginaladdtocentrydefaultaddtocentrydefault
renewcommand*addtocentrydefault[3]{originaladdtocentrydefault{#1}{#2}{MakeTitleCase{#3}}}

title{The Beginning of the document}
author{Author}
begin{document}
maketitle
tableofcontents
chapter{A chapter with caps}
section{A section with caps}
minisec{A minisec with caps}
paragraph{A paragraph with caps}
Example text ...
end{document}

How can I do document-wide title case capitalization in KOMA-script?

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