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diff --git a/.local/bin/getcomproot b/.local/bin/getcomproot
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+#!/bin/sh
+
+# A helper script for LaTeX/groff files used by `compiler` and `opout`.
+# The user can add the root file of a larger project as a comment as below:
+# % root = mainfile.tex
+# And the compiler script will run on that instead of the opened file.
+
+texroot="$(sed -n 's/^\s*%.*root\s*=\s*\(\S\+\).*/\1/p' "${1}")"
+[ -f "${texroot}" ] && readlink -f "${texroot}" || exit "1"