Adds unittest for autocompletion as snippets

Usually language servers do not treat autocomplete like this, they are
configured to register only the name of the function and then provide
signature help when completing (manually) the argument list.

I suspect that editors with limited UI support would not be able to have
that so instead a more traditional `Tab` completion is available.

CHANGELOG.md

@@ -1,5 +1,12 @@
 # CHANGELONG
 
+## 2.1.2
+
+### Fixed
+
+- Fixed code autocompletion bug with f-strings
+  ([#39](https://github.com/hansec/fortran-language-server/issues/39))
+
 ## 2.1.1
 
 ### Added

fortls/interface.py

@@ -152,7 +152,10 @@ def commandline_args(name: str = "fortls") -> argparse.ArgumentParser:
     group.add_argument(
         "--use_signature_help",
         action="store_true",
-        help="Use signature help instead of subroutine/function snippets",
+        help=(
+            "Use signature help instead of subroutine/function snippets. This"
+            " effectively sets --autocomplete_no_snippets"
+        ),
     )
 
     # Hover options ------------------------------------------------------------

test/setup_tests.py

@@ -24,7 +24,6 @@ def run_request(request, fortls_args: list[str] = None):
         sys.executable,
         str(root_dir / "fortls.py"),
         "--incremental_sync",
-        "--use_signature_help",
     ]
     if fortls_args:
         # Input args might not be sanitised, fix that

test/test_server.py

@@ -1,5 +1,3 @@
-from pathlib import Path
-
 # from types import NoneType
 from setup_tests import (
     path_to_uri,
@@ -233,6 +231,10 @@ def check_return(result_array, checks):
         if checks[0] > 0:
             assert result_array[0]["label"] == checks[1]
             assert result_array[0]["detail"] == checks[2]
+            try:
+                assert result_array[0]["insertText"] == checks[3]
+            except KeyError:
+                pass
 
     def comp_request(file_path, line, char):
         return write_rpc_request(
@@ -296,15 +298,23 @@ def comp_request(file_path, line, char):
     file_path = test_dir / "completion" / "test_vis_mod_completion.f90"
     string += comp_request(file_path, 12, 16)
     string += comp_request(file_path, 12, 24)
-    errcode, results = run_request(string)
+    errcode, results = run_request(string, ["--use_signature_help"])
+    assert errcode == 0
+
+    string = write_rpc_request(1, "initialize", {"rootPath": str(test_dir)})
+    file_path = test_dir / "test_prog.f08"
+    string += comp_request(file_path, 12, 6)
+    errcode, res = run_request(string)
     assert errcode == 0
+    results.extend(res[1:])
+
     #
     exp_results = (
         # test_prog.f08
-        [1, "myfun", "DOUBLE PRECISION FUNCTION myfun(n, xval)"],
-        [9, "glob_sub", "SUBROUTINE glob_sub(n, xval, yval)"],
-        [1, "bound_nopass", "SUBROUTINE bound_nopass(a, b)"],
-        [1, "bound_pass", "SUBROUTINE bound_pass(arg1)"],
+        [1, "myfun", "DOUBLE PRECISION FUNCTION myfun(n, xval)", "myfun"],
+        [9, "glob_sub", "SUBROUTINE glob_sub(n, xval, yval)", "glob_sub"],
+        [1, "bound_nopass", "SUBROUTINE bound_nopass(a, b)", "bound_nopass"],
+        [1, "bound_pass", "SUBROUTINE bound_pass(arg1)", "bound_pass"],
         [1, "stretch_vector", "TYPE(scaled_vector)"],
         [6, "scale", "TYPE(scale_type)"],
         [2, "n", "INTEGER(4)"],
@@ -337,7 +347,12 @@ def comp_request(file_path, line, char):
         [10, "READ", "STATEMENT"],
         [11, "READ", "STATEMENT"],
         # subdir/test_generic.f90
-        [4, "my_gen", "SUBROUTINE my_gen(self, a, b)"],
+        [
+            4,
+            "my_gen",
+            "SUBROUTINE my_gen(self, a, b)",
+            "my_gen(${1:self}, ${2:a}, ${3:b})",
+        ],
         # subdir/test_inherit.f90
         [1, "val", "REAL(8)"],
         # subdir/test_rename.F90
@@ -352,6 +367,14 @@ def comp_request(file_path, line, char):
         # completion/test_vis_mod_completion.f90
         [1, "some_var", "INTEGER"],
         [3, "length", "INTEGER"],
+        # test_prog.f08, completion without signature_help
+        # returns the entire completion as a snippet
+        [
+            1,
+            "myfun",
+            "DOUBLE PRECISION FUNCTION myfun(n, xval)",
+            "myfun(${1:n}, ${2:xval})",
+        ],
     )
     assert len(exp_results) + 1 == len(results)
     for i in range(len(exp_results)):