From 58fa539d35079ad9bc3c59704b9dcf8a30ff7807 Mon Sep 17 00:00:00 2001
From: CyberLeo <cyberleo@cyberleo.net>
Date: Mon, 9 Jul 2012 06:26:20 -0500
Subject: [PATCH] sh/kvs: simple key-value store for shellscripts

---
 lib/sh/kvs.sh | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 lib/sh/kvs.sh

diff --git a/lib/sh/kvs.sh b/lib/sh/kvs.sh
new file mode 100644
index 0000000..23cf6d8
--- /dev/null
+++ b/lib/sh/kvs.sh
@@ -0,0 +1,70 @@
+# Simple bourne shell based key-value store
+
+if [ -z "${__kvs_sh_loaded}" ]
+then
+  __kvs_sh_loaded=yes
+
+  t="$(printf '\t')"
+
+  [ "${kvs}" ] || {
+    cat <<EOF
+KVS v0.1
+Copyright - http://wiki.cyberleo.net/wiki/CyberLeo/COPYRIGHT?version=4
+
+Set the following variables before sourcing this library:
+
+ kvs  - Path and filename of the kvdb database file
+EOF
+    kill -ABRT $$
+    exit 1
+  }
+
+  [ -s "${kvs}" ] || echo "${t}${t}# KVSv0 id-key-value database" > "${kvs}"
+
+  # Add or replace a value stored for a given key and id in the kvs
+  kvs_set() {
+    [ "${1}" -a "${2}" ] || return 255
+    local id="${1}"
+    local var="${2}"
+    local val="${3}"
+    printf "%s\t%s\t%s\n" "${id}" "${var}" "${val}" >> "${kvs}"
+  }
+
+  # Fetch the most recent value stored for a given key and id from the kvs
+  kvs_get() {
+    [ "${1}" -a "${2}" ] || return 255
+    local id="${1}"
+    local var="${2}"
+    grep "^${id}${t}${var}${t}" "${kvs}" | tail -n 1 | cut -d"${t}" -f3-
+  }
+
+  # Does the kvs have any entries for a given ID?
+  kvs_has_id() {
+    [ "${1}" ] || return 255
+    local id="${1}"
+    grep -q "^${id}${t}" "${kvs}"
+  }
+
+  # Does the kvs have a given key for a given ID?
+  kvs_has_key() {
+    [ "${1}" -a "${2}" ] || return 255
+    local id="${1}"
+    local var="${2}"
+    grep -q "^${id}${t}${var}${t}" "${kvs}"
+  }
+
+  # Remove a given key with a given ID from the kvs
+  kvs_unset() {
+    [ "${1}" -a "${2}" ] || return 255
+    local id="${1}"
+    local var="${2}"
+    grep -v "^${id}${t}${var}${t}" "${kvs}" > "${kvs}.tmp" && mv -f "${kvs}.tmp" "${kvs}" || rm -f "${kvs}.tmp"
+  }
+
+  # Remove all keys with a given ID from the kvs
+  kvs_unset_all() {
+    [ "${1}" ] || return 255
+    local id="${1}"
+    grep -v "^${id}${t}" "${kvs}" > "${kvs}.tmp" && mv -f "${kvs}.tmp" "${kvs}" || rm -f "${kvs}.tmp"
+  }
+fi
-- 
2.45.0