Support detecting the mintty terminal application

This is the default terminal used by Git Bash on Windows. See
http://mintty.github.io/.

Author: sschuberth

mordant/src/commonMain/kotlin/com/github/ajalt/mordant/terminal/TerminalDetection.kt

@@ -14,11 +14,18 @@ internal object TerminalDetection {
     ): TerminalInfo {
         // intellij console is interactive, even though isatty returns false
         val ij = isIntellijRunActionConsole()
-        val inputInteractive = interactive ?: (ij || stdinInteractive())
-        val outputInteractive = interactive ?: (ij || stdoutInteractive())
+
+        // https://github.com/mintty/mintty/issues/482
+        val mintty = isMinttyTerminal()
+
+        val inputInteractive = interactive ?: (ij || mintty || stdinInteractive())
+        val outputInteractive = interactive ?: (ij || mintty || stdoutInteractive())
+
         val level = ansiLevel ?: ansiLevel(outputInteractive)
         val ansiHyperLinks = hyperlinks ?: (outputInteractive && level != NONE && ansiHyperLinks())
+
         val (w, h) = detectInitialSize()
+
         return TerminalInfo(
             width = width ?: w,
             height = height ?: h,
@@ -45,6 +52,7 @@ internal object TerminalDetection {
         return forcedColor() != NONE && (isWindowsTerminal() || when (getTermProgram()) {
             "hyper", "wezterm" -> true
             "iterm.app" -> iTermVersionSupportsTruecolor()
+            "mintty" -> minttyVersionSupportsHyperlinks()
             else -> when (getTerm()) {
                 "xterm-kitty", "alacritty" -> true
                 else -> false
@@ -82,6 +90,7 @@ internal object TerminalDetection {
             "hyper" -> return TRUECOLOR
             "apple_terminal" -> return ANSI256
             "iterm.app" -> return if (iTermVersionSupportsTruecolor()) TRUECOLOR else ANSI256
+            "mintty" -> return TRUECOLOR
             "wezterm" -> return TRUECOLOR
         }
 
@@ -161,6 +170,14 @@ internal object TerminalDetection {
         return ver != null && ver >= 3
     }
 
+    private fun minttyVersionSupportsHyperlinks(): Boolean {
+        val ver = getEnv("TERM_PROGRAM_VERSION")?.split(".")?.mapNotNull { it.toIntOrNull() }
+        if (ver == null || ver.size != 3) return false
+
+        // https://github.com/mintty/mintty/issues/823#issuecomment-473096464
+        return (ver[0] > 2) || (ver[0] == 2 && ver[1] > 9) || (ver[0] == 2 && ver[1] == 9 && ver[2] > 6)
+    }
+
     private fun isCI(): Boolean {
         return getEnv("CI") != null
     }
@@ -182,4 +199,8 @@ internal object TerminalDetection {
         // their terminal tab. In the latter case, the JediTerm envvar is set, in the former it's missing.
         return !isJediTerm() && runningInIdeaJavaAgent()
     }
+
+    private fun isMinttyTerminal(): Boolean {
+        return getEnv("TERM_PROGRAM") == "mintty"
+    }
 }