feat: add diagnostic support for vhdl with vcom and ghdl

lua/null-ls/builtins/diagnostics/ghdl.lua

@@ -0,0 +1,32 @@
+local h = require("null-ls.helpers")
+local methods = require("null-ls.methods")
+
+local DIAGNOSTICS = methods.internal.DIAGNOSTICS
+
+return h.make_builtin({
+    name = "ghdl",
+    meta = {
+        url = "https://github.com/ghdl/ghdl",
+        description = "Adds support for `ghdl` VHDL compiler/checker",
+    },
+    method = DIAGNOSTICS,
+    filetypes = { "vhdl" },
+    generator_opts = {
+        command = "ghdl",
+        to_stdin = false,
+        to_temp_file = true,
+        from_stderr = true,
+        args = { "-a", "--std=08", "--workdir=/tmp", "$FILENAME" },
+        format = "line",
+        on_output = h.diagnostics.from_pattern(
+        [[([^:]+):(%d+):(%d+):%s+(.+)]],
+        { 'filename', 'row', 'col', 'message'},
+        {
+            severities = {
+                E = h.diagnostics.severities["error"],
+            },
+        }
+        ),
+    },
+    factory = h.generator_factory,
+})

lua/null-ls/builtins/diagnostics/vcom.lua

@@ -0,0 +1,34 @@
+local h = require("null-ls.helpers")
+local methods = require("null-ls.methods")
+
+local DIAGNOSTICS = methods.internal.DIAGNOSTICS
+
+return h.make_builtin({
+    name = "vcom",
+    meta = {
+        url = "https://eda.sw.siemens.com/en-US/ic/modelsim/",
+        description = "Adds support for Mentor Graphics Questa/ModelSim `vcom` VHDL compiler/checker",
+        notes = "If you want the work directory to be in the current working directory, remove '-work' and '/tmp/vcom_work' from the args list",
+    },
+    method = DIAGNOSTICS,
+    filetypes = { "vhdl" },
+    generator_opts = {
+        command = "vcom",
+        args = { "-2008", "-quiet", "-lint", "-work", "/tmp/vcom_work", "$FILENAME" },
+        to_stdin = false,
+        to_temp_file = true,
+        from_stderr = true,
+        format = "line",
+        on_output = h.diagnostics.from_pattern(
+        [[^**%s(%w+):[%a%d%s%.-_/]+%((%d+)%):%s+(.+)]],
+        {"severity", "row", "message" },
+        {
+            severities = {
+                E = h.diagnostics.severities["Error"],
+                W = h.diagnostics.severities["Warning"],
+            },
+        }
+        ),
+    },
+    factory = h.generator_factory,
+})