Always use ?...? to indicate optional arguments in the output of ".help"

in the CLI.  Change ".mode column" so that it automatically activates
".headers on" if headers have not been previously turned on or off.

FossilOrigin-Name: 2827c0a186596299e43eb3e7378eea462d2b060b2c3388ce5cb2bc8e0b43999e

manifest

@@ -1,5 +1,5 @@
-C Add\ssupport\sfor\s"box"\smode\sin\sthe\sCLI:\s\sLike\s"table"\sexcept\sthat\sit\suses\nunicode\sbox-drawing\scharacters\sinstead\sof\sascii-art.
-D 2020-06-04T18:05:39.066
+C Always\suse\s?...?\sto\sindicate\soptional\sarguments\sin\sthe\soutput\sof\s".help"\nin\sthe\sCLI.\s\sChange\s".mode\scolumn"\sso\sthat\sit\sautomatically\sactivates\n".headers\son"\sif\sheaders\shave\snot\sbeen\spreviously\sturned\son\sor\soff.
+D 2020-06-05T00:54:27.575
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -534,7 +534,7 @@ F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c c2008519a0654f1e7490e9281ed0397d0f14bb840d81f0b96946248afcbdb25d
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
 F src/select.c 39a00a8bc89596dfb37c16afcbb1d33de5085b9963564b58aafe1566d08c0881
-F src/shell.c.in 6f7ea57d3f15e7e6a1f7049b6b7e39589dd5fe114e8de034ae9a68bf7722fd40
+F src/shell.c.in c6e26593f2738eefded08a39204bf6b48db135cdfaa458c26ffe57055b4fe365
 F src/sqlite.h.in 74342b41e9d68ff9e56b192009046f8dd0aa2bd76ce1a588f330de614ba61de7
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 2d1af80082edffd71c6f96f70ad1ce6a4fb46615ad10291fc77fe0dea9ff0197
@@ -1338,7 +1338,7 @@ F test/sharedA.test 49d87ec54ab640fbbc3786ee3c01de94aaa482a3a9f834ad3fe92770eb69
 F test/sharedB.test 16cc7178e20965d75278f410943109b77b2e645e
 F test/shared_err.test 32634e404a3317eeb94abc7a099c556a346fdb8fb3858dbe222a4cbb8926a939
 F test/sharedlock.test 5ede3c37439067c43b0198f580fd374ebf15d304
-F test/shell1.test fabf21eea2c6bb04dd86dfc7441c7c14841b25e2540c1fffeae815e718625bcc
+F test/shell1.test a1cf47c5e110560ff25a714570bfd53bfaceeb61db5cad3072a4064f17ebd10e
 F test/shell2.test e242a9912f44f4c23c3d1d802a83e934e84c853b
 F test/shell3.test ac8c2b744014c3e9a0e26bfd829ab65f00923dc1a91ffd044863e9423cc91494
 F test/shell4.test 1c6aef11daaa2d6830acaba3ac9cbec93fbc1c3d5530743a637f39b3987d08ce
@@ -1866,7 +1866,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 7efabd683b79743b407ad71dda56db00fb0d668828bdc342145816b4f1c3bf3a
-R 3dac6f750121e41150b03b7c089ed222
+P 6da784c9e174744d6deeb76c553b515b96c1fcb80c55a281e476959ec680fb72
+R 969ac1a40c6ff55758c13b258f83a246
 U drh
-Z e00f940b0330d0b11d881b13cbeefb56
+Z 0d6660a390bea97335acfad3a03d0eb7

manifest.uuid

@@ -1 +1 @@
-6da784c9e174744d6deeb76c553b515b96c1fcb80c55a281e476959ec680fb72
+2827c0a186596299e43eb3e7378eea462d2b060b2c3388ce5cb2bc8e0b43999e

src/shell.c.in

@@ -1167,6 +1167,7 @@ struct ShellState {
 #define SHFLG_Newlines       0x00000010 /* .dump --newline flag */
 #define SHFLG_CountChanges   0x00000020 /* .changes setting */
 #define SHFLG_Echo           0x00000040 /* .echo or --echo setting */
+#define SHFLG_HeaderSet      0x00000080 /* .header has been used */
 
 /*
 ** Macros for testing and setting shellFlgs
@@ -3930,7 +3931,7 @@ static const char *(azHelp[]) = {
   "       -e     Send output to the system text editor",
   "       -x     Send output as CSV to a spreadsheet (same as \".excel\")",
 #ifdef SQLITE_DEBUG
-  ".oom [--repeat M] [N]    Simulate an OOM error on the N-th allocation",
+  ".oom ?--repeat M? ?N?    Simulate an OOM error on the N-th allocation",
 #endif 
   ".open ?OPTIONS? ?FILE?   Close existing database and reopen FILE",
   "     Options:",
@@ -7969,6 +7970,7 @@ static int do_meta_command(char *zLine, ShellState *p){
   if( c=='h' && strncmp(azArg[0], "headers", n)==0 ){
     if( nArg==2 ){
       p->showHeader = booleanValue(azArg[1]);
+      p->shellFlgs |= SHFLG_HeaderSet;
     }else{
       raw_printf(stderr, "Usage: .headers on|off\n");
       rc = 1;
@@ -8491,6 +8493,9 @@ static int do_meta_command(char *zLine, ShellState *p){
       sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
     }else if( c2=='c' && strncmp(azArg[1],"columns",n2)==0 ){
       p->mode = MODE_Column;
+      if( (p->shellFlgs & SHFLG_HeaderSet)==0 ){
+        p->showHeader = 1;
+      }
       sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
     }else if( c2=='l' && n2>2 && strncmp(azArg[1],"list",n2)==0 ){
       p->mode = MODE_List;

test/shell1.test

@@ -709,11 +709,11 @@ do_test shell1-3.26.4 {
   # this should be treated the same as a '1' width for col 1 and 2
 } {0 {}}
 do_test shell1-3.26.5 {
-  catchcmd "test.db" ".mode column\n.width 10 -10\nSELECT 'abcdefg', 123456;"
+  catchcmd "test.db" ".mode column\n.header off\n.width 10 -10\nSELECT 'abcdefg', 123456;"
   # this should be treated the same as a '1' width for col 1 and 2
 } {0 {abcdefg         123456}}
 do_test shell1-3.26.6 {
-  catchcmd "test.db" ".mode column\n.width -10 10\nSELECT 'abcdefg', 123456;"
+  catchcmd "test.db" ".mode column\n.header off\n.width -10 10\nSELECT 'abcdefg', 123456;"
   # this should be treated the same as a '1' width for col 1 and 2
 } {0 {   abcdefg  123456    }}