shithub: riscv

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file(1): recognise unified diff output

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -167,6 +167,7 @@

 int	istar(void);

 int	isface(void);

 int	isexec(void);

+int	isudiff(void);

 int	p9bitnum(char*, int*);

 int	p9subfont(uchar*);

 void	print_utf(void);

@@ -183,6 +184,7 @@

 	iff,		/* interchange file format (strings) */

 	longoff,	/* recognizable by 4 bytes at some offset */

 	isoffstr,	/* recognizable by string at some offset */

+	isudiff,	/* unified diff output */

 	isrfc822,	/* email file */

 	ismbox,		/* mail box */

 	istar,		/* recognizable by tar checksum */

@@ -981,6 +983,25 @@

 	"a", "b", "i", "p", "q", "u",

 	0,

 };

+

+int

+isudiff(void)

+{

+	char *p;

+

+	p = (char*)buf;

+	if((p = strstr(p, "diff")) != nil)

+	if((p = strchr(p, '\n')) != nil)

+	if(strncmp(++p, "--- ", 4) == 0)

+	if((p = strchr(p, '\n')) != nil)

+	if(strncmp(++p, "+++ ", 4) == 0)

+	if((p = strchr(p, '\n')) != nil)

+	if(strncmp(++p, "@@ ", 3) == 0){

+		print("%s\n", mime ? "text/plain" : "unified diff output");

+		return 1;

+	}

+	return 0;

+}

 int

 ishtml(void)