Switch to /bin/sh for compat and add --versionHEADmain

2 files changed, 93 insertions, 110 deletions

diff --git a/cosu b/cosu
index 454481b..4adf443 100755
--- a/cosu
+++ b/cosu
@@ -1,8 +1,6 @@
-#!/bin/bash
+#!/bin/sh
 
-set -e
-
-VERSION="1.0.0"
+VERSION="1.1.0"
 
 usage() {
     cat <<EOF
@@ -12,6 +10,7 @@ Conditionally execute a command with sudo based on file permissions.
 
 OPTIONS:
     -h, --help              Show this help message
+    --version               Show version information
 
 FLAGS (before each path):
     -r, --read              Check read permission
@@ -34,122 +33,103 @@ EOF
 }
 
 needs_sudo=0
-declare -a checks
-
-parse_args() {
-    local current_flags=()
-
-    while [[ $# -gt 0 ]]; do
-        case "$1" in
-            --help)
-                usage
-                ;;
-            --)
-                shift
-                if [[ $# -eq 0 ]]; then
-                    echo "Error: No command specified after '--'" >&2
-                    exit 1
-                fi
-                command_args=("$@")
-                return
-                ;;
-            --read)
-                current_flags+=("r")
-                shift
-                ;;
-            --write)
-                current_flags+=("w")
-                shift
-                ;;
-            --execute)
-                current_flags+=("x")
-                shift
-                ;;
-            -*)
-                local flags="${1#-}"
-                if [[ ! "$flags" =~ ^[rwxh]+$ ]]; then
-                    echo "Error: Unknown flag '$1'" >&2
-                    echo "Use -h or --help for usage information" >&2
-                    exit 1
-                fi
-
-                if [[ "$flags" == *h* ]]; then
-                    usage
-                fi
-
-                local i
-                for (( i=0; i<${#flags}; i++ )); do
-                    local flag="${flags:$i:1}"
-                    case "$flag" in
-                        r|w|x)
-                            current_flags+=("$flag")
-                            ;;
-                    esac
-                done
-                shift
-                ;;
-            *)
-                if [[ ${#current_flags[@]} -eq 0 ]]; then
-                    echo "Error: Path '$1' specified without permission flags" >&2
-                    echo "Use -h or --help for usage information" >&2
-                    exit 1
-                fi
-
-                local path="$1"
-                for flag in "${current_flags[@]}"; do
-                    checks+=("$flag:$path")
-                done
-                current_flags=()
-                shift
-                ;;
+current_flags=""
+found_sep=0
+
+expand_short_flags() {
+    f="$1"
+    while [ -n "$f" ]; do
+        c="${f%"${f#?}"}"
+        f="${f#?}"
+        case "$c" in
+            h) usage ;;
+            r|w|x) current_flags="${current_flags}${c}" ;;
         esac
     done
-
-    echo "Error: No '--' separator found" >&2
-    echo "Use -h or --help for usage information" >&2
-    exit 1
 }
 
-check_permissions() {
-    for check in "${checks[@]}"; do
-        local perm="${check%%:*}"
-        local path="${check#*:}"
-
-        case "$perm" in
-            r)
-                if [[ ! -r "$path" ]]; then
-                    needs_sudo=1
-                    return
-                fi
-                ;;
-            w)
-                if [[ ! -w "$path" ]]; then
-                    needs_sudo=1
-                    return
-                fi
-                ;;
-            x)
-                if [[ ! -x "$path" ]]; then
-                    needs_sudo=1
-                    return
-                fi
-                ;;
+check_flags_on_path() {
+    f="$1"
+    path="$2"
+    while [ -n "$f" ]; do
+        c="${f%"${f#?}"}"
+        f="${f#?}"
+        case "$c" in
+            r) if [ ! -r "$path" ]; then needs_sudo=1; fi ;;
+            w) if [ ! -w "$path" ]; then needs_sudo=1; fi ;;
+            x) if [ ! -x "$path" ]; then needs_sudo=1; fi ;;
         esac
     done
 }
 
-declare -a command_args
-
-if [[ $# -eq 0 ]]; then
+if [ $# -eq 0 ]; then
     usage
 fi
 
-parse_args "$@"
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --help)
+            usage
+            ;;
+        --version)
+            echo "cosu $VERSION"
+            exit 0
+            ;;
+        --read)
+            current_flags="${current_flags}r"
+            shift
+            ;;
+        --write)
+            current_flags="${current_flags}w"
+            shift
+            ;;
+        --execute)
+            current_flags="${current_flags}x"
+            shift
+            ;;
+        --)
+            shift
+            found_sep=1
+            break
+            ;;
+        -*)
+            flags="${1#-}"
+            case "$flags" in
+                *[!rwxh]*)
+                    echo "Error: Unknown flag '$1'" >&2
+                    echo "Use -h or --help for usage information" >&2
+                    exit 1
+                    ;;
+            esac
+            expand_short_flags "$flags"
+            shift
+            ;;
+        *)
+            if [ -z "$current_flags" ]; then
+                echo "Error: Path '$1' specified without permission flags" >&2
+                echo "Use -h or --help for usage information" >&2
+                exit 1
+            fi
+            check_flags_on_path "$current_flags" "$1"
+            current_flags=""
+            shift
+            ;;
+    esac
+done
+
+if [ "$found_sep" -eq 0 ]; then
+    echo "Error: No '--' separator found" >&2
+    echo "Use -h or --help for usage information" >&2
+    exit 1
+fi
 
-check_permissions
+if [ $# -eq 0 ]; then
+    echo "Error: No command specified after '--'" >&2
+    exit 1
+fi
 
-if [[ $needs_sudo -eq 1 ]]; then
-    exec sudo "${command_args[@]}"
+if [ "$needs_sudo" -eq 1 ]; then
+    exec sudo "$@"
 else
-    exec "${command_args[@]}"
+    exec "$@"
 fi
diff --git a/cosu.1 b/cosu.1
index 5b9ee0b..adf240e 100644
--- a/cosu.1
+++ b/cosu.1
@@ -1,4 +1,4 @@
-.TH COSU 1 "February 2026" "cosu 1.0.0" "User Commands"
+.TH COSU 1 "February 2026" "cosu 1.1.0" "User Commands"
 .SH NAME
 cosu \- conditionally execute commands with sudo based on file permissions
 .SH SYNOPSIS
@@ -18,6 +18,9 @@ If all checks pass, the command runs normally without privilege escalation.
 .TP
 .BR \-h ", " \-\-help
 Display help message and exit.
+.TP
+.B \-\-version
+Print version information and exit.
 .SH FLAGS
 The following flags specify which permissions to check on the subsequent path.
 Multiple flags can be specified before a single path. Short flags can be
@@ -159,4 +162,4 @@ There is NO WARRANTY, to the extent permitted by law.
 .SH SEE ALSO
 .BR sudo (8),
 .BR test (1),
-.BR bash (1)
+.BR sh (1)