2 files changed, 123 insertions, 0 deletions
diff --git a/src/detection/terminaltheme/terminaltheme.c b/src/detection/terminaltheme/terminaltheme.c
new file mode 100644
index 0000000..e609754
--- /dev/null
+++ b/src/detection/terminaltheme/terminaltheme.c
@@ -0,0 +1,105 @@
+#include "terminaltheme.h"
+#include "common/io.h"
+#include "common/strutil.h"
+
+#include <inttypes.h>
+
+static bool detectByEscapeCode(FFTerminalThemeResult* result) {
+    // Windows Terminal removes all `\e`s in its output
+    if (ffGetTerminalResponse("\e]10;?\e\\" /*fg*/ "\e]11;?\e\\" /*bg*/,
+            6,
+            "%*[^0-9]10;rgb:%" SCNx16 "/%" SCNx16 "/%" SCNx16 /*"\e\\"*/ "%*[^0-9]11;rgb:%" SCNx16 "/%" SCNx16 "/%" SCNx16 /*"\e\\"*/,
+            &result->fg.r,
+            &result->fg.g,
+            &result->fg.b,
+            &result->bg.r,
+            &result->bg.g,
+            &result->bg.b) == NULL) {
+        if (result->fg.r > 0x0100 || result->fg.g > 0x0100 || result->fg.b > 0x0100) {
+            result->fg.r /= 0x0100, result->fg.g /= 0x0100, result->fg.b /= 0x0100;
+        }
+        if (result->bg.r > 0x0100 || result->bg.g > 0x0100 || result->bg.b > 0x0100) {
+            result->bg.r /= 0x0100, result->bg.g /= 0x0100, result->bg.b /= 0x0100;
+        }
+    } else {
+        return false;
+    }
+
+    return true;
+}
+
+static FFTerminalThemeColor fgbgToColor(int num) {
+    // https://github.com/dalance/termbg/blob/13c478a433fa182e65c401d26a1e7792a7f7f453/src/lib.rs#L251
+    switch (num) {
+        case 0:
+            return (FFTerminalThemeColor) { 0, 0, 0, false }; // black
+        case 1:
+            return (FFTerminalThemeColor) { 205, 0, 0, false }; // red
+        case 2:
+            return (FFTerminalThemeColor) { 0, 205, 0, false }; // green
+        case 3:
+            return (FFTerminalThemeColor) { 205, 205, 0, false }; // yellow
+        case 4:
+            return (FFTerminalThemeColor) { 0, 0, 238, false }; // blue
+        case 5:
+            return (FFTerminalThemeColor) { 205, 0, 205, false }; // magenta
+        case 6:
+            return (FFTerminalThemeColor) { 0, 205, 205, false }; // cyan
+        case 7:
+            return (FFTerminalThemeColor) { 229, 229, 229, false }; // white
+
+        case 8:
+            return (FFTerminalThemeColor) { 127, 127, 127, false }; // bright black
+        case 9:
+            return (FFTerminalThemeColor) { 255, 0, 0, false }; // bright red
+        case 10:
+            return (FFTerminalThemeColor) { 0, 255, 0, false }; // bright green
+        case 11:
+            return (FFTerminalThemeColor) { 255, 255, 0, false }; // bright yellow
+        case 12:
+            return (FFTerminalThemeColor) { 92, 92, 255, false }; // bright blue
+        case 13:
+            return (FFTerminalThemeColor) { 255, 0, 255, false }; // bright magenta
+        case 14:
+            return (FFTerminalThemeColor) { 0, 255, 255, false }; // bright cyan
+        case 15:
+            return (FFTerminalThemeColor) { 255, 255, 255, false }; // bright white
+
+        default:
+            return (FFTerminalThemeColor) { 0, 0, 0, false }; // invalid
+    }
+}
+
+static bool detectByEnv(FFTerminalThemeResult* result) {
+    const char* color = getenv("COLORFGBG"); // 7;0
+
+    if (!ffStrSet(color)) {
+        return false;
+    }
+
+    int f, g;
+    if (sscanf(color, "%d;%d", &f, &g) != 2) {
+        return false;
+    }
+
+    result->fg = fgbgToColor(f);
+    result->bg = fgbgToColor(g);
+    return true;
+}
+
+static inline bool detectColor(FFTerminalThemeResult* result, bool forceEnv) {
+    if (!forceEnv && detectByEscapeCode(result)) {
+        return true;
+    }
+
+    return detectByEnv(result);
+}
+
+bool ffDetectTerminalTheme(FFTerminalThemeResult* result, bool forceEnv) {
+    if (!detectColor(result, forceEnv)) {
+        return false;
+    }
+    result->fg.dark = result->fg.r * 299 + result->fg.g * 587 + result->fg.b * 114 < 128000;
+    result->bg.dark = result->bg.r * 299 + result->bg.g * 587 + result->bg.b * 114 < 128000;
+    return true;
+}
diff --git a/src/detection/terminaltheme/terminaltheme.h b/src/detection/terminaltheme/terminaltheme.h
new file mode 100644
index 0000000..a2808dc
--- /dev/null
+++ b/src/detection/terminaltheme/terminaltheme.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "fastfetch.h"
+#include "modules/terminaltheme/option.h"
+
+typedef struct FFTerminalThemeColor {
+    uint16_t r;
+    uint16_t g;
+    uint16_t b;
+    bool dark;
+} FFTerminalThemeColor;
+
+typedef struct FFTerminalThemeResult {
+    FFTerminalThemeColor fg;
+    FFTerminalThemeColor bg;
+} FFTerminalThemeResult;
+
+bool ffDetectTerminalTheme(FFTerminalThemeResult* result, bool forceEnv);