Some improvements

examples/dependencies.tm

@@ -1,24 +1,50 @@
-# Show dependency graph
+# Show a Tomo dependency graph
 use file
 
-func build_dependency_graph(filename:Text, dependencies:&{Text:@{Text}}):
+USAGE := "Usage: dependencies <files...>"
+
+HELP := "
+    dependencies: Show a file dependency graph for Tomo source files.
+    $USAGE
+"
+
+func build_dependency_graph(filename:Text, dependencies:&{Text:@{Text}}, module=""):
     reader := when LineReader.from_file(filename) is Failure(msg):
+        !! Failed: $msg
         return
     is Open(reader): reader
 
+    key := if module: module else: filename
+    if not dependencies:has(key):
+        dependencies:set(key, @{:Text})
+
     while when reader:next_line() is Success(line):
-        if line:matches($/{start}use {..}.tm/):
+        if line:matches($/use {..}.tm/):
-            import := line:replace($/{start}use {..}/, "\2")
+            import := line:replace($/use {..}/, "\1")
             resolved := relative_path(resolve_path(import, filename))
             if resolved != "":
                 import = resolved
 
-            if not dependencies:has(filename):
+            dependencies:get(key):add(import)
-                dependencies:set(filename, @{:Text})
 
-            dependencies:get(filename):add(import)
             if not dependencies:has(import):
                 build_dependency_graph(import, dependencies)
+        else if line:matches($/use {id}/):
+            import := line:replace($/use {..}/, "\1")
+
+            dependencies:get(key):add(import)
+            files_path := resolve_path("~/.local/src/tomo/$import/lib$(import).files")
+            if files_path == "":
+                !! couldn't resolve: $files_path
+            skip if files_path == ""
+            when read(files_path) is Failure(msg):
+                !! couldn't read: $files_path $msg
+                skip
+            is Success(files_content):
+                for line in files_content:lines():
+                    line_resolved := resolve_path(line, relative_to="~/.local/src/tomo/$import/")
+                    skip if line_resolved == ""
+                    build_dependency_graph(line_resolved, dependencies, module=import)
 
 func get_dependency_graph(file:Text)->{Text:{Text}}:
     graph := {:Text:@{Text}}
@@ -27,8 +53,12 @@ func get_dependency_graph(file:Text)->{Text:{Text}}:
     return {f:deps[] for f,deps in graph}
 
 func draw_tree(file:Text, dependencies:{Text:{Text}}, already_printed:&{Text}, prefix="", is_last=yes):
-    color_file := if resolve_path(file): file else: "$\x1b[31;1m$file$\x1b[m"
+    color_file := if file:matches($/{id}/):
-
+        "$\x1b[34;1m$file$\x1b[m"
+    else if resolve_path(file) != "":
+        file
+    else:
+        "$\x1b[31;1m$file (could not resolve)$\x1b[m"
 
     if already_printed:has(file):
         say(prefix ++ (if is_last: "└── " else: "├── ") ++ color_file ++ " $\x1b[2m(recursive)$\x1b[m")

examples/file.tm

@@ -38,6 +38,7 @@ func read(path:Text)->FileReadResult:
                 char *gc_mem = GC_MALLOC_ATOMIC(sb.st_size+1);
                 memcpy(gc_mem, mem, sb.st_size);
                 gc_mem[sb.st_size] = '\0';
+                close(fd);
                 return file$FileReadResult$tagged$Success(Text$from_strn(gc_mem, sb.st_size));
             } else {
                 const int chunk_size = 256;
@@ -130,7 +131,10 @@ struct LineReader(_file:@Memory):
                 char *buf = NULL;
                 size_t space = 0;
                 ssize_t len = getline(&buf, &space, *(FILE**)$r.$_file);
-                if (len < 0) return (file$FileReadResult_t){1, .$Failure={Text("End of file")}};
+                if (len < 0) {
+                    file$_close_file($r.$_file);
+                    return (file$FileReadResult_t){1, .$Failure={Text("End of file")}};
+                }
                 if (len > 0 && buf[len-1] == '\n') --len;
                 char *line = GC_MALLOC_ATOMIC(len + 1);
                 memcpy(line, buf, len);
@@ -185,6 +189,7 @@ func command(cmd:Text)->FileReadResult:
                         buf = GC_MALLOC_ATOMIC(chunk_size);
                     }
                 } while (just_read > 0);
+                pclose($f);
                 contents;
             })
         ):Text