Semi working myssh script.

script/myssh

@@ -1,5 +1,18 @@
 #!/usr/bin/env bash
+set -e
+SQL_PROXY_HOST="${SQL_PROXY_HOST:-localhost}"
+CONNECTION_CACHE="$HOME/.cache/sqlproxy_${SQL_PROXY_HOST}"
 
+HELP="Usage: myssh [ls|connect]\n
+SUBCOMMANDS:\n
+  ls: list available database hosts\n
+  connect: connect to a database host\n
+  disconnect: Quit existing ssh master session\n
+\n
+SYNTAX connect host [-u user] [-p password] [-c client]
+"
+
+get_template_string() {
     if [ -z "$SQL_CLI_TEMPLATE" ]
     then
         if [ $(uname -s) = "Linux" ]
@@ -16,18 +29,8 @@ else
             exit
         fi
     fi
-
+    printf '%s' "${SQL_CLI_TEMPLATE}"
-[ -z $SQL_PROXY_HOST ] && SQL_PROXY_HOST="localhost"
+}
-CONNECTION_CACHE="$HOME/.cache/sqlproxy_$SQL_PROXY_HOST"
-
-HELP="Usage: myssh [ls|connect]\n
-SUBCOMMANDS:\n
-  ls: list available database hosts\n
-  connect: connect to a database host\n
-  disconnect: Quit existing ssh master session\n
-\n
-SYNTAX connect host [-u user] [-p password] [-c client]
-"
 
 ssh_status() {
     ssh -O check -S $HOME/.ssh/controlmasters/%r@%h:%p $SQL_PROXY_HOST > /dev/null 2>&1
@@ -51,9 +54,13 @@ disconnect() {
     fi
 }
 
+# Establishes a port forward to the target host
+# args:
+# $1 - target ip
+# $2 - target port
 port_forward() {
     ACTIVE_HOST=$(cat $CONNECTION_CACHE)
-    if [ -z $ACTIVE_HOST ] || [ $ACTIVE_HOST != $1:$2 ]
+    if [ -z $ACTIVE_HOST ] || [ $ACTIVE_HOST != "$1:$2" ]
     then
         if [ ! -z $ACTIVE_HOST ]
         then
@@ -63,7 +70,7 @@ port_forward() {
         echo $1 $2
         ssh -O forward -L 6033:$1:$2 -S ${HOME}/.ssh/controlmasters/%r@%h:%p ${SQL_PROXY_HOST}
     fi
-    echo $2:$3 > "${CONNECTION_CACHE}"
+    echo "$1:$2" > "${CONNECTION_CACHE}"
 }
 
 ls_hosts() {
@@ -71,27 +78,87 @@ ls_hosts() {
 }
 
 get_host() {
-    if [ $1 == '' ]
+    if [ $1 = '' ]
     then
         printf 'Please specify the host to connect to.\nRun "myssh ls" to list all available hosts.\n'
+        exit 1
     else
-        ssh -S ${HOME}/.ssh/controlmasters/%r@%h:%p "${SQL_PROXY_HOST}" "get $1"
+        TARGET_HOST_DATA=$(ssh -S ${HOME}/.ssh/controlmasters/%r@%h:%p "${SQL_PROXY_HOST}" "get $1")
+        if [ "${TARGET_HOST_DATA}" = '' ]
+        then
+            printf 'No such host: "%s"\n' $1
+            exit 1
+        else
+            printf "%s" "${TARGET_HOST_DATA}"
+        fi
     fi
 }
 
+# Checks and sets sql login variables
+# args:
+# $1 - sql type (mysql or psql)
+# $2 - target ip
+# $3 - target port
+# $4 - username (optional)
+# $5 - password (optional)
 set_host_env() {
-    if [ $1 == 'mysql' | $1 == 'psql' ]
+    if [ $1 = 'mysql' ] || [ $1 = 'psql' ]
     then
         TARGET_HOST_TYPE=$1
+    else
+        printf 'Invalid Database type: "%s"\n' $1
+        exit 1
     fi
     if [ $2 != '' ]
     then
-
+        TARGET_HOST_IP=$2
+    else
+        printf 'No Host IP given.\n'
+        exit 1
     fi
+    if echo $3 | grep -q '[0-9]\+'
+    then
+       TARGET_HOST_PORT=$3
+    else
+        printf 'Invalid Host Port "%s" given.\n' "$3"
+    fi
+    if [ -z "${TARGET_HOST_USERNAME}" ] && [ -n $4 ]
+    then
+        TARGET_HOST_USERNAME=$4
+    fi
+    if [ -z "${TARGET_HOST_PASSWORD}" ] && [ -n $5 ]
+    then
+        TARGET_HOST_PASSWORD=$5
+    fi
+
 }
 
+# Runs the sql client for an active connection
+# args:
+# $1 - sql type (mysql or psql)
+# $2 - username
+# $3 - password
 run_client() {
-    $(eval echo $SQL_CLI_TEMPLATE)
+    if [ "$1" = 'mysql' ]
+    then
+        if which ace >/dev/null 2>&1
+        then
+            ace
+        elif which mysql >/dev/null 2>&1
+        then
+            mysql --protocol=TCP -u "$2" -p"$3" -h "${SQL_PROXY_HOST}" -P 6033
+        else
+            SHOW_CLI_HELP=true
+        fi
+    elif [ "${$1}" = 'psql' ]
+    then
+        SHOW_CLI_HELP=true
+    fi
+
+    if [ "${SHOW_CLI_HELP}" = true ]
+    then
+        printf 'No %s client binary found.\nYou can maually establish a connection using the following data.\nhost:\t%s\nport:\t6033\nuser:\t%s\npassword:\t%s\n' "$1" "${SQL_PROXY_HOST}" '3306' "$2" "$3"
+    fi
 }
 
 MAIN_OPTION=$1
@@ -110,17 +177,16 @@ case $MAIN_OPTION in
         while getopts "u:p:" o
         do
             case "$o" in
-                u) MYSQL_USERNAME="$OPTARG" ;;
+                u) TARGET_HOST_USERNAME="$OPTARG" ;;
-                p) MYSQL_PASSWORD="$OPTARG" ;;
+                p) TARGET_HOST_PASSWORD="$OPTARG" ;;
             esac
         done
-        TARGET_HOST_DATA="$(get_host "${TARGET_HOST}")"
+        set_host_env $(get_host "${TARGET_HOST}")
-        port_forward $TARGET_HOST_DATA
+        port_forward "${TARGET_HOST_IP}" "$TARGET_HOST_PORT"
-        # port_forward $TARGET_HOST
+        if [ -n "${TARGET_HOST_USERNAME}" ] && [ -n "${TARGET_HOST_PASSWORD}" ]
-        # if [ ! -z $MYSQL_USERNAME ] && [ ! -z $MYSQL_PASSWORD ]
+        then
-        # then
+            run_client "${TARGET_HOST_TYPE}" "${TARGET_HOST_USERNAME}" "${TARGET_HOST_PASSWORD}"
-        #     run_client
+        fi
-        # fi
         ;;
     disconnect)
         disconnect;;