From bb36535f1a932c7749e58f2abb1cc88364200258 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sat, 13 Jan 2024 01:06:03 +0100
Subject: Support glob arguments to git-grab

---
 grab.1 | 26 ++++++++++++++++++++++----
 grab.c | 25 +++++++++++++++++++------
 2 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/grab.1 b/grab.1
index 8ee5b28..8bd2e9e 100644
--- a/grab.1
+++ b/grab.1
@@ -15,6 +15,7 @@
 .Nm "git grab"
 .Op Fl nz
 .Ar pattern
+.Op Ar glob ...
 .Nm "git grab"
 .Fl h
 .Sh DESCRIPTION
@@ -39,10 +40,17 @@ The
 utility is identical to the
 .Nm
 utility in all ways except for two exceptions.
-The first is that files cannot be passed as command-line arguments,
-.Nm git-grab
-instead will read all the files specified by an invocation of
-.Xr git-ls-files 1 .
+The first is that if no files
+.Pq globs in this case to be precise
+are specified,
+input is not read from the standard-input but instead all files returned
+by an invocation of
+.Xr git-ls-files 1
+are processed.
+If the user provides one or more globs,
+only the files returned by
+.Xr git-ls-files 1
+that match one or more of the given globs will be processed.
 Secondly, the
 .Fl f
 option is not available;
@@ -156,6 +164,16 @@ List all your systems CPU flags, sorted and without duplicates:
 Search for a pattern in multiple files without printing filenames:
 .Pp
 .Dl $ cat file1 file2 file3 | grab 'x/pattern/'
+.Pp
+Search for usages of an
+.Ql <hb-form-text>
+Vue component —
+but only those which are being passed a
+.Ql placeholder
+property —
+searching all files in the current git-repository:
+.Pp
+.Dl $ git grab 'x/<hb-form-text[^>]+>/ g/\ebplaceholder\eb/' '*.vue'
 .Sh SEE ALSO
 .Xr git-ls-files 1 ,
 .Xr grep 1
diff --git a/grab.c b/grab.c
index 88a7a4a..96b5d9f 100644
--- a/grab.c
+++ b/grab.c
@@ -64,7 +64,7 @@ static regex_t mkregex(char *, size_t);
 static struct ops comppat(char *);
 static char *env_or_default(const char *, const char *);
 #if GIT_GRAB
-static FILE *getfstream(void);
+static FILE *getfstream(int n, char *v[n]);
 #endif
 
 static bool xisspace(char);
@@ -96,7 +96,7 @@ usage(const char *s)
 {
 	fprintf(stderr,
 #if GIT_GRAB
-	        "Usage: %s [-nz] pattern\n"
+	        "Usage: %s [-nz] pattern [glob ...]\n"
 #else
 	        "Usage: %s [-fnz] pattern [file ...]\n"
 #endif
@@ -164,7 +164,7 @@ main(int argc, char **argv)
 	ops = comppat(argv[0]);
 
 #if GIT_GRAB
-	if ((flist = getfstream()) == nullptr)
+	if ((flist = getfstream(argc - 1, argv + 1)) == nullptr)
 		die("getfstream");
 	while ((nr = getdelim(&entry, &len, '\0', flist)) > 0) {
 		FILE *fp;
@@ -425,7 +425,7 @@ mkregex(char *s, size_t n)
 
 #if GIT_GRAB
 FILE *
-getfstream(void)
+getfstream(int argc, char *argv[argc])
 {
 	pid_t pid;
 	int fds[2];
@@ -440,11 +440,24 @@ getfstream(void)
 	switch (pid = fork()) {
 	case -1:
 		die("fork");
-	case 0:
+	case 0:;
+		size_t len = argc + 5;
+		char **args;
+
 		close(fds[FD_R]);
 		if (dup2(fds[FD_W], STDOUT_FILENO) == -1)
 			die("dup2");
-		execlp("git", "git", "ls-files", "-z", nullptr);
+
+		if (!(args = malloc(len * sizeof(char *))))
+			die("malloc");
+		args[0] = "git";
+		args[1] = "ls-files";
+		args[2] = "-z";
+		args[3] = "--";
+		memcpy(args + 4, argv, argc * sizeof(char *));
+		args[len - 1] = nullptr;
+
+		execvp("git", args);
 		die("execvp: git ls-files -z");
 	}
 
-- 
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