Fix for building on msys2; Closes #795

docs/source/cli.rst

@@ -98,6 +98,11 @@ Environment Variables
    If :envvar:`XDG_CONFIG_HOME` is not set, lnav will use this directory
    to store its configuration in a sub-directory named :file:`.lnav`.
 
+.. envvar:: APPDATA
+
+   On Windows, lnav will use this directory instead of HOME
+   to store its configuration in a sub-directory named :file:`.lnav`.
+
 .. envvar:: TZ
 
    The timezone setting is used in some log formats to convert UTC timestamps

src/base/paths.cc

@@ -37,7 +37,11 @@ namespace paths {
 
 ghc::filesystem::path dotlnav()
 {
+#ifdef __CYGWIN__
+    auto home_env = getenv("APPDATA");
+#else
     auto home_env = getenv("HOME");
+#endif
     auto xdg_config_home = getenv("XDG_CONFIG_HOME");
 
     if (home_env != nullptr) {

src/lnav.cc

@@ -32,6 +32,10 @@
  * a bit.
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include <stdio.h>

src/shlex.cc

@@ -29,6 +29,10 @@
  * @file shlex.cc
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include "shlex.hh"

src/string-extension-functions.cc

@@ -7,6 +7,10 @@
  * commercial or non-commercial, and by any means.
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include <stdlib.h>

src/tools/bin2c.c

@@ -7,6 +7,10 @@
 // whatever you want with this stuff.  If we meet some day, and you think this stuff is
 // worth it, you can buy me a beer in return.  Sandro Sigala
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include <ctype.h>
 #include <fcntl.h>
 #include <stdio.h>

src/view_curses.cc

@@ -29,6 +29,10 @@
  * @file view_curses.cc
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include <cmath>

src/yajlpp/json_ptr.cc

@@ -29,6 +29,10 @@
  * @file json_ptr.cc
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include "yajl/api/yajl_gen.h"

test/drive_data_scanner.cc

@@ -27,6 +27,10 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifdef __CYGWIN__
+#include <alloca.h>
+#endif
+
 #include "config.h"
 
 #include <stdio.h>