From 758a0611d098876ca93ae49179148f5ef5cf1b06 Mon Sep 17 00:00:00 2001
From: Uko Kokņevičs
Date: Fri, 31 Dec 2021 21:02:23 +0200
Subject: Now can do soft tabs yay

---
 build.zig         |  4 +++-
 es.ini.in         |  1 +
 src/Buffer.zig    | 15 +++++++++++++++
 src/Config.zig    | 16 +++++++++++++++-
 src/key_state.zig |  2 ++
 5 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/build.zig b/build.zig
index 6fac7d1..d65020a 100644
--- a/build.zig
+++ b/build.zig
@@ -10,9 +10,10 @@ const version = "0.3.0";
 const config = struct {
     template: []const u8 = @embedFile("es.ini.in"),
     default: struct {
+        hard_tabs: bool = false,
         line_limit: usize = 100,
         page_overlap: usize = 2,
-        tab_stop: usize = 8,
+        tab_stop: usize = 4,
     } = .{},
 }{};
 
@@ -38,6 +39,7 @@ pub fn build(b: *Builder) void {
         "es_version",
         SemanticVersion.parse(version) catch unreachable,
     );
+    options.addOption(bool, "default_hard_tabs", config.default.hard_tabs);
     options.addOption(usize, "default_line_limit", config.default.line_limit);
     options.addOption(usize, "default_page_overlap", config.default.page_overlap);
     options.addOption(usize, "default_tab_stop", config.default.tab_stop);
diff --git a/es.ini.in b/es.ini.in
index 8b4e6c0..99a37d5 100644
--- a/es.ini.in
+++ b/es.ini.in
@@ -2,6 +2,7 @@
 #
 # Copy this config to ~/.config/arkta/es/es.ini to modify it.
 
+hard-tabs = {[hard_tabs]}
 line-limit = {[line_limit]}
 page-overlap = {[page_overlap]}
 tab-stop = {[tab_stop]}
diff --git a/src/Buffer.zig b/src/Buffer.zig
index cb89935..f105c55 100644
--- a/src/Buffer.zig
+++ b/src/Buffer.zig
@@ -291,6 +291,13 @@ pub fn insertChar(self: *Buffer, char: u8) !void {
     self.dirty = true;
 }
 
+pub fn insertNChars(self: *Buffer, char: u8, count: usize) !void {
+    var remaining = count;
+    while (remaining > 0) : (remaining -= 1) {
+        try self.insertChar(char);
+    }
+}
+
 pub fn insertNewline(self: *Buffer) !void {
     self.dirty = true;
 
@@ -331,6 +338,14 @@ pub fn insertRow(self: *Buffer, at: usize, data: []const u8) !void {
     self.dirty = true;
 }
 
+pub fn insertTab(self: *Buffer) !void {
+    if (self.config.hard_tabs) {
+        return self.insertChar('\t');
+    } else {
+        return self.insertNChars(' ', self.config.tab_stop - self.cx % self.config.tab_stop);
+    }
+}
+
 pub fn killLine(self: *Buffer) !void {
     return self.deleteRow(self.cy);
 }
diff --git a/src/Config.zig b/src/Config.zig
index 16b4043..071c31b 100644
--- a/src/Config.zig
+++ b/src/Config.zig
@@ -9,6 +9,7 @@ const Config = @This();
 
 const config_path = "arkta/es/es.ini";
 
+hard_tabs: bool = conf.default_hard_tabs,
 line_limit: usize = conf.default_line_limit,
 page_overlap: usize = conf.default_page_overlap,
 tab_stop: usize = conf.default_tab_stop,
@@ -42,6 +43,17 @@ pub fn readConfig(allocator: Allocator) !Config {
     return config;
 }
 
+fn parseBool(str: []const u8) !bool {
+    if (std.mem.eql(u8, str, "true")) {
+        return true;
+    } else if (std.mem.eql(u8, str, "false")) {
+        return false;
+    } else {
+        std.log.err("How to interpret '{s}' as a bool?", .{str});
+        return error.MalformedConfig;
+    }
+}
+
 fn readConfigInBaseDir(allocator: Allocator, config: *Config, base_dir: []const u8) !void {
     const filename = try std.fs.path.join(allocator, &.{ base_dir, config_path });
     defer allocator.free(filename);
@@ -67,7 +79,9 @@ fn readConfigInBaseDir(allocator: Allocator, config: *Config, base_dir: []const
 
         const key = std.mem.trimRight(u8, line[0..split], &std.ascii.spaces);
         const value = std.mem.trimLeft(u8, line[(split + 1)..], &std.ascii.spaces);
-        if (std.mem.eql(u8, key, "line-limit")) {
+        if (std.mem.eql(u8, key, "hard-tabs")) {
+            config.hard_tabs = try parseBool(value);
+        } else if (std.mem.eql(u8, key, "line-limit")) {
             config.line_limit = try std.fmt.parseUnsigned(usize, value, 0);
         } else if (std.mem.eql(u8, key, "page-overlap")) {
             config.page_overlap = try std.fmt.parseUnsigned(usize, value, 0);
diff --git a/src/key_state.zig b/src/key_state.zig
index 0ea30cb..d477094 100644
--- a/src/key_state.zig
+++ b/src/key_state.zig
@@ -77,6 +77,8 @@ pub fn defaultState(editor: *Editor, buf: *Buffer, key: Key) Error!void {
 
         // TODO: C-h help
 
+        // tab
+        Key.ctrl('i') => try buf.insertTab(),
         // line feed
         Key.ctrl('j') => try buf.insertNewline(),
         Key.ctrl('k') => try buf.killLine(),
-- 
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