Add shell option

doc/ctpv.1

@@ -267,8 +267,9 @@ Example:
 .
 .IP
 .EX
-# Set an option
+# Set some options
 set forcekitty
+set shell "/usr/bin/bash"
 .sp
 # Add a new preview
 preview cow .moo {{
@@ -288,6 +289,16 @@ An option can be set using
 command.
 .
 .TP
+.BR shell \~\c
+.I path
+Use
+.I path
+as a path to a shell to run previews with.
+Use it if you have a non-POSIX compliant shell installed as a default shell.
+The setting defaults to
+.BR /bin/sh .
+.
+.TP
 .B forcekitty
 Always use
 .I Kitty

src/config.c

@@ -1,3 +1,5 @@
+#include <unistd.h>
+
 #include "ctpv.h"
 #include "lexer.h"
 #include "error.h"
@@ -62,6 +64,7 @@ static struct Option options[] = {
     DEF_OPTION_BOOL(nosymlinkinfo),
     DEF_OPTION_BOOL(autochafa),
     DEF_OPTION_BOOL(showgpg),
+    DEF_OPTION_STR(shell),
 };
 
 static void any_type_null(char **s)
@@ -415,6 +418,8 @@ RESULT config_load(Parser **ctx, VectorPreview *prevs, char *filename)
 
     ERRCHK_GOTO_OK(parse(*ctx), ret, file);
 
+    ERRCHK_GOTO((access(ctpv.opts.shell, F_OK) != 0), ret, file, "shell '%s' was not found", ctpv.opts.shell);
+
 file:
     fclose(f);
 

src/ctpv.c

@@ -394,6 +394,8 @@ int main(int argc, char *argv[])
 {
     program = argc > 0 ? argv[0] : "ctpv";
 
+    ctpv.opts.shell = "/bin/sh";
+
     int c;
     while ((c = getopt(argc, argv, "s:c:e:lmv")) != -1) {
         switch (c) {

src/ctpv.h

@@ -17,6 +17,7 @@ struct CTPV {
     struct {
         int forcekitty, forcekittyanim, forcechafa, noimages, nosymlinkinfo;
         int autochafa, showgpg;
+        char *shell;
     } opts;
 };
 

src/lexer.c

@@ -240,6 +240,11 @@ static inline int issymbol(int c)
     return isalnum(c) || c == '_' || c == '-';
 }
 
+static inline int isnotquote(int c)
+{
+    return (c != '"');
+}
+
 static inline Token read_symbol(Lexer *ctx)
 {
     char c = peek_char(ctx);
@@ -256,6 +261,25 @@ static inline Token read_symbol(Lexer *ctx)
     return tok;
 }
 
+static inline Token read_string(Lexer *ctx)
+{
+    char c = next_char(ctx);
+
+    if (isnotquote(c))
+        return get_tok(ctx, TOK_NULL);
+
+    record_text(ctx);
+    read_while(ctx, isnotquote, 1);
+
+    Token tok = get_tok(ctx, TOK_STR);
+    tok.val.s = get_text(ctx);
+
+    // Skip ending quote
+    next_char(ctx);
+
+    return tok;
+}
+
 static inline Token read_int(Lexer *ctx)
 {
     int positive = 1;
@@ -395,6 +419,7 @@ Token lexer_get_token(Lexer *ctx)
     ATTEMPT_READ(ctx, read_symbol);
     ATTEMPT_READ(ctx, read_int);
     ATTEMPT_READ(ctx, read_block);
+    ATTEMPT_READ(ctx, read_string);
 
     PARSEERROR((*ctx), "cannot handle character: %c", peek_char(ctx));
     return get_tok(ctx, TOK_ERR);

src/shell.c

@@ -31,19 +31,23 @@ static char *prepend_helpers(char *str, size_t len)
     return buf;
 }
 
-#define OPT_SETENV(name) \
-    ERRCHK_RET_ERN(setenv((#name), ctpv.opts.name ? "1" : "", 1) == -1)
+#define OPT_SETENV_INT(name) \
+    ERRCHK_RET_ERN(setenv((#name), (ctpv.opts.name ? "1" : ""), 1) == -1)
+
+#define OPT_SETENV_STR(name) \
+    ERRCHK_RET_ERN(setenv((#name), (ctpv.opts.name ? ctpv.opts.name : ""), 1) == -1)
 
 RESULT run_script(char *script, size_t script_len, int *exitcode, int *signal,
                   SpawnProg sp, void *sp_arg)
 {
-    OPT_SETENV(forcekitty);
-    OPT_SETENV(forcekittyanim);
-    OPT_SETENV(forcechafa);
-    OPT_SETENV(noimages);
-    OPT_SETENV(nosymlinkinfo);
-    OPT_SETENV(autochafa);
-    OPT_SETENV(showgpg);
+    OPT_SETENV_INT(forcekitty);
+    OPT_SETENV_INT(forcekittyanim);
+    OPT_SETENV_INT(forcechafa);
+    OPT_SETENV_INT(noimages);
+    OPT_SETENV_INT(nosymlinkinfo);
+    OPT_SETENV_INT(autochafa);
+    OPT_SETENV_INT(showgpg);
+    OPT_SETENV_STR(shell);
 
     char *scr = prepend_helpers(script, script_len);
     char *args[] = SHELL_ARGS(scr);

src/shell.h

@@ -2,9 +2,10 @@
 #define SHELL_H
 
 #include "utils.h"
+#include "ctpv.h"
 
 #define SHELL_ARGS(script, ...) \
-    { "/bin/sh", "-c", script, "/bin/sh", __VA_ARGS__ __VA_OPT__(,) NULL }
+    { ctpv.opts.shell, "-c", script, ctpv.opts.shell, __VA_ARGS__ __VA_OPT__(,) NULL }
 
 RESULT run_script(char *script, size_t script_len, int *exitcode, int *signal,
                   SpawnProg sp, void *sp_arg);