diff --git a/.gitignore b/.gitignore
index 3a41b85..12bc14f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -163,3 +163,4 @@ cython_debug/
 fp-lib-table
 sym-lib-table
 symbols.txt
+envs.toml
diff --git a/.vscode/launch.json b/.vscode/launch.json
index edb3f0e..a977844 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -9,7 +9,7 @@
             "type": "debugpy",
             "request": "launch",
             "program": "exporter.py",
-            "args": [".\\sym-lib-table", ".\\symbols.txt"],
+            "args": [".\\sym-lib-table", ".\\symbols.txt", "-e", ".\\envs.toml"],
             "console": "integratedTerminal",
             "justMyCode": false
         }
diff --git a/envs.toml.template b/envs.toml.template
new file mode 100644
index 0000000..d6b4ba1
--- /dev/null
+++ b/envs.toml.template
@@ -0,0 +1,2 @@
+KICAD8_3RD_PARTY = '...\KiCad\8.0\3rdparty'
+KICAD8_SYMBOL_DIR = '...\KiCad\8.0\share\kicad\symbols\'
\ No newline at end of file
diff --git a/exporter.py b/exporter.py
index b802dda..2e45337 100644
--- a/exporter.py
+++ b/exporter.py
@@ -1,8 +1,11 @@
 import argparse
 import re
 import pprint as ppr
-from kiutils.libraries import LibTable    # using own parser for easier env var substitution
+from kiutils.libraries import LibTable
 from kiutils.symbol import SymbolLib
+import tomli
+import tomli_w
+import pathlib
 
 
 printer = ppr.PrettyPrinter(width=900)
@@ -15,6 +18,8 @@ def parse_inputs():
     parser = argparse.ArgumentParser()
     parser.add_argument('input', type=str, help='input file')
     parser.add_argument('output', type=str, help='output file')
+    parser.add_argument('-e', type=str, help='file containing replacements for the env vars (format: ENV = path)')
+    parser.add_argument('-s', action='store_true', default=False, help='save env vars to env.toml')
 
     args = parser.parse_args()
     return args
@@ -25,41 +30,54 @@ def main():
     
     filename = args.input
 
-    libs = table_to_dict(filename)
+    envs = load_envs(args)
+
+    libs = table_to_dict(filename, envs)
+
+    if args.s:
+        with open('envs.toml', "wb") as f:
+            tomli_w.dump(envs, f)
 
     with open(args.output, 'w+') as f:
-        for name, path in libs['libs'].items():
-            if libs['type'] == 'sym_lib_table':
-                ent = symbols_to_list(path)
-            pass
-
+        for lib in libs.libs:
+            if libs.type == 'sym_lib_table':
+                write_syms_to_file(f, lib)
+            if libs.type == 'fp_lib_table':
+                pass
+                # TODO
     pass
 
-def table_to_dict(filename):
+def write_syms_to_file(f, lib):
+    if lib.type == 'KiCad':
+        syms = symbols_to_list(lib.uri)
+        if syms:
+            for sym in syms:
+                print(f'{lib.name}:{sym}')
+                f.write(f'{lib.name}:{sym}\n')
+
+def load_envs(args):
+    if args.e:
+        with open(args.e, 'rb') as settings:
+            envs = tomli.load(settings)
+        for k, v in envs.items():
+            envs[k] = pathlib.Path(v).as_posix()
+        return envs
+    else:
+        return None
+
+def table_to_dict(filename, envs = None):
+    p = r'\${(.*)}'
     lib = LibTable.from_file(filename)
 
-    # with open(filename, 'r') as f:
-        # lib_table = f.read()
-    
-    check_env = '\n'.join([l.uri for l in lib.libs])
-    # check for env fields
-    p = r'\${.*}'
-    m = re.findall(p, check_env)
-    envs = {env: None for env in m}
-
-    # ask for env field values
-    for env, _ in envs.items():
-        env_cleaned = env.strip('$').strip('}').strip('{')
-        envs[env] = input(f'Please enter the path for {env_cleaned}: ')
-
-    # and build pattern
-    pattern = '|'.join(sorted(re.escape(k) for k in envs))
-
     # replace envs
     for l in lib.libs:
-        l.uri = re.sub(pattern, lambda m: envs[m.group(0)], l.uri)
-
-    # TODO: remove power symbols and not on board symbols
+        m = re.search(p, l.uri)
+        if m: #found env
+            try:
+                l.uri = re.sub(p, fr'{envs[m.group(1)]}', l.uri) #replace it
+            except KeyError:
+                envs[m.group(1)] = pathlib.Path(input(f'Please enter the path for {m.group(1)}: ')).as_posix() # if not found, ask for replacement value
+                l.uri = re.sub(p, envs[m.group(1)], l.uri) # and replace it
 
     return lib
 
@@ -68,22 +86,7 @@ def symbols_to_list(path):
     
     symlst = [s.entryName for s in sym.symbols if (s.inBom and not s.isPower)]
 
-    pass
-
-    # with open(path, 'r') as sym_f:
-    #     symbols = sym_f.read()
-    
-    # symlst = []
-
-    # p = r'symbol "([^"]*)"'
-    # level = 0
-    # for line in symbols.splitlines():
-    #     level += line.count('(') - line.count(')')
-    #     name = re.search(p, line)
-    #     if name and level == 2:
-    #         symlst.append(name[1])
-    #     # print(f' {level:2} |\t{line}')
-    pass
+    return symlst
 
 if __name__ == '__main__':
     main()
\ No newline at end of file