find: add -true/-false.

Used near the end of the AOSP build. Almost there!

(This patch also fiddles with the help text to be able to slip the new
options in without requiring so much extra space.)

1 files changed, 24 insertions, 19 deletions

diff --git a/toys/posix/find.c b/toys/posix/find.c
index fe712c88..5fc9b0ce 100644
--- a/toys/posix/find.c
+++ b/toys/posix/find.c
@@ -17,24 +17,25 @@ config FIND
     usage: find [-HL] [DIR...] [<options>]
 
     Search directories for matching files.
-    Default: search "." match all -print all matches.
+    Default: search ".", match all, -print matches.
 
     -H  Follow command line symlinks         -L  Follow all symlinks
 
     Match filters:
-    -name  PATTERN  filename with wildcards   -iname      case insensitive -name
-    -path  PATTERN  path name with wildcards  -ipath      case insensitive -path
-    -user  UNAME    belongs to user UNAME     -nouser     user ID not known
-    -group GROUP    belongs to group GROUP    -nogroup    group ID not known
-    -perm  [-/]MODE permissions (-=min /=any) -prune      ignore contents of dir
-    -size  N[c]     512 byte blocks (c=bytes) -xdev       only this filesystem
-    -links N        hardlink count            -atime N[u] accessed N units ago
-    -ctime N[u]     created N units ago       -mtime N[u] modified N units ago
-    -newer FILE     newer mtime than FILE     -mindepth # at least # dirs down
-    -depth          ignore contents of dir    -maxdepth # at most # dirs down
-    -inum  N        inode number N            -empty      empty files and dirs
-    -type [bcdflps]   (block, char, dir, file, symlink, pipe, socket)
-    -context PATTERN  security context
+    -name  PATTERN   filename with wildcards  (-iname case insensitive)
+    -path  PATTERN   path name with wildcards (-ipath case insensitive)
+    -user  UNAME     belongs to user UNAME     -nouser     user ID not known
+    -group GROUP     belongs to group GROUP    -nogroup    group ID not known
+    -perm  [-/]MODE  permissions (-=min /=any) -prune      ignore dir contents
+    -size  N[c]      512 byte blocks (c=bytes) -xdev       only this filesystem
+    -links N         hardlink count            -atime N[u] accessed N units ago
+    -ctime N[u]      created N units ago       -mtime N[u] modified N units ago
+    -newer FILE      newer mtime than FILE     -mindepth N at least N dirs down
+    -depth           ignore contents of dir    -maxdepth N at most N dirs down
+    -inum N          inode number N            -empty      empty files and dirs
+    -type [bcdflps]  type is (block, char, dir, file, symlink, pipe, socket)
+    -true            always true               -false      always false
+    -context PATTERN security context
 
     Numbers N may be prefixed by a - (less than) or + (greater than). Units for
     -Xtime are d (days, default), h (hours), m (minutes), or s (seconds).
@@ -43,11 +44,10 @@ config FIND
     !, -a, -o, ( )    not, and, or, group expressions
 
     Actions:
-    -print   Print match with newline  -print0    Print match with null
-    -exec    Run command with path     -execdir   Run command in file's dir
-    -ok      Ask before exec           -okdir     Ask before execdir
-    -delete         Remove matching file/dir
-    -printf FORMAT  Print using format string
+    -print  Print match with newline  -print0        Print match with null
+    -exec   Run command with path     -execdir       Run command in file's dir
+    -ok     Ask before exec           -okdir         Ask before execdir
+    -delete Remove matching file/dir  -printf FORMAT Print using format string
 
     Commands substitute "{}" with matched file. End with ";" to run each file,
     or "+" (next argument after "{}") to collect and run with multiple files.
@@ -305,6 +305,11 @@ static int do_find(struct dirtree *new)
     } else if (!strcmp(s, "not")) {
       if (check) not = !not;
       continue;
+    } else if (!strcmp(s, "true")) {
+      if (check) test = 1;
+    } else if (!strcmp(s, "false")) {
+      if (check) test = 0;
+
     // Mostly ignore NOP argument
     } else if (!strcmp(s, "a") || !strcmp(s, "and") || !strcmp(s, "noleaf")) {
       if (not) goto error;