[gentoo-dev] [PATCH 21/30] distutils-r1.eclass: Use heredoc instead of "python -c"

[Michał Górny]

Use heredocs instead of inlining longish scripts in "python -c",
for greater readability.  Thanks to arthurzam for the suggestion.

Signed-off-by: Michał Górny <mgo...@gentoo.org>
---
 eclass/distutils-r1.eclass | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 7f9cf242c421..ea8fc7e5d165 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -936,9 +936,13 @@ _distutils-r1_get_backend() {
        if [[ -f pyproject.toml ]]; then
                # if pyproject.toml exists, try getting the backend from it
                # NB: this could fail if pyproject.toml doesn't list one
-               build_backend=$("${EPYTHON}" -c 'import tomli; \
-                       print(tomli.load(open("pyproject.toml", "rb")) \
-                               ["build-system"]["build-backend"])' 2>/dev/null)
+               build_backend=$(
+                       "${EPYTHON}" - <<-EOF 2>/dev/null
+                               import tomli
+                               print(tomli.load(open("pyproject.toml", "rb"))
+                                       ["build-system"]["build-backend"])
+                       EOF
+               )
        fi
        if [[ -z ${build_backend} && ${DISTUTILS_USE_PEP517} == setuptools &&
                -f setup.py ]]
@@ -1004,10 +1008,13 @@ distutils_pep517_install() {
 
        local build_backend=$(_distutils-r1_get_backend)
        einfo "  Building the wheel for ${PWD#${WORKDIR}/} via ${build_backend}"
-       local wheel=$("${EPYTHON}" -c "import ${build_backend%:*}; \
-               import os; \
-               
print(${build_backend/:/.}.build_wheel(os.environ['WHEEL_BUILD_DIR']))" ||
-               die "Wheel build failed")
+       local wheel=$(
+               "${EPYTHON}" - <<-EOF || die "Wheel build failed"
+                       import ${build_backend%:*}
+                       import os
+                       
print(${build_backend/:/.}.build_wheel(os.environ['WHEEL_BUILD_DIR']))
+               EOF
+       )
        [[ -n ${wheel} ]] || die "No wheel name returned"
 
        einfo "  Installing the wheel to ${root}"
@@ -1017,9 +1024,13 @@ distutils_pep517_install() {
        # NB: we override sys.prefix & sys.exec_prefix because otherwise
        # installer would use virtualenv's prefix
        local -x PYTHON_PREFIX=${EPREFIX}/usr
-       "${EPYTHON}" -c 'import os, sys; sys.prefix = sys.exec_prefix = 
os.environ["PYTHON_PREFIX"]; from installer.__main__ import main; 
main(sys.argv[1:])' \
-               -d "${root}" "${WHEEL_BUILD_DIR}/${wheel}" 
--no-compile-bytecode ||
-               die "installer failed"
+       "${EPYTHON}" - -d "${root}" "${WHEEL_BUILD_DIR}/${wheel}" 
--no-compile-bytecode \
+                       <<-EOF || die "installer failed"
+               import os, sys
+               sys.prefix = sys.exec_prefix = os.environ["PYTHON_PREFIX"]
+               from installer.__main__ import main
+               main(sys.argv[1:])
+       EOF
 
        # remove installed licenses
        find "${root}$(python_get_sitedir)" \
-- 
2.35.1