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Add $NCDU_LEVEL environment variable when spawning a shell

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Similar to $SHLVL and $RANGER_LEVEL.
This commit is contained in:
Yorhel 2021-05-12 16:30:31 +02:00
parent e278660464
commit a6b4aead43
2 changed files with 23 additions and 0 deletions
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6
doc/ncdu.pod
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@ -287,6 +287,12 @@ run ncdu as follows:
export NCDU_SHELL=vifm export NCDU_SHELL=vifm
ncdu ncdu
Ncdu will set the C<NCDU_LEVEL> environment variable or increment it before
spawning the shell. This variable allows you to detect when your shell is
running from within ncdu, which can be useful to avoid nesting multiple
instances of ncdu. Ncdu itself does not (currently) warn when attempting to run
nested instances.
=item q =item q
Quit Quit

17
src/shell.c
View file

@ -34,6 +34,22 @@
#include <unistd.h> #include <unistd.h>
#include <sys/wait.h> #include <sys/wait.h>
static void set_level(void) {
static int done = 0;
char nlvl[2];
if(done)
return;
const char *lvl = getenv("NCDU_LEVEL");
// too lazy to count beyond 9
if(lvl && *lvl >= '1' && *lvl < '9' && lvl[1] == 0) {
nlvl[0] = 1 + *lvl;
nlvl[1] = 0;
setenv("NCDU_LEVEL", nlvl, 1);
} else
setenv("NCDU_LEVEL", "1", 1);
done++;
}
void shell_draw() { void shell_draw() {
const char *full_path; const char *full_path;
int res; int res;
@ -59,6 +75,7 @@ void shell_draw() {
shell = DEFAULT_SHELL; shell = DEFAULT_SHELL;
} }
set_level();
res = system(shell); res = system(shell);
/* resume ncurses mode */ /* resume ncurses mode */