From 0a75daceecb15eb1ac4ff1497ff005b017ce279b Mon Sep 17 00:00:00 2001
From: Tim Stack <timothyshanestack@gmail.com>
Date: Fri, 25 Aug 2023 22:48:26 -0700
Subject: [PATCH] [doc] disable guidelines when sane indents are not detected

---
 src/document.sections.cc | 21 +++++++++++++++++++++
 src/text_format.cc       |  6 ++++++
 src/text_format.hh       |  4 ++++
 3 files changed, 31 insertions(+)

diff --git a/src/document.sections.cc b/src/document.sections.cc
index 70bcdf3f..f4b07896 100644
--- a/src/document.sections.cc
+++ b/src/document.sections.cc
@@ -453,6 +453,27 @@ public:
             this->sw_hier_stage->hn_parent = nullptr;
         }
 
+        if (!this->sw_indents.empty()) {
+            auto low_indent_iter = this->sw_indents.begin();
+
+            if (*low_indent_iter == 1) {
+                // adding guides for small indents is noisy, drop for now
+                this->sw_indents.clear();
+            } else {
+                auto lcm = *low_indent_iter;
+
+                for (auto indent_iter = this->sw_indents.begin();
+                     indent_iter != this->sw_indents.end();)
+                {
+                    if ((*indent_iter % lcm) == 0) {
+                        ++indent_iter;
+                    } else {
+                        indent_iter = this->sw_indents.erase(indent_iter);
+                    }
+                }
+            }
+        }
+
         mb.mb_root_node = std::move(this->sw_hier_stage);
         mb.mb_intervals = std::move(this->sw_intervals);
         mb.mb_type_intervals = std::move(this->sw_type_intervals);
diff --git a/src/text_format.cc b/src/text_format.cc
index 4a109db2..e86c34d7 100644
--- a/src/text_format.cc
+++ b/src/text_format.cc
@@ -64,6 +64,7 @@ detect_text_format(string_fragment sf,
     static const auto XML_EXT = ghc::filesystem::path(".xml");
     static const auto YAML_EXT = ghc::filesystem::path(".yaml");
     static const auto YML_EXT = ghc::filesystem::path(".yml");
+    static const auto MAKEFILE_STEM = ghc::filesystem::path("Makefile");
     static const auto MD_EXT = ghc::filesystem::path(".md");
     static const auto MARKDOWN_EXT = ghc::filesystem::path(".markdown");
 
@@ -124,6 +125,7 @@ detect_text_format(string_fragment sf,
             path = path->stem();
         }
 
+        auto stem = path->stem();
         auto ext = path->extension();
         if (ext == MD_EXT || ext == MARKDOWN_EXT) {
             return text_format_t::TF_MARKDOWN;
@@ -156,6 +158,10 @@ detect_text_format(string_fragment sf,
         if (ext == XML_EXT) {
             return text_format_t::TF_XML;
         }
+
+        if (stem == MAKEFILE_STEM) {
+            return text_format_t::TF_MAKEFILE;
+        }
     }
 
     {
diff --git a/src/text_format.hh b/src/text_format.hh
index a923fb36..9a7a05eb 100644
--- a/src/text_format.hh
+++ b/src/text_format.hh
@@ -47,6 +47,7 @@ enum class text_format_t {
     TF_JAVA,
     TF_JSON,
     TF_LOG,
+    TF_MAKEFILE,
     TF_MAN,
     TF_MARKDOWN,
     TF_PYTHON,
@@ -95,6 +96,9 @@ struct formatter<text_format_t> : formatter<string_view> {
             case text_format_t::TF_JSON:
                 name = "application/json";
                 break;
+            case text_format_t::TF_MAKEFILE:
+                name = "text/x-makefile";
+                break;
             case text_format_t::TF_MAN:
                 name = "text/man";
                 break;