Zsh: Make functions also usable as shell scripts

.config/zsh/functions/cat-highlight

@@ -1,25 +1,22 @@
-# -*- mode: shell-script; -*-
-
+#!/usr/bin/env zsh
 # Highlight cat output with whatever less is using for highlighting. The command
 # in $LESSOPEN needs to be able to work with multiple files.
-function cat-highlight()
-{
-    # Check if we are in a terminal and $LESSOPEN is not empty
-    if [[ -t 1 && -n "${LESSOPEN}" ]]; then
-        local -a args
-        local -a files
-        for arg in "${@}"; do
-            # Filter out file names
-            if [[ "${arg[1]}" != "-" ]]; then
-                files+="${arg}"
-            else
-                args+="${arg}"
-            fi
-        done
 
-        local catopen="${LESSOPEN/|/}"
-        eval "${catopen/\%s/${files}} | \cat ${args}"
-    else
-        \cat "${@}"
-    fi
-}
+# Check if we are in a terminal and $LESSOPEN is not empty
+if [[ -t 1 && -n "${LESSOPEN}" ]]; then
+    local -a args
+    local -a files
+    for arg in "${@}"; do
+        # Filter out file names
+        if [[ "${arg[1]}" != "-" ]]; then
+            files+="${arg}"
+        else
+            args+="${arg}"
+        fi
+    done
+
+    local catopen="${LESSOPEN/|/}"
+    eval "${catopen/\%s/${files}} | \cat ${args}"
+else
+    \cat "${@}"
+fi

.config/zsh/functions/export-emacs

@@ -1,18 +1,15 @@
-# -*- mode: shell-script; -*-
-
+#!/usr/bin/env zsh
 # Export variable to Emacs.
-function export-emacs
-{
-    if [[ ARGC -eq 0 ]]; then
-        print -u 2 "Usage: ${0} <variable> …"
-        return 1
-    fi
 
-    # Fail if we can't communicate with the daemon
-    [[ "$(emacsclient -e t)" == 't' ]] || return 1
+if [[ ARGC -eq 0 ]]; then
+    print -u 2 "Usage: ${0} <variable> …"
+    return 1
+fi
 
-    for name in "${@}"; do
-        value=$(eval print \"\$${name}\")
-        emacsclient -e "(setenv \"${name}\" \"${value}\")" >/dev/null
-    done
-}
+# Fail if we can't communicate with the daemon
+[[ "$(emacsclient -e t)" == 't' ]] || return 1
+
+for name in "${@}"; do
+    value=$(eval print \"\$${name}\")
+    emacsclient -e "(setenv \"${name}\" \"${value}\")" >/dev/null
+done

.config/zsh/functions/gdb_get_backtrace

@@ -1,19 +1,16 @@
-# -*- mode: shell-script; -*-
-
+#!/usr/bin/env zsh
 # Get backtrace from gdb
-function gdb_get_backtrace()
-{
-    if [[ ${ARGC} -ne 2 ]]; then
-        print -u 2 "Usage: ${0} <executable> <core dump>"
-        return 1
-    fi
-    local exe="${1}"
-    local core="${2}"
 
-    gdb "${exe}" \
-        --core "${core}" \
-        --batch \
-        --quiet \
-        -ex "thread apply all bt full" \
-        -ex "quit"
-}
+if [[ ${ARGC} -ne 2 ]]; then
+    print -u 2 "Usage: ${0} <executable> <core dump>"
+    return 1
+fi
+local exe="${1}"
+local core="${2}"
+
+gdb "${exe}" \
+    --core "${core}" \
+    --batch \
+    --quiet \
+    -ex "thread apply all bt full" \
+    -ex "quit"

.config/zsh/functions/mksmol

@@ -1,18 +1,15 @@
-# -*- mode: shell-script; -*-
-
+#!/usr/bin/env zsh
 # Makes all files in <directory> lower case. Works with Non-ASCII characters.
 # Equivalent to `zmv "${dir}/(*)" '${dir}/${1:l}'`
-function mksmol()
-{
-    if [[ ${ARGC} -ne 1 ]]; then
-        print -u 2 "Usage: ${0} <directory>" >&2
-        return 1
-    fi
-    local dir="${1}"
 
-    for file in "${dir}"/*; do
-        basename="${file##*/}"
-        newfile="${dir}/${basename:l}"
-        [[ "${file}" != "${newfile}" ]] && mv "${file}" "${newfile}" || :
-    done
-}
+if [[ ${ARGC} -ne 1 ]]; then
+    print -u 2 "Usage: ${0} <directory>" >&2
+    return 1
+fi
+local dir="${1}"
+
+for file in "${dir}"/*; do
+    basename="${file##*/}"
+    newfile="${dir}/${basename:l}"
+    [[ "${file}" != "${newfile}" ]] && mv "${file}" "${newfile}" || :
+done