# Description: Add git status column to detail mode. Provides additional
#              command line flag -G which will render the git status
#              column also in normal mode. nnn.vim users may consider
#              adding `let g:nnn#command = 'nnn -G' to their vim config.
#
# Authors: Luuk van Baal, @crides

diff --git a/src/nnn.c b/src/nnn.c
index fe5d650..059c7bf 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -277,6 +277,7 @@ typedef struct entry {
 	uid_t uid; /* 4 bytes */
 	gid_t gid; /* 4 bytes */
 #endif
+	char git_status[2];
 } *pEntry;

 /* Selection marker */
@@ -333,6 +334,7 @@ typedef struct {
 	uint_t cliopener  : 1;  /* All-CLI app opener */
 	uint_t waitedit   : 1;  /* For ops that can't be detached, used EDITOR */
 	uint_t rollover   : 1;  /* Roll over at edges */
+	uint_t normalgit  : 1;  /* Show git status in normal mode */
 } settings;

 /* Non-persistent program-internal states (alphabeical order) */
@@ -382,7 +384,17 @@ typedef struct {
 } session_header_t;
 #endif

+typedef struct {
+	char status[2];
+	char path[PATH_MAX];
+} git_status_t;
+
 /* GLOBALS */
+struct {
+	bool show;
+	size_t len;
+	git_status_t *statuses;
+} git_statuses;

 /* Configuration, contexts */
 static settings cfg = {
@@ -413,6 +425,7 @@ static settings cfg = {
 	0, /* cliopener */
 	0, /* waitedit */
 	1, /* rollover */
+	0, /* normalgit */
 };

 static context g_ctx[CTX_MAX] __attribute__ ((aligned));
@@ -3781,6 +3794,39 @@ static char *get_kv_val(kv *kvarr, char *buf, int key, uchar_t max, uchar_t id)
 	return NULL;
 }

+static size_t get_git_statuses(const char *path)
+{
+	static char gitrev[] = "git rev-parse --show-toplevel 2>/dev/null";
+	char workdir[PATH_MAX];
+	FILE *fp = popen(gitrev, "r");
+
+	fgets(workdir, PATH_MAX, fp);
+	pclose(fp);
+
+	if (!workdir[0])
+		return 0;
+
+	static char gitstat[] = "git -c core.quotePath= status --porcelain --ignored=matching -u ";
+	char pathspec[PATH_MAX], status[PATH_MAX];
+	size_t i = -1;
+	git_statuses.show = FALSE;
+	workdir[xstrlen(workdir) - 1] = '\0';
+	snprintf(pathspec, PATH_MAX, "%s%s%s 2>/dev/null", gitstat, path, cfg.showhidden ? "" : "/*");
+	fp = popen(pathspec, "r");
+
+	while (fgets(status, PATH_MAX, fp)) {
+		size_t pathindex = (status[3] == '"') ? 4 : 3;
+		status[xstrlen(status) - pathindex + 2] = '\0';
+		git_statuses.statuses = xrealloc(git_statuses.statuses, sizeof(git_status_t) * (++i + 1));
+		git_statuses.statuses[i].status[0] = (status[0] == ' ') ? '-' : status[0];
+		git_statuses.statuses[i].status[1] = (status[1] == ' ') ? '-' : status[1];
+		mkpath(workdir, status + pathindex, git_statuses.statuses[i].path);
+	}
+
+	pclose(fp);
+	return (i + 1);
+}
+
 static void resetdircolor(int flags)
 {
 	/* Directories are always shown on top, clear the color when moving to first file */
@@ -4118,6 +4164,10 @@ static void printent(const struct entry *ent, uint_t namecols, bool sel)

 	uchar_t color_pair = get_color_pair_name_ind(ent, &ind, &attrs);

+	if (git_statuses.show && (cfg.showdetail || cfg.normalgit))
+		printw("%*s%c%c", (cfg.normalgit && !cfg.showdetail) ? 1 : 0, "",
+				ent->git_status[0], ent->git_status[1]);
+
 	addch((ent->flags & FILE_SELECTED) ? '+' | A_REVERSE | A_BOLD : ' ');

 	if (g_state.oldcolor)
@@ -5451,6 +5501,10 @@ static int dentfill(char *path, struct entry **ppdents)
 		attron(COLOR_PAIR(cfg.curctx + 1));
 	}

+	char linkpath[PATH_MAX];
+	if ((git_statuses.len = get_git_statuses(path)))
+		realpath(path, linkpath);
+
 #if _POSIX_C_SOURCE >= 200112L
 	posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL);
 #endif
@@ -5649,6 +5703,34 @@ static int dentfill(char *path, struct entry **ppdents)
 #endif
 		}

+		if (git_statuses.len) {
+			char dentpath[PATH_MAX];
+			size_t pathlen = mkpath(linkpath, dentp->name, dentpath) - 1;
+			dentp->git_status[0] = dentp->git_status[1] = '-';
+
+			if (dentp->flags & DIR_OR_DIRLNK) {
+				for (size_t i = 0; i < git_statuses.len; ++i)
+					if (is_prefix(git_statuses.statuses[i].path, dentpath, pathlen)) {
+						dentp->git_status[0] = git_statuses.statuses[i].status[0];
+						dentp->git_status[1] = git_statuses.statuses[i].status[1];
+						if (dentp->git_status[1] != '!') {
+							git_statuses.show = TRUE;
+							if (dentp->git_status[1] == '?')
+								break;
+						}
+					}
+			} else {
+				for (size_t i = 0; i < git_statuses.len; ++i)
+					if (!xstrcmp(git_statuses.statuses[i].path, dentpath)) {
+						dentp->git_status[0] = git_statuses.statuses[i].status[0];
+						dentp->git_status[1] = git_statuses.statuses[i].status[1];
+						if (dentp->git_status[1] != '!')
+							git_statuses.show = TRUE;
+						break;
+					}
+			}
+		}
+
 		++ndents;
 	} while ((dp = readdir(dirp)));

@@ -6160,11 +6242,12 @@ static int adjust_cols(int n)
 #endif
 	if (cfg.showdetail) {
 		/* Fallback to light mode if less than 35 columns */
-		if (n < 36)
+		if (n < 38)
 			cfg.showdetail ^= 1;
 		else /* 2 more accounted for below */
-			n -= 32;
-	}
+			n -= (git_statuses.show ? 34 : 32);
+	} else if (cfg.normalgit && git_statuses.show)
+		n -= 3;

 	/* 2 columns for preceding space and indicator */
 	return (n - 2);
@@ -7913,6 +7996,7 @@ static void usage(void)
 		" -F val  fifo mode [0:preview 1:explore]\n"
 #endif
 		" -g      regex filters\n"
+		" -G      always show git status\n"
 		" -H      show hidden files\n"
 		" -J      no auto-proceed on select\n"
 		" -K      detect key collision\n"
@@ -8051,6 +8135,7 @@ static void cleanup(void)
 		fflush(stdout);
 	}
 #endif
+	free(git_statuses.statuses);
 	free(selpath);
 	free(plgpath);
 	free(cfgpath);
@@ -8095,7 +8180,7 @@ int main(int argc, char *argv[])

 	while ((opt = (env_opts_id > 0
 		       ? env_opts[--env_opts_id]
-		       : getopt(argc, argv, "aAb:cCdDeEfF:gHJKl:nop:P:QrRs:St:T:uUVwxh"))) != -1) {
+		       : getopt(argc, argv, "aAb:cCdDeEfF:gGHJKl:nop:P:QrRs:St:T:uUVwxh"))) != -1) {
 		switch (opt) {
 #ifndef NOFIFO
 		case 'a':
@@ -8146,6 +8231,9 @@ int main(int argc, char *argv[])
 			cfg.regex = 1;
 			filterfn = &visible_re;
 			break;
+		case 'G':
+			cfg.normalgit = 1;
+			break;
 		case 'H':
 			cfg.showhidden = 1;
 			break;