feat(package): hemar: continios work

package/hemar/plex/backend/file.sh

@@ -0,0 +1,67 @@
+#!/bin/dash
+
+PLEX_TEMP="$(mktemp -d)"
+
+plex_set() {
+    local plexfile key val regex base esc_key esc
+    plexfile="${PLEX_TEMP:?}${1:?}" key="${2:?}" val="${3:?}"
+
+    # construct regex for ancestors
+    regex="^$key="
+
+    base=$key
+    while expr "$base" : '.*\.' >/dev/null; do
+        base=$(printf '%s\n' "$base" | sed 's/\.[^.]*$//')
+        esc=$(printf '%s\n' "$base" | sed 's/\./\\./g')
+        regex="$regex|^$esc="
+    done
+
+    # add descendants
+    esc_key="$(printf '%s\n' "$key" | sed 's/\./\\./g')"
+    regex="$regex|^${esc_key}\."
+
+    # remove old
+    grep -v -E "$regex" "$plexfile" > "$plexfile.tmp" && mv "$plexfile.tmp" "$plexfile"
+
+    # add new
+    printf '%s=%s\n' "$key" "$val" >> "$plexfile"
+}
+
+plex_child() {
+    local plexfile key
+    plexfile="${PLEX_TEMP:?}${1:?}" key="${2:?}"
+
+    grep "^$key\." "" | sed "s|^$key\.||"
+}
+
+plex_val() {
+    local plexfile key
+    plexfile="${PLEX_TEMP:?}${1:?}" key="${2:?}"
+    grep "^$key=" | cut -d= -f2- "$plexfile"
+}
+
+plex_fetch() {
+    local plexfile key temp
+    plexfile="${PLEX_TEMP:?}${1:?}" key="${2:?}"
+
+    if temp="$(grep "^$key=" | cut -d= -f2- "$plexfile")"; then
+      printf '%s' "$temp"
+    else
+      grep "^$key\." "" | sed "s|^$key\.||"
+    fi
+}
+
+plex_push() {
+  local plex prefix val max idx newidx kv
+  plex="${1:?}" prefix="${2:?}" val="${3:?}"
+
+  # find max index
+  max=0
+  for kv in $(plex_fetch "$plex" "$prefix"); do
+      idx=${kv%%=*}
+      [ "$idx" -gt "$max" ] 2>/dev/null && max=$idx
+  done
+
+  newidx=$((max + 1))
+  plex_set "$plex" "$prefix.$newidx" "$val"
+}