add set_loglevel_from_env() #2277

src/lib/direct.c

@@ -909,6 +909,7 @@ ncdirect* ncdirect_core_init(const char* termtype, FILE* outfp, uint64_t flags){
   }else{
     loglevel = NCLOGLEVEL_SILENT;
   }
+  set_loglevel_from_env(&loglevel);
   int cursor_y = -1;
   int cursor_x = -1;
   if(interrogate_terminfo(&ret->tcache, ret->ttyfp, utf8, 1,

src/lib/internal.h

@@ -1746,6 +1746,10 @@ emit_scrolls(const tinfo* ti, int count, fbuf* f){
 // replace or populate the TERM environment variable with 'termname'
 int putenv_term(const char* termname) __attribute__ ((nonnull (1)));
 
+// check environment for NOTCURSES_LOGLEVEL, and use it if defined.
+int set_loglevel_from_env(ncloglevel_e* loglevel)
+  __attribute__ ((nonnull (1)));
+
 #undef API
 #undef ALLOC
 

src/lib/notcurses.c

@@ -1002,6 +1002,7 @@ notcurses* notcurses_core_init(const notcurses_options* opts, FILE* outfp){
   ret->rstate.f.used = 0;
   ret->rstate.f.size = 0;
   ret->loglevel = opts->loglevel;
+  set_loglevel_from_env(&ret->loglevel);
   if(!(opts->flags & NCOPTION_INHIBIT_SETLOCALE)){
     init_lang();
   }

src/lib/util.c

@@ -8,6 +8,22 @@
 #endif
 #include "internal.h"
 
+int set_loglevel_from_env(ncloglevel_e* llptr){
+  const char* ll = getenv("NOTCURSES_LOGLEVEL");
+  if(ll == NULL){
+    return 0;
+  }
+  char* endl;
+  long l = strtol(ll, &endl, 10);
+  if(l < NCLOGLEVEL_PANIC || l > NCLOGLEVEL_TRACE){
+    logpanic("Illegal NOTCURSES_LOGLEVEL: %s\n", ll);
+    return -1;
+  }
+  *llptr = l;
+  loginfo("Got loglevel from environment: %ld\n", l);
+  return 0;
+}
+
 char* notcurses_accountname(void){
 #ifndef __MINGW64__
   const char* un;