Add support for shabang invocation

[ahmubashshir]

If the template starts with #!/usr/bin/esh or #!/usr/bin/env esh or some other variants, remove that line from output.

e.g.

template

#!/usr/bin/esh
UNAME: <% uname -a -%>
OS-RELEASE:<% while IFS='=' read -r var val; do %>
	<%= $var -%>: <%= $val -%>
<% done < /etc/os-release %>

expected

UNAME: Linux arch-baksho 6.11.7-1-ck-generic-v3 #1 SMP PREEMPT_DYNAMIC Sat Nov 9 12:02:35 EST 2024 x86_64 GNU/Linux OS-RELEASE: NAME: "Arch Linux" PRETTY_NAME: "Arch Linux" ID: arch BUILD_ID: rolling ANSI_COLOR: "38;2;23;147;209" HOME_URL: "https://archlinux.org/" DOCUMENTATION_URL: "https://wiki.archlinux.org/" SUPPORT_URL: "https://bbs.archlinux.org/" BUG_REPORT_URL: "https://gitlab.archlinux.org/groups/archlinux/-/issues" PRIVACY_POLICY_URL: "https://terms.archlinux.org/docs/privacy-policy/" LOGO: archlinux-logo

actual

#!/usr/bin/esh UNAME: Linux arch-baksho 6.11.7-1-ck-generic-v3 #1 SMP PREEMPT_DYNAMIC Sat Nov 9 12:02:35 EST 2024 x86_64 GNU/Linux OS-RELEASE: NAME: "Arch Linux" PRETTY_NAME: "Arch Linux" ID: arch BUILD_ID: rolling ANSI_COLOR: "38;2;23;147;209" HOME_URL: "https://archlinux.org/" DOCUMENTATION_URL: "https://wiki.archlinux.org/" SUPPORT_URL: "https://bbs.archlinux.org/" BUG_REPORT_URL: "https://gitlab.archlinux.org/groups/archlinux/-/issues" PRIVACY_POLICY_URL: "https://terms.archlinux.org/docs/privacy-policy/" LOGO: archlinux-logo

[jirutka]

I implemented it in #18, please try it out.

[ahmubashshir]

I implemented it in #18, please try it out.

It's working great... if possible I'd like to have #!/bin/esh or #!/usr/bin/esh too.

[jirutka]

if possible I'd like to have #!/bin/esh or #!/usr/bin/esh too.

You cannot expect that esh is installed in particular directory on every system – it’s not portable and not a good practice. That’s why I added the special case only for #!/usr/bin/env esh. Do you have any particular reason for not using /usr/bin/env?

[ahmubashshir]

if possible I'd like to have #!/bin/esh or #!/usr/bin/esh too.

You cannot expect that esh is installed in particular directory on every system – it’s not portable and not a good practice. That’s why I added the special case only for #!/usr/bin/env esh. Do you have any particular reason for not using /usr/bin/env?

It's a bit long 🙃, nvm then...