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action: expand shell variables before execvp()

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Expanding shell variables, including tilde, enables the following type
of keybind:

<keyboard>
    <keybind key="XF86AudioMute">
      <action name="Execute">
        <command>bash ~/mute-script.sh</command>
      </action>
    </keybind>
</keyboard>

Fixes issue #32
This commit is contained in:
Johan Malm 2021-06-30 19:56:31 +01:00
parent a1ae16c1cf
commit afe666fd6e
3 changed files with 60 additions and 4 deletions
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44
src/common/buf.c
View file

@ -1,5 +1,49 @@
#include <ctype.h>
#include "common/buf.h"
void
buf_expand_shell_variables(struct buf *s)
{
struct buf new;
struct buf environment_variable;
buf_init(&new);
buf_init(&environment_variable);
for (int i = 0 ; i < s->len ; i++) {
if (s->buf[i] == '$') {
/* expand environment variable */
environment_variable.len = 0;
buf_add(&environment_variable, s->buf + i + 1);
char *p = environment_variable.buf;
while (isalnum(*p)) {
++p;
}
*p = '\0';
p = getenv(environment_variable.buf);
if (!p) {
goto out;
}
buf_add(&new, p);
i += strlen(environment_variable.buf);
} else if (s->buf[i] == '~') {
/* expand tilde */
buf_add(&new, getenv("HOME"));
} else {
/* just add one character at a time */
if (new.alloc <= new.len + 1) {
new.alloc = new.alloc * 3/2 + 16;
new.buf = realloc(new.buf, new.alloc);
}
new.buf[new.len++] = s->buf[i];
new.buf[new.len] = '\0';
}
}
out:
free(environment_variable.buf);
free(s->buf);
s->buf = new.buf;
}
void
buf_init(struct buf *s)
{